**UNITED STATESSECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 10-K**

(Mark One)

**/X/ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF1934**

**For the fiscal year ended December 31, 2016or**

**/ /  ****TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OFTHE SECURITIES EXCHANGE ACT OF 1934**

**For the transition period from _____ to _____Commission file number of the issuing entity: 333-206703-01**

**Central Index Key Number of the issuing entity:0001655153**

**CSAIL 2015-C4 Commercial MortgageTrust**

**(exact name of the issuing entity as specified in itscharter)**

** **

**Central Index Key Number of the depositor: 0000802106**

**Credit Suisse First Boston MortgageSecurities Corp.**

**(exact name of the depositor as specified in itscharter)**

** **

**Central Index Key Number of the sponsor: 0001628601**

**Column Financial, Inc.**

**(exact name of the sponsor as specified in its charter)**

** **

**Central Index Key Number of the sponsor: 0001632269**

**Benefit Street Partners CRE FinanceLLC**

**(exact name of the sponsor as specified in its charter)**

** **

**Central Index Key Number of the sponsor: 0001666643**

**Walker & Dunlop CommercialProperty Funding I CS, LLC**

**(exact name of the sponsor as specified in its charter)**

** **

**Central Index Key Number of the sponsor: 0001505494**

**The Bancorp Bank**

**(exact name of the sponsor as specified in its charter)**

** **

**Central Index Key Number of the sponsor: 0001576832**

**MC-Five Mile Commercial MortgageFinance LLC**

**(exact name of the sponsor as specified in its charter)**

** **

| **New York****(State or other jurisdiction of  incorporation or organization of**

**the issuing entity)** | **38-3984607**

**38-3984608**

**(I.R.S. Employer**

**Identification Numbers)** |
|------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------|

**c/o Wells Fargo Bank, National Association**

**as Certificate Administrator**

**9062 Old Annapolis Road**

**Columbia, MD**

**(Address of principalexecutive offices of the issuing entity)**

**21045**

**(Zip Code)**

**Registrant’s telephonenumber, including area code:**

**(212) 272-6858**

Securities registered pursuant to Section 12(b) of theAct:  None.

Securities registered pursuant to Section 12(g) of theAct:  None.

Indicate by check mark if the registrant is a well-knownseasoned issuer, as defined in Rule 405 of the Securities Act.  / / Yes /X/ No

Indicate by check mark if the registrant is not required tofile reports pursuant to Section 13 or Section 15(d) of the Act.  / / Yes /X/ No

Indicate by check mark whether the registrant (1) has filedall reports required to be filed by Section 13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter periodthat the registrant was required to file such reports), and (2) has beensubject to such filing requirements for the past 90 days.  /X/ Yes / /No

Indicate by check mark whether the registrant has submittedelectronically and posted on its corporate Web site, if any, every InteractiveData File required to be submitted and posted pursuant to Rule 405 ofRegulation S-T (Section 232.405 of this chapter) during the preceding 12 months(or for such shorter period that the registrant was required to submit and postsuch files).

Not applicable.

Indicate by check mark if disclosure of delinquent filerspursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) is notcontained herein, and will not be contained, to the best of registrant’sknowledge, in definitive proxy or information statements incorporated byreference in Part III of this Form 10-K or any amendment to this Form10-K.   

Not applicable.

Indicate by check mark whether the registrant is a largeaccelerated filer, an accelerated filer, a non-accelerated filer, or a smallerreporting company. See definitions of “large accelerated filer”,“accelerated filer” and “smaller reporting company” inRule 12b-2 of the Exchange Act.

Large acceleratedfiler          //                                                                                                        Accelerated filer                                     / /

Non-acceleratedfiler           /X/  (Do not check if asmaller reporting company)                         Smaller reporting company                    / /

Indicate by check mark whether the registrant is a shellcompany (as defined in Rule 12b-2 of the Act).  / / Yes /X/ No

State the aggregate market value of the voting and non-votingcommon equity held by non-affiliates computed by reference to the price atwhich the common equity was last sold, or the average bid and asked price ofsuch common equity, as of the last business day of the registrant’s mostrecently completed second fiscal quarter.

Not applicable.

Indicate by check mark whether the registrant has filed alldocuments and reports required to be filed by Section 12, 13 or 15(d) of theSecurities Exchange Act of 1934 subsequent to the distribution of securitiesunder a plan confