US Bank PSA

7/30/2019 US Bank PSA

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Credit Suisse First Boston Mortgage Securities Corp.11 Madison Avenue, 4th FloorNew York, New York 10010Attention: Peter Sack

Wells Fargo Bank, N.A.,as Trust Administrator for the[Name of Series Trust]9062 Old Annapolis Road,Columbia, MD 21045

Re: [__________________] Mortgage-Backed Pass-ThroughCertificates, Series 200 - (the

"Certificates")

Ladies and Gentlemen:

In connection with our acquisition of the aboveCertificates we certify that (a) we understandthat the Certificates are not being registered under the Securities Act of

1933, as amended (the "Act"), or anystate securities laws and are being transferred to us in a transactionthat is exempt from the registrationrequirements of the Act and any such laws, (b) we have such knowledge andexperience in financial and businessmatters that we are capable of evaluating the merits and risks ofinvestments in the Certificates, (c) we havehad the opportunity to ask questions of and receive answers from theDepositor concerning the purchase of theCertificates and all matters relating thereto or any additionalinformation deemed necessary to our decision topurchase the Certificates, (d) either (i) we are not an employee benefitplan or arrangement that is subject tothe Employee Retirement Income Security Act of 1974, as amended, orSection 4975 of the Internal Revenue Code of1986, as amended, nor are we using the assets of any such plan orarrangement, (ii) we are providing an Opinionof Counsel which establishes to the reasonable satisfaction of the TrustAdministrator that the purchase andholding of ERISA-Restricted Certificates by, on behalf of or with "planassets" of such plan will not result in anon-exempt prohibited transaction under Section 406 of ERISA or Section4975 of the Code, and will not subjectthe Depositor, the Trustee, the Trust Administrator, the Master Serviceror any other Servicer to any obligationin addition to those undertaken in this Agreement or (iii) if, in the caseof an ERISA-Restricted Certificatesthat have been the subject of an ERISA-Qualifying Underwriting, we are aninsurance company, we are purchasingsuch Certificates with funds contained in an "insurance company generalaccount" (as such term is defined inSection V(e) of Prohibited Transaction Class Exemption 95-60 ("PTCE 95-60")) and our purchase and holding of suchCertificates are covered under Sections I and III of PTCE 95-60, (e) wehave not, nor has anyone acting on ourbehalf offered, transferred, pledged, sold or otherwise disposed ofthe Certificates, any interest in the


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Certificates or any other similar security to, or solicited any offerto buy or accept a transfer, pledge orother disposition of the Certificates, any interest in the Certificatesor any other similar security from, orotherwise approached or negotiated with respect to the Certificates, anyinterest in the Certificates or anyother similar security with, any person in any manner, or made anygeneral solicitation by means of generaladvertising or in any other manner, or taken any other action, thatwould constitute a distribution of theCertificates under the Act or that would render the disposition of theCertificates a violation of Section 5 ofthe Act or require registration pursuant thereto, nor will act, nor hasauthorized or will authorize any personto act, in such manner with respect to the Certificates, (f) we are not a"U.S. person" within the meaning ofRegulation S under the Act (a "Non-U.S. Person"), (g) we are aware thatthe sale to us is being made in relianceon Regulation S, and (h) we are acquiring the Certificates for our ownaccount or for resale pursuant to

Regulation S under the Act and further, understand that such Certificatesmay be resold, pledged or transferredonly (A) to a person reasonably believed to be a qualified institutionalbuyer that purchases for its own accountor for the account of a qualified institutional buyer to whom notice isgiven that the resale, pledge or transferis being made in reliance on Rule 144A, (B) to a Non-U.S. Person inaccordance with Regulation S under the Act or(C) pursuant to another exemption from registration under the Act.

Very truly yours,

[Print Name ofTransferee]

By:_____________________________________

Name:Title:

EXHIBIT N

FORM OF TRANSFEREE AFFIDAVIT AND AGREEMENT

STATE OF ): ss.:

COUNTY OF )

[NAME OF OFFICER], being first duly sworn, deposes and says:

1. That he is [Title of Officer] or [Name of Owner](record or beneficial owner (the"Owner") of the Class [AR/AR-L] Certificates (the "Class [AR/AR-L]Certificates")), a [savings institution]


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[corporation] duly organized and existing under the laws of [theState of ] [the United States], onbehalf of which he makes this affidavit and agreement.

2. That the Owner (i) is not and will not be a"disqualified organization" as of [date oftransfer] within the meaning of Section 860E(e)(5) of the Internal RevenueCode of 1986, as amended (the "Code"),(ii) will endeavor to remain other than a disqualified organization forso long as it retains its ownershipinterest in the Class [AR/AR-L] Certificates, and (iii) is acquiring theClass [AR/AR-L] Certificates for its ownaccount. A "Permitted Transferee" is any person other than a "disqualifiedorganization." (For this purpose, a"disqualified organization" means the United States, any state or politicalsubdivision thereof, any agency orinstrumentality of any of the foregoing (other than an instrumentality allof the activities of which are subjectto tax and, except for the Federal Home Loan Mortgage Corporation, amajority of whose board of directors is not

selected by any such governmental entity) or any foreign government,international organization or any agency orinstrumentality of such foreign government or organization, any ruralelectric or telephone cooperative, or anyorganization (other than certain farmers' cooperatives) that is generallyexempt from federal income tax unlesssuch organization is subject to the tax on unrelated business taxable income).

3. That the Owner is aware (i) of the tax thatwould be imposed on transfers of Class[AR/AR-L] Certificates to disqualified organizations under the Code;(ii) that such tax would be on thetransferor, or, if such transfer is through an agent (which person includesa broker, nominee or middleman) for anon-Permitted Transferee, on the agent; (iii) that the person otherwiseliable for the tax shall be relieved ofliability for the tax if the transferee furnishes to such person anaffidavit that the transferee is a PermittedTransferee and, at the time of transfer, such person does not have actualknowledge that the affidavit is false;and (iv) that the Class [AR/AR-L] Certificates may be "noneconomicresidual interests" within the meaning ofTreasury regulations promulgated pursuant to the Code and that thetransferor of a noneconomic residual interestwill remain liable for any taxes due with respect to the income on suchresidual interest, if a significantpurpose of the transfer was to enable the transferor to impede the assessmentor collection of tax.

4. That the Owner is aware of the tax imposed on a"pass-through entity" holding Class[AR/AR-L] Certificates if at any time during the taxable year of thepass-through entity a non-PermittedTransferee is the record holder of an interest in such entity. (Forthis purpose, a "pass through entity"includes a regulated investment company, a real estate investment trustor common trust fund, a partnership,


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trust or estate, and certain cooperatives.)

5. That the Owner is aware that the TrustAdministrator will not register the Transfer ofany Class [AR/AR-L] Certificates unless the transferee, or thetransferee's agent, delivers to it an affidavitand agreement, among other things, in substantially the same form as thisaffidavit and agreement. The Ownerexpressly agrees that it will not consummate any such transfer if itknows or believes that any of therepresentations contained in such affidavit and agreement are false.

6. That the Owner has reviewed therestrictions set forth on the face of theClass [AR/AR-L] Certificates and the provisions of Section 6.02 ofthe Series Supplement dated as of___________________ and the Standard Terms of Pooling and ServicingAgreement dated May 1, 2007 (collectively,the "Agreement") by and among the Depositor, the Seller(s), the MasterServicer, the Trust Administrator, the

Special Servicer, the Modification Oversight Agent, the Trustee and theServicers that are party to the SeriesSupplement, under which the Class [AR/AR-L] Certificates were issued. TheOwner expressly agrees to be bound byand to comply with such restrictions and provisions.

7. That the Owner consents to any additionalrestrictions or arrangements that shall bedeemed necessary upon advice of counsel to constitute a reasonablearrangement to ensure that the Class [AR/AR-L]Certificates will only be owned, directly or indirectly, by an Owner that isa Permitted Transferee.

8. That the Owner's Taxpayer Identification Number is________________.

9. That the Owner is a citizen or resident ofthe United States, a corporation,partnership or other entity created or organized in, or under the laws of,the United States, any State thereofor the District of Columbia, or an estate or trust whose income fromsources without the United States isincludable in gross income for United States federal income tax purposesregardless of its connection with theconduct of a trade or business within the United States.

10. That no purpose of the Owner relating tothe purchase of the Class [AR/AR-L]Certificate by the Owner is or will be to impede the assessment or collectionof tax.

11. That the Owner has no present knowledge orexpectation that it will be unable to payany United States taxes owed by it so long as any of the Certificates remainoutstanding.


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12. That the Owner has no present knowledge orexpectation that it will become insolventor subject to a bankruptcy proceeding for so long as any of the Certificatesremain outstanding.

13. That no purpose of the Owner relating to anysale of the Class [AR/AR-L] Certificateby the Owner will be to impede the assessment or collection of tax.

14. The Owner hereby agrees to cooperate with theTrustee and to take any action requiredof it by the Code or Treasury regulations thereunder (whether now orhereafter promulgated) in order to create ormaintain the REMIC status of the Trust Fund.

15. That the Owner is not an employee benefit orother plan subject to the prohibitedtransaction provisions of the Employee Retirement Income Security Actof 1974, as amended ("ERISA"), orSection 4975 of the Internal Revenue Code of 1986, as amended (the

"Code") (a "Plan"), or any other person(including an investment manager, a named fiduciary or a trustee of anyPlan) acting, directly or indirectly, onbehalf of or purchasing any Certificate with "plan assets" of any Plan.

16. The Owner hereby agrees that it will not take anyaction that could endanger the REMICstatus of the Trust Fund or result in the imposition of tax on the TrustFund unless counsel for, or acceptableto, the Trustee and the Trust Administrator has provided an opinion thatsuch action will not result in the lossof such REMIC status or the imposition of such tax, as applicable.

17. The Owner has provided financial statements orother financial information requestedby the transferor in connection with the transfer of the ResidualCertificates to permit the transferor to assessthe financial capability of the Owner to pay any such taxes.

IN WITNESS WHEREOF, the Owner has caused this instrumentto be executed on its behalf, pursuantto the authority of its Board of Directors, by its [Title of Officer]and its corporate seal to be hereuntoattached, attested by its [Assistant] Secretary, this ____ day of ___________.

[NAME OF OWNER]

By:__________________________________________

[Name of Officer][Title of Officer]

[Corporate Seal]

ATTEST:

__________________________________________


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[Assistant] Secretary

Personally appeared before me the above-named [Name ofOfficer], known or proved to me to bethe same person who executed the foregoing instrument and to be the[Title of Officer] of the Owner, andacknowledged to me that he executed the same as his free act and deed and thefree act and deed of the Owner.

Subscribed and sworn before me this _____ day of _______________________.

_____________________________________________

NOTARY PUBLIC

COUNTY OF___________________________________

STATE OF____________________________________

My Commission expiresthe _____ day of __________________,

20____.

EXHIBIT O

FORM OF TRANSFER CERTIFICATE

[date]

Credit Suisse First Boston Mortgage Securities Corp.11 Madison Avenue, 4th FloorNew York, New York 10010Attention: Peter Sack

Wells Fargo Bank, N.A.,as Trust Administrator for the[Name of Series Trust]9062 Old Annapolis Road,Columbia, MD 21045

Re: [_________________________] Mortgage Backed PassThrough Certificates, Series 200_

___, Class AR (the "Certificates")


This letter is delivered to you in connection with the saleby _________________ (the "Seller")to ____________________________________ (the "Purchaser") of a _______%Percentage Interest in the abovereferenced Certificates, pursuant to Section 6.02 of the Series Supplementdated as of ___________________ and


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the Standard Terms of Pooling and Servicing Agreement dated May 1, 2007(collectively, the "Agreement") by andamong the Depositor, the Seller(s), the Master Servicer, the TrustAdministrator, the Special Servicer, theModification Oversight Agent, the Trustee and the Servicers that are partyto the Series Supplement. All termsused herein and not otherwise defined shall have the meanings set forthin the Agreement. The Seller herebycertifies, represents and warrants to, and covenants with, the Depositor,the Trust Administrator and the Trusteethat:

1. No purpose of the Seller relating to sale ofthe Certificate by the Seller to thePurchaser is or will be to enable the Seller to impede the assessment orcollection of any tax.

2. The Seller understands that the Purchaser hasdelivered to the Trust Administrator atransfer affidavit and agreement in the form attached to the Agreement as

Exhibit N. The Seller does not know orbelieve that any representation contained therein is false.

3. The Seller has no actual knowledge that theproposed Transferee is not a PermittedTransferee.

4. The Seller has no actual knowledge that thePurchaser would be unwilling or unable topay taxes due on its share of the taxable income attributable to theCertificate.

5. The Seller has conducted a reasonableinvestigation of the financial condition of thePurchaser and, as a result of the investigation, found that the Purchaserhas historically paid its debts as theycame due, and found no significant evidence to indicate that the Purchaserwill not continue to pay its debts asthey come due in the future.

6. The Purchaser has represented to the Sellerthat, if the Certificate constitutes anoneconomic residual interest, it (i) understands that as holder of anoneconomic residual interest it may incurtax liabilities in excess of any cash flows generated by the interest, and(ii) intends to pay taxes associatedwith its holding of the Certificate as they become due.

Very truly yours,

[SELLER]

By:_____________________________________

Name:Title:


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EXHIBIT P

FORM OF SPS MORTGAGE LOANS REPORT

DATA AND FORMAT TO BE PROVIDED BY SPS TO THEMASTER SERVICER

(in Excel format)

ALL SPS MORTGAGE LOANS

FIELD FORMATFIELDName*TextLien Position *Text/NumberFICO Score*NumberOriginal Occupancy*TextDocumentation*TextPurpose*TextOriginal Loan Amount*NumberOriginal Appraisal Value*NumberOriginal LTV*NumberOriginal P&I*

NumberOriginal Interest Rate*NumberFirst Payment Date*MM/DD/YYOrigination Date*MM/DD/YYOriginator*TextLoan Term*NumberProduct Type (adjustable rate or fixed rate)*TextProperty Type*TextStreet Address*TextCity*TextZip Code*TextState*Text


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MI Certificate Number*NumberPrepayment FlagTextPrepayment Expiration DateMM/DD/YYLoan NumberTextDeal Identifier by LoanTextCurrent Loan AmountNumberCurrent LTVNumberCurrent Interest RateNumberLast Interest Payment DateMM/DD/YYCurrent P&I Payment AmountNumber

Paid Off CodeTextScheduled BalanceNumberCalculation of Retained Yield by Loan Number (if applicable to thetransaction) NumberReporting of Delinquency Status on Defaulted Mortgage LoansTextCurrent Market ValueNumberDate of Market ValueMM/DD/YYAs-is ValueNumberRepaired ValueNumberType of ValuationTextForeclosure FlagTextBankruptcy FlagTextDate NOD sent to MI companyMM/DD/YYForeclosure Start Date (Referral Date)MM/DD/YYScheduled Foreclosure Sale DateMM/DD/YYForeclosure Actual Sale DateMM/DD/YYActual Notice of Intent DateMM/DD/YYActual First Legal DateMM/DD/YYBankruptcy ChapterNumber


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Actual Bankruptcy Start DateMM/DD/YYActual Payment Plan Start and End DatesMM/DD/YYList DateMM/DD/YYList PriceNumberVacancy/Occupancy StatusTextActual Eviction Start DateMM/DD/YYActual Eviction Completion DateMM/DD/YYActual REO Start DateMM/DD/YYSales PriceNumberActual Closing DateMM/DD/YY

Net Sales ProceedsNumberMortgage Insurance Claim Filing DateMM/DD/YYMortgage Insurance Proceeds ReceivedNumberDate Mortgage Insurance Proceeds ReceivedMM/DD/YYCollection History

EXHIBIT Q

FORM OF SPS FORECLOSURE SETTLEMENTSTATEMENT

REMIC #Ending Interest Rate:Original Amount of Loan:Fixed or Adjustable:UPB Accrued Int to frcl sale:Advanced Delinquent Interest:Date Borrower Paid To: / /Borrower's Name:Property Address:

MSP Bank/CategoryNote Date: / /Date of REO: / /Disposition Date: / /

AmountDate of Valuation Type of ValuationMarket Value AS IS:/ /


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RepairedSupplemental Value AS IS:/ /

RepairedREO BPO Value:/ /List Price:Sales Price:

ProceedsExpenses*List Price:Servicing Advances:Sales Price: 0.00Payee 70R01 Acquisition:Broker's Commission:Payee 75R60 REO:Bonus Commission:Payee 75R49 Foreclosure:Lien Purchase/Paid Off:

Payee 75R36 Escrow:Seller Closing Costs:Payee 75R52 Bankruptcy:Repair Costs:Discrepancy Amount:Seller Concessions:Servicing Advance Total: 0.00Other Closing Costs:Advances Applied After Liquidation: Prior Additional Advances:Net Proceeds: 0.00Escrow Advance: Interest on Advances:Escrow Balance:Other Advances:Suspense Balance:Servicing Advance Holdbacks:Restricted Escrow:Property Inspection:Rental Income Received:BPO:Insurance Settlement Received:Lender Placed Insurance:Other:Utilities: REO Repair Costs:Total Liquidation Proceeds: 0.00Foreclosure Fees:Total Liquidation Expenses: 0.00Bankruptcy:Net Liquidation Proceeds: 0.00Eviction Costs:Loan Principal Balance:Transfer Tax:


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Realized Gain/Loss Amount: 0.00Reconveyance Fees:Additional Proceeds Applied:Demand Fee:Prior Additional Proceeds:Total Holdbacks: 0.00Loss Severity: #DIV/0!Other Fees (Including Fee Code B):Notes:UPB Accrued Interest to COE: 0.00 Advanced Delinquent Interest: 0.00 Stopped Delinquent Interest: Deferred Interest: Additional Interest: Total Liquidation Expenses: 0.00

______________* All amounts will be itemized, and to the extent not itemized, this formwill be accompanied by documentation supporting

all amounts claimed on this form.

EXHIBIT R

RELEVANT SERVICING CRITERIA

The assessment of compliance to be delivered by the MasterServicer and the Trust Administrator shall

address, at a minimum, the criteria identified as below as "ApplicableServicing Criteria" with respect to suchparty:

Where there are multiple checks for criteria the attesting party willidentify in their management assertion thatthey are attesting only to the portion of the distribution chain theyare responsible for in the relatedtransaction agreements.

__________________________________________________________________________________________________________________________________________________________Regulation AB Reference Servicing CriteriaServicers Master Servicer Trust Administrator__________________________________________________________________________________________________________________________________________________________

General Servicing Considerations__________________________________________________________________________________________________________________________________________________________1122(d)(1)(i) Policies and procedures are instituted tomonitor X X X

any performance or other triggers and events ofdefault in accordance with the transaction


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agreements.__________________________________________________________________________________________________________________________________________________________1122(d)(1)(ii) If any material servicing activities are outsourcedX X

to third parties, policies and procedures areinstituted to monitor the third party's performanceand compliance with such servicing activities.

__________________________________________________________________________________________________________________________________________________________1122(d)(1)(iii) Any requirements in the transaction agreements to

maintain a back-up servicer for the Pool Assets aremaintained.

__________________________________________________________________________________________________________________________________________________________1122(d)(1)(iv) A fidelity bond and errors and omissions policy isX X

in effect on the party participating in theservicing function throughout the reporting periodin the amount of coverage required by and otherwise

in accordance with the terms of the transactionagreements.

__________________________________________________________________________________________________________________________________________________________

Cash Collection and Administration__________________________________________________________________________________________________________________________________________________________1122(d)(2)(i) Payments on pool assets are deposited into theX X X

appropriate custodial bank accounts and related bankclearing accounts no more than two business daysfollowing receipt, or such other number of daysspecified in the transaction agreements.

__________________________________________________________________________________________________________________________________________________________1122(d)(2)(ii) Disbursements made via wire transfer on behalf of anX X X

obligor or to an investor are made only byauthorized personnel.

__________________________________________________________________________________________________________________________________________________________1122(d)(2)(iii) Advances of funds or guarantees regardingX X

collections, cash flows or distributions, and anyinterest or other fees charged for such advances,are made, reviewed and approved as specified in thetransaction agreements.

__________________________________________________________________________________________________________________________________________________________1122(d)(2)(iv) The related accounts for the transaction, such asX X X

cash reserve accounts or accounts established as aform of over collateralization, are separatelymaintained (e.g., with respect to commingling ofcash) as set forth in the transaction agreements.

__________________________________________________________________________________________________________________________________________________________


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1122(d)(2)(v) Each custodial account is maintained at a federallyX X X

insured depository institution as set forth in thetransaction agreements. For purposes of thiscriterion, "federally insured depositoryinstitution" with respect to a foreign financialinstitution means a foreign financial institutionthat meets the requirements of Rule 13k-1(b)(1) ofthe Securities Exchange Act.

__________________________________________________________________________________________________________________________________________________________1122(d)(2)(vi) Unissued checks are safeguarded so as to preventX

unauthorized access.__________________________________________________________________________________________________________________________________________________________1122(d)(2)(vii) Reconciliations are prepared on a monthly basis forX X X

all asset-backed securities related bank accounts,including custodial accounts and related bank

clearing accounts. These reconciliations are (A)mathematically accurate; (B) prepared within 30calendar days after the bank statement cutoff date,or such other number of days specified in thetransaction agreements; (C) reviewed and approved bysomeone other than the person who prepared thereconciliation; and (D) contain explanations forreconciling items. These reconciling items areresolved within 90 calendar days of their originalidentification, or such other number of daysspecified in the transaction agreements.

__________________________________________________________________________________________________________________________________________________________

Investor Remittances and Reporting__________________________________________________________________________________________________________________________________________________________1122(d)(3)(i) Reports to investors, including those to be filedX X X

with the Commission, are maintained in accordancewith the transaction agreements and applicableCommission requirements. Specifically, such reports(A) are prepared in accordance with timeframes andother terms set forth in the transaction agreements;(B) provide information calculated in accordancewith the terms specified in the transactionagreements; (C) are filed with the Commission asrequired by its rules and regulations; and (D) agreewith investors' or the trustee's records as to thetotal unpaid principal balance and number of PoolAssets serviced by the Servicer.

__________________________________________________________________________________________________________________________________________________________1122(d)(3)(ii) Amounts due to investors are allocated and remittedX X X

in accordance with timeframes, distribution priorityand other terms set forth in the transactionagreements.


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__________________________________________________________________________________________________________________________________________________________1122(d)(3)(iii) Disbursements made to an investor are posted withinX X X

two business days to the Servicer's investorrecords, or such other number of days specified inthe transaction agreements.

__________________________________________________________________________________________________________________________________________________________1122(d)(3)(iv) Amounts remitted to investors per the investorX X X

reports agree with cancelled checks, or other formof payment, or custodial bank statements.

__________________________________________________________________________________________________________________________________________________________

Pool Asset Administration__________________________________________________________________________________________________________________________________________________________1122(d)(4)(i) Collateral or security on pool assets is maintainedX

as required by the transaction agreements or relatedpool asset documents.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(ii) Pool assets and related documents are safeguardedX

as required by the transaction agreements__________________________________________________________________________________________________________________________________________________________1122(d)(4)(iii) Any additions, removals or substitutions to theX

asset pool are made, reviewed and approved inaccordance with any conditions or requirements inthe transaction agreements.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(iv) Payments on pool assets, including any payoffs, madeX

in accordance with the related pool asset documentsare posted to the Servicer's obligor recordsmaintained no more than two business days afterreceipt, or such other number of days specified inthe transaction agreements, and allocated toprincipal, interest or other items (e.g., escrow) inaccordance with the related pool asset documents.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(v) The Servicer's records regarding the pool assetsX

agree with the Servicer's records with respect to anobligor's unpaid principal balance.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(vi) Changes with respect to the terms or status of anX

obligor's pool assets (e.g., loan modifications orre-agings) are made, reviewed and approved by


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authorized personnel in accordance with thetransaction agreements and related pool assetdocuments.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(vii) Loss mitigation or recovery actions (e.g.,X

forbearance plans, modifications and deeds in lieuof foreclosure, foreclosures and repossessions, asapplicable) are initiated, conducted and concludedin accordance with the timeframes or otherrequirements established by the transactionagreements.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(viii) Records documenting collection efforts areX

maintained during the period a pool asset isdelinquent in accordance with the transactionagreements. Such records are maintained on at least

a monthly basis, or such other period specified inthe transaction agreements, and describe theentity's activities in monitoring delinquent poolassets including, for example, phone calls, lettersand payment rescheduling plans in cases wheredelinquency is deemed temporary (e.g., illness orunemployment).

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(ix) Adjustments to interest rates or rates of return forX

pool assets with variable rates are computed basedon the related pool asset documents.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(x) Regarding any funds held in trust for an obligorX

(such as escrow accounts): (A) such funds areanalyzed, in accordance with the obligor's poolasset documents, on at least an annual basis, orsuch other period specified in the transactionagreements; (B) interest on such funds is paid, orcredited, to obligors in accordance with applicablepool asset documents and state laws; and (C) suchfunds are returned to the obligor within 30 calendardays of full repayment of the related pool assets,or such other number of days specified in thetransaction agreements.

__________________________________________________________________________________________________________________________________________________________1122(d)(4)(xi) Payments made on behalf of an obligor (such as taxX

or insurance payments) are made on or before therelated penalty or expiration dates, as indicated onthe appropriate bills or notices for such payments,provided that such support has been received by theservicer at least 30 calendar days prior to these


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__________________________________________________________________________________________________________________________________________________________

Item 1: Distribution and Pool Performance Information__________________________________________________________________________________________________________________________________________________________Information included in the [Monthly Statement]Servicer Master Servicer Trust Administrator__________________________________________________________________________________________________________________________________________________________Any information required by 1121 which is NOT included on the [MonthlyDepositorStatement]__________________________________________________________________________________________________________________________________________________________

Item 2: Legal ProceedingsAny legal proceeding pending against the following entities or their

respective property, that is material to Certificateholders, including anyproceeding sknown to be contemplated by governmental authorities:__________________________________________________________________________________________________________________________________________________________o Issuing Entity (Trust Fund)Trustee, Master Servicer, Trust Administrator and Depositor__________________________________________________________________________________________________________________________________________________________o Sponsor (Seller)Seller (if a party to the Agreement) or Depositor__________________________________________________________________________________________________________________________________________________________o DepositorDepositor__________________________________________________________________________________________________________________________________________________________o TrusteeTrustee__________________________________________________________________________________________________________________________________________________________o Trust AdministratorTrust Administrator__________________________________________________________________________________________________________________________________________________________o Master ServicerMaster Servicer__________________________________________________________________________________________________________________________________________________________o CustodianCustodian__________________________________________________________________________________________________________________________________________________________o 1110(b) OriginatorDepositor__________________________________________________________________________________________________________________________________________________________


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o Any 1108(a)(2) Servicer (other than the Master Servicer or TrustServicerAdministrator)__________________________________________________________________________________________________________________________________________________________o Any other party contemplated by 1100(d)(1)Depositor__________________________________________________________________________________________________________________________________________________________

Item 3: Sale of Securities and Use of ProceedsDepositorInformation from Item 2(a) of Part II of Form 10-Q:With respect to any sale of securities by the sponsor, depositor orissuing entity, that are backed by the same asset pool or are otherwiseissued by the issuing entity, whether or not registered, provide the salesand use of proceeds information in Item 701 of Regulation S-K. Pricinginformation can be omitted if securities were not registered.__________________________________________________________________________________________________________________________________________________________

Item 4: Defaults Upon Senior Securities

Trust AdministratorInformation from Item 3 of Part II of Form 10-Q:TrusteeReport the occurrence of any Event of Default (after expiration of anygrace period and provision of any required notice)__________________________________________________________________________________________________________________________________________________________

Item 5: Submission of Matters to a Vote of Security HoldersTrust AdministratorInformation from Item 4 of Part II of Form 10-QTrustee__________________________________________________________________________________________________________________________________________________________

Item 6: Significant Obligors of Pool AssetsDepositorItem 1112(b) - Significant Obligor Financial Information*__________________________________________________________________________________________________________________________________________________________*This information need only be reported on the Form 10-D for thedistribution period in which updated information is required pursuant tothe Item.__________________________________________________________________________________________________________________________________________________________

Item 7: Significant Enhancement Provider InformationItem 1114(b)(2) - Credit Enhancement Provider Financial Information*__________________________________________________________________________________________________________________________________________________________o Determining applicable disclosure thresholdDepositor__________________________________________________________________________________________________________________________________________________________o Requesting required financial information (including any requiredDepositoraccountants' consent to the use thereof) or effecting incorporation byreference__________________________________________________________________________________________________________________________________________________________


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Item 1115(b) - Derivative Counterparty Financial Information*__________________________________________________________________________________________________________________________________________________________o Determining current maximum probable exposureDepositor__________________________________________________________________________________________________________________________________________________________o Determining current significance percentageDepositor__________________________________________________________________________________________________________________________________________________________o Requesting required financial information (including any requiredDepositoraccountants' consent to the use thereof) or effecting incorporation byreference__________________________________________________________________________________________________________________________________________________________

*This information need only be reported on the Form 10-D for thedistribution period in which updated information is required pursuant to

the Items.

__________________________________________________________________________________________________________________________________________________________

Item 8: Other InformationAny party responsible for the applicable Form 8-K Disclosure itemDisclose any information required to be reported on Form 8-K during theperiod covered by the Form 10-D but not reported__________________________________________________________________________________________________________________________________________________________

Item 9: Exhibits__________________________________________________________________________________________________________________________________________________________

Monthly Statement to CertificateholdersTrust Administrator__________________________________________________________________________________________________________________________________________________________

Exhibits required by Item 601 of Regulation S-K, such as materialDepositor

agreements__________________________________________________________________________________________________________________________________________________________

EXHIBIT T

FORM OF MONTHLY STATEMENT TOCERTIFICATEHOLDERS

(i) With respect to each Class of Certificates which are notNotional Amount Certificates and, unless

otherwise stated, the related Distribution Date:

(a) the Initial Class Principal Balance of such Class as of theCut-off Date;


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(b) the Class Principal Balance of such Class before givingeffect to the distribution of principal

and interest;

(c) the amount of the related distribution on such Classallocable to interest;

(d) the amount of the related distribution on such Classallocable to principal;

(e) the sum of the principal and interest payable to such Class;

(f) the Realized Loss allocable to such Class;

(g) the Class Unpaid Interest Amount allocable to such Class;

(h) the Class Principal Balance of such Class after givingeffect to the distribution of principal

and interest;

(i) the Pass-Through Rate for such Class;

(j) any Basis Risk Shortfall allocable to such Class, if suchamount is greater than zero; and

(k) any shortfall in principal allocable to such Class, if suchamount is greater than zero.

(ii) With respect to each Class of Certificates which are NotionalAmount Certificates and, unless otherwise

stated, the related Distribution Date:

(a) the Notional Amount of such Class as of the Cut-off Date;

(b) the Notional Amount of such Class before giving effect tothe distribution of interest;

(c) the amount of the related distribution on such Classallocable to interest;

(d) the amount of the related distribution on such Classallocable to principal;

(e) the sum of the principal and interest payable to such class;

(f) the Realized Loss allocable to such Class;

(g) the Class Unpaid Interest Amount allocable to such Class;

(h) the Notional Amount of such Class after giving effect tothe distribution of interest;

(i) the Pass-Through Rate for such Class; and

(j) any Basis Risk Shortfall allocable to such Class, if suchamount is greater than zero.


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(iii) With respect to a $1000 factor of the Initial Class PrincipalBalance of each Class of Certificates

which are not Notional Amount Certificates and the relatedDistribution Date:

(a) the CUSIP number assigned to such Class;

(b) the Class Principal Balance of such Class factor prior togiving effect to the distribution of

principal and interest;

(c) the amount of the related distribution allocable tointerest on such Class factor;

(d) the amount of the related distribution allocable toprincipal on such Class factor;

(e) the sum of the principal and interest payable to such Classfactor; and

(f) the Class Principal Balance of such Class factor aftergiving effect to the distribution of

principal and interest.

(iv) With respect to a $1000 factor of the Initial Class PrincipalBalance of each Class of Certificates

which are Notional Amount Certificates and the related DistributionDate:

(a) the CUSIP number assigned to such Class;

(b) the Notional Amount of such Class factor prior to givingeffect to the distribution of interest;

(c) the amount of the related distribution allocable tointerest on such Class factor;

(d) the amount of the related distribution allocable toprincipal on such Class factor;

(e) the sum of the principal and interest payable to such Classfactor;

(f) the Notional Amount of such Class factor after givingeffect to the distribution of interest;

(v) With respect to each Loan Group, in the aggregate, and,unless otherwise stated, the related

Distribution Date,

(a) the Scheduled Payment of principal for such Loan Group;

(b) the amount of Principal Prepayments allocable to such LoanGroup;

(c) the amount of principal allocable to such Loan Group as aresult of repurchased Mortgage Loans


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in such Loan Group;

(d) the Substitution Adjustment Amount allocable to such LoanGroup;

(e) the amount of Net Liquidation Proceeds allocable to suchLoan Group;

(f) the amount of Insurance Proceeds allocable to such LoanGroup;

(g) the amount of any other distributions allocable toprincipal for such Loan Group;

(h) the number of Mortgage Loans in such Loan Group as of thefirst day of the related Collection

Period;

(i) the aggregate Stated Principal Balance of the MortgageLoans in such Loan Group as of the first

day of the related Collection Period;

(j) the number of Mortgage Loans in such Loan Group as ofthe last day of the related Collection

Period;

(k) the aggregate Stated Principal Balance of the MortgageLoans in such Loan Group as of the last

day of the related Collection Period;

(l) the Master Servicing Fee, by Loan Group;

(m) the sum of the Servicing Fee, the Mortgage GuarantyInsurance Policy fees, if applicable and

the [RMIC/TGIC/MGIC] PMI fees, if applicable, for such LoanGroup;

(n) the Trust Administrator Fee applicable to such Loan Group;

(o) the amount of current Advances allocable to such Loan Group;

(p) the amount of outstanding Advances allocable to such LoanGroup;

(q) the number and aggregate principal amounts of MortgageLoans that were delinquent, using the

OTS method (1) 30 to 59 days, (2) 60 to 89 days and (3)90 days or more, for such Loan Group,

including delinquent bankrupt Mortgage Loans but excludingforeclosure and REO Mortgage Loans;

(r) the number and aggregate principal amounts of MortgageLoans that are currently in bankruptcy,

but not delinquent, for such Loan Group;

(s) the number and aggregate principal amounts of MortgageLoans that are in foreclosure for such


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Loan Group;

(t) the Rolling Three-Month Delinquency Rate for such LoanGroup;

(u) the number and aggregate principal amount of any REOproperties as of the close of business on

the Determination Date preceding such Distribution Date forsuch Loan Group;

(v) current Realized Losses allocable to such Loan Group;

(w) cumulative Realized Losses allocable to such Loan Group;

(x) the weighted average term to maturity of the MortgageLoans in such Loan Group as of the close

of business on the last day of the calendar month precedingthe related Distribution Date;

(y) the number and principal amount of claims submitted

under the Mortgage Guaranty InsurancePolicy, as applicable;

(z) the number and principal amount of claims paid underthe [RMIC/TGIC/MGIC] PMI Policy, as

applicable;

(aa) the number of Mortgage Loans in such Loan Group that haveAssigned Prepayment Premiums and for

which prepayments were made during the related CollectionPeriod, as applicable;

(bb) the aggregate principal balance of Mortgage Loans insuch Loan Group that have Assigned

Prepayment Premiums and for which prepayments were madeduring the related Collection Period,

as applicable;

(cc) the aggregate amount of Assigned Prepayment Premiumscollected for such Loan Group during the

related Collection Period, as applicable;

(dd) current Realized Losses allocated to each Mortgage Loanin such Loan Group that has previously

been allocated a Realized Loss;

(ee) cumulative Realized Losses allocated to each MortgageLoan in such Loan Group that has

previously been allocated a Realized Loss;

(ff) current Recoveries allocable to such Loan Group;

(gg) cumulative Recoveries allocable to such Loan Group;

(hh) current aggregate Stated Principal Balance of QualifiedSubstitute Mortgage Loans substituted

for Deleted Mortgage Loans in such Loan Group;


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(ii) cumulative aggregate Stated Principal Balance ofQualified Substitute Mortgage Loans

substituted for Deleted Mortgage Loans in such Loan Group;and

(jj) with respect to all of the Mortgage Loans, in theaggregate, and, unless otherwise stated, the

related Distribution Date, for each Servicer that isservicing any of such Mortgage Loans, the

aggregate Stated Principal Balance of Mortgage Loansbeing serviced by such Servicer as of such

Distribution Date.

(vi) With respect to each overcollateralized Group of Certificates and,unless otherwise stated, the related

Distribution Date:

(a) the Targeted Overcollateralization Amount for such Group;

(b) the Overcollateralization Amount for such Group;

(c) the Overcollateralization Deficiency for such Group;

(d) the Overcollateralization Release Amount for such Group;

(e) the Monthly Excess Interest for such Group;

(f) the amount of any payment to the [Class __-X] Certificatesrelated to such Group; and

(g) if applicable, the Excess Interest Amount from anunrelated Group of Certificates that provides

additional credit enhancement to the relatedovercollateralized Group of Certificates.

(vii) With respect to Modified Mortgage Loans and the related DistributionDate:

(a) the following information with respect to all MortgageLoans that became Modified Mortgage

Loans during the related Collection Period:

(1) Loan Number;

(2) Loan Group;

(3) Transaction Identifier (code indicating therelated Series);

(4) Modification Date;

(5) Unpaid Principal Balance Prior to Modification;

(6) Unpaid Principal Balance Post Modification;

(7) Scheduled Payment Prior to Modification;


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(8) Scheduled Payment Post Modification;

(9) Total Capitalized Amount;

(10) Scheduled Balloon Payment Amount Prior toModification;

(11) Scheduled Balloon Payment Amount Created byModification;

(12) Scheduled Balloon Payment Date Prior toModification;

(13) Scheduled Balloon Payment Date Created byModification;

(14) Mortgage Rate Prior to Modification;

(15) Mortgage Rate Post Modification;

(16) Maturity Date Prior to Modification;

(17) Maturity Date Post Modification;

(18) Number of Days Delinquent Prior to Modification;

(19) Number of Days Delinquent Post Modification;

(20) Delinquency Status Prior to Modification;

(21) Delinquency Status Post Modification;

(22) Amount Accepted (if Less Than the OutstandingPrincipal Balance) in Satisfaction of

Such Mortgage Loan; and

(23) Shortfall Created by Acceptance of Amount Lessthan the Outstanding Principal Balance

of Such Mortgage Loan; and

(b) the information listed in clause (a) above withrespect to all Mortgage Loans that became

Modified Mortgage Loans during Collection Periods prior tothe related Collection Period.

EXHIBIT U

FORM 8-K DISCLOSURE INFORMATION

_________________________________________________________________________________________________________________________________________________________

FORM 8-KDISCLOSURE INFORMATION


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_________________________________________________________________________________________________________________________________________________________

Item on Form 8-KParty Responsible_________________________________________________________________________________________________________________________________________________________

Item 1.01- Entry into a Material Definitive AgreementAll parties (as to themselves)Disclosure is required regarding entry into or amendment of any definitiveagreement that is material to the securitization, even if depositor is nota party.Examples: servicing agreement, custodial agreement.Note: disclosure not required as to definitive agreements that are fullydisclosed in the prospectus_________________________________________________________________________________________________________________________________________________________

Item 1.02- Termination of a Material Definitive AgreementAll parties (as to themselves)Disclosure is required regarding termination of any definitive agreementthat is material to the securitization (other than expiration in

accordance with its terms), even if depositor is not a party.Examples: servicing agreement, custodial agreement._________________________________________________________________________________________________________________________________________________________

Item 1.03- Bankruptcy or ReceivershipDepositorDisclosure is required regarding the bankruptcy or receivership, withrespect to any of the following:_________________________________________________________________________________________________________________________________________________________o Sponsor (Seller)Depositor/Sponsor (Seller)_________________________________________________________________________________________________________________________________________________________o DepositorDepositor_________________________________________________________________________________________________________________________________________________________o Master ServicerMaster Servicer_________________________________________________________________________________________________________________________________________________________o Affiliated ServicerServicer_________________________________________________________________________________________________________________________________________________________

Other Servicer servicing 20% or more of the pool assets at the time ofServicerthe report_________________________________________________________________________________________________________________________________________________________o Other material servicersServicer_________________________________________________________________________________________________________________________________________________________o TrusteeTrustee


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of any master servicer, affiliated servicer, other servicer servicing 10%or more of pool assets at time of report, other material servicers ortrustee._________________________________________________________________________________________________________________________________________________________Reg AB disclosure about any new servicer or master servicer is alsoServicer/Master Servicer/Depositorrequired._________________________________________________________________________________________________________________________________________________________Reg AB disclosure about any new Trustee is also required.Trustee_________________________________________________________________________________________________________________________________________________________

Item 6.03- Change in Credit Enhancement or External SupportDepositor/Trust AdministratorCovers termination of any enhancement in manner other than by its terms,the addition of an enhancement, or a material change in the enhancementprovided. Applies to external credit enhancements as well asderivatives.

_________________________________________________________________________________________________________________________________________________________Reg AB disclosure about any new enhancement provider is also required.Depositor_________________________________________________________________________________________________________________________________________________________

Item 6.04- Failure to Make a Required DistributionTrust Administrator_________________________________________________________________________________________________________________________________________________________

Item 6.05- Securities Act Updating DisclosureDepositorIf any material pool characteristic differs by 5% or more at the time ofissuance of the securities from the description in the final prospectus,provide updated Reg AB disclosure about the actual asset pool._________________________________________________________________________________________________________________________________________________________If there are any new servicers or originators required to be disclosedDepositorunder Regulation AB as a result of the foregoing, provide the informationcalled for in Items 1108 and 1110 respectively._________________________________________________________________________________________________________________________________________________________

Item 7.01- Reg FD DisclosureAll parties (as to themselves)_________________________________________________________________________________________________________________________________________________________

Item 8.01- Other EventsDepositor

Any event, with respect to which information is not otherwise called forin Form 8-K, that the registrant deems of importance to certificateholders._________________________________________________________________________________________________________________________________________________________

Item 9.01- Financial Statements and ExhibitsResponsible party for reporting/disclosing the financial statement or exhibit


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and except as disclosed in the Compliance Statement, the ServicingAssessment or the Attestation Report, theCompany has fulfilled its obligations under the Agreement in all materialrespects; and

(5) The Compliance Statement required to be delivered by theCompany pursuant to the Agreement, andthe Servicing Assessment and Attestation Report required to be providedby the Company and any Sub-Servicer orSubcontractor pursuant to the Agreement, have been provided to TrustAdministrator. Any material instances ofnoncompliance described in such reports have been disclosed to TrustAdministrator. Any material instance ofnoncompliance with the Servicing Criteria has been disclosed in such reports.

By: ______________________________________Name:Title

Date:

EXHIBIT W

ADDITIONAL DISCLOSURE NOTIFICATION

Wells Fargo Bank, N.A.Old Annapolis RoadColumbia, Maryland 21045Fax: (410) 715-2380Email: [email protected]: Corporate Trust Services- CSFBMSC, [Name of Series Trust], Adjustable

Rate Mortgage-Backed Pass-ThroughCertificates, [Series Name]-SEC REPORT PROCESSING

Credit Suisse First Boston Mortgage Securities Corp.Eleven Madison AvenueNew York, New York 10010

RE: **Additional Form [10-D][10-K][8-K] Disclosure** Required


In accordance with Article XIII of the Series Supplement dated as of___________________ and the Standard Termsof Pooling and Servicing Agreement dated May 1, 2007 (collectively, the"Agreement") by and among the Depositor,the Seller(s), the Master Servicer, the Trust Administrator, the SpecialServicer, the Modification OversightAgent, the Trustee and the Servicers that are party to the SeriesSupplement, the undersigned, as [], hereby notifies you that certain events have come to our attentionthat [will] [may] need to be disclosed onForm [10-D] [ 10-K] [8-K].


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Description of Additional Form [10-D][10-K][8-K] Disclosure:

List of any Attachments hereto to be included in the Additional Form [10-D][ 10-K][8-K] Disclosure:

Any inquiries related to this notification should be directed to [], phone number:[ ]; email address: [ ].

[NAME OF PARTY],as [role]

By:_________________________________________

Name:Title:

EXHIBIT X

[RESERVED]

EXHIBIT Y

ADDITIONAL FORM 10-K DISCLOSURE

_________________________________________________________________________________________________________________________________________________________

ADDITIONAL FORM10-K DISCLOSURE

_________________________________________________________________________________________________________________________________________________________Item on Form 10-K

Party Responsible_________________________________________________________________________________________________________________________________________________________

Item 1B: Unresolved Staff CommentsDepositor_________________________________________________________________________________________________________________________________________________________

Item 9B: Other InformationAny party responsible for disclosure items on Form 8-KDisclose any information required to be reported on Form 8-K during thefourth quarter covered by the Form 10-K but not reported_________________________________________________________________________________________________________________________________________________________

Item 15: Exhibits, Financial Statement SchedulesTrust Administrator Depositor_________________________________________________________________________________________________________________________________________________________

Reg AB Item 1112(b): Significant Obligors of Pool Assets


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_________________________________________________________________________________________________________________________________________________________Significant Obligor Financial Information*Depositor_________________________________________________________________________________________________________________________________________________________*This information need only be reported on the Form 10-D for thedistribution period in which updated information is required pursuant tothe Item._________________________________________________________________________________________________________________________________________________________

Reg AB Item 1114(b)(2): Credit Enhancement Provider Financial Information_________________________________________________________________________________________________________________________________________________________o Determining applicable disclosure thresholdDepositor_________________________________________________________________________________________________________________________________________________________o Requesting required financial information (including any requiredDepositor

accountants' consent to the use thereof) or effecting incorporation byreference_________________________________________________________________________________________________________________________________________________________*This information need only be reported on the Form 10-D for thedistribution period in which updated information is required pursuant tothe Items._________________________________________________________________________________________________________________________________________________________

Reg AB Item 1115(b): Derivative Counterparty Financial Information_________________________________________________________________________________________________________________________________________________________o Determining current maximum probable exposureDepositor_________________________________________________________________________________________________________________________________________________________o Determining current significance percentageDepositor_________________________________________________________________________________________________________________________________________________________o Requesting required financial information (including any requiredDepositoraccountants' consent to the use thereof) or effecting incorporation byreference_________________________________________________________________________________________________________________________________________________________*This information need only be reported on the Form 10-D for thedistribution period in which updated information is required pursuant tothe Items._________________________________________________________________________________________________________________________________________________________

Reg AB Item 1117: Legal ProceedingsAny legal proceeding pending against the following entities or theirrespective property, that is material to Certificateholders, including anyproceeding sknown to be contemplated by governmental authorities:_________________________________________________________________________________________________________________________________________________________


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o Issuing Entity (Trust Fund)Trustee, Master Servicer, Trust Administrator and Depositor_________________________________________________________________________________________________________________________________________________________o Sponsor (Seller)Seller (if a party to the Agreement) or Depositor_________________________________________________________________________________________________________________________________________________________o DepositorDepositor_________________________________________________________________________________________________________________________________________________________o TrusteeTrustee_________________________________________________________________________________________________________________________________________________________o Trust AdministratorTrust Administrator_________________________________________________________________________________________________________________________________________________________

o Master ServicerMaster Servicer_________________________________________________________________________________________________________________________________________________________o CustodianCustodian_________________________________________________________________________________________________________________________________________________________o 1110(b) OriginatorDepositor_________________________________________________________________________________________________________________________________________________________o Any 1108(a)(2) Servicer (other than the Master Servicer or TrustServicerAdministrator)_________________________________________________________________________________________________________________________________________________________o Any other party contemplated by 1100(d)(1)Depositor_________________________________________________________________________________________________________________________________________________________

Reg AB Item 1119: Affiliations and Relationships_________________________________________________________________________________________________________________________________________________________Whether (a) the Sponsor (Seller), Depositor or Issuing Entity is anDepositor as to (a)affiliate of the following parties, and (b) to the extent known andSponsor/Seller as to (a)material, any of the following parties are affiliated with one another:

_________________________________________________________________________________________________________________________________________________________o Master ServicerMaster Servicer_________________________________________________________________________________________________________________________________________________________


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o Trust AdministratorTrust Administrator_________________________________________________________________________________________________________________________________________________________o TrusteeTrustee_________________________________________________________________________________________________________________________________________________________o Any other 1108(a)(3) servicerServicer_________________________________________________________________________________________________________________________________________________________o Any 1110 OriginatorDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1112(b) Significant ObligorDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________

o Any 1114 Credit Enhancement ProviderDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1115 Derivate Counterparty ProviderDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any other 1101(d)(1) material partyDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________Whether there are any "outside the ordinary course business arrangements"Depositor as to (a)other than would be obtained in an arm's length transaction between (a)Sponsor/Seller as to (a)the Sponsor (Seller), Depositor or Issuing Entity on the one hand, and (b)any of the following parties (or their affiliates) on the other hand, thatexist currently or within the past two years and that are material to aCertificateholder's understanding of the Certificates:_________________________________________________________________________________________________________________________________________________________o Master ServicerMaster Servicer_________________________________________________________________________________________________________________________________________________________o Trust AdministratorTrust Administrator_________________________________________________________________________________________________________________________________________________________o TrusteeTrustee_________________________________________________________________________________________________________________________________________________________o Any other 1108(a)(3) servicerServicer


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_________________________________________________________________________________________________________________________________________________________o Any 1110 OriginatorDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1112(b) Significant ObligorDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1114 Credit Enhancement ProviderDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1115 Derivate Counterparty ProviderDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any other 1101(d)(1) material partyDepositor/Sponsor

_________________________________________________________________________________________________________________________________________________________Whether there are any specific relationships involving the transaction orDepositor as to (a)the pool assets between (a) the Sponsor (Seller), Depositor or IssuingSponsor/Seller as to (a)Entity on the one hand, and (b) any of the following parties (or theiraffiliates) on the other hand, that exist currently or within the past twoyears and that are material:_________________________________________________________________________________________________________________________________________________________o Master ServicerMaster Servicer_________________________________________________________________________________________________________________________________________________________o Trust AdministratorTrust Administrator_________________________________________________________________________________________________________________________________________________________o TrusteeTrustee_________________________________________________________________________________________________________________________________________________________o Any other 1108(a)(3) servicerServicer_________________________________________________________________________________________________________________________________________________________o Any 1110 OriginatorDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1112(b) Significant ObligorDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any 1114 Credit Enhancement ProviderDepositor/Sponsor


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_________________________________________________________________________________________________________________________________________________________o Any 1115 Derivate Counterparty ProviderDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________o Any other 1101(d)(1) material partyDepositor/Sponsor_________________________________________________________________________________________________________________________________________________________

EXHIBIT Z

FORM OF CERTIFICATION

REGARDING SUBSTITUTION OF DEFECTIVE MORTGAGELOANS

OFFICER'S CERTIFICATE OF DLJ MORTGAGECAPITAL, INC.

[__________], 200_

I, ____________, hereby certify that I am the duly authorizedofficer of DLJ Mortgage Capital, Inc., aDelaware corporation ("DLJMC"), and further certify that each of theMortgage Loans substituted by DLJMC on_______________, 20[___] were in violation of the terms of the Mortgagesrelated thereto.

Capitalized terms used but not defined herein have the

meanings ascribed to them in the SeriesSupplement dated as of ___________________ and the Standard Terms ofPooling and Servicing Agreement dated May 1,2007 (collectively, the "Agreement") by and among the Depositor, theSeller(s), the Master Servicer, the TrustAdministrator, the Special Servicer, the Modification Oversight Agent,the Trustee and the Servicers that areparty to the Series Supplement.

DLJ MORTGAGECAPITAL, INC.

____________________________________

Name:Title:

SCHEDULE I

MORTGAGE LOAN SCHEDULE

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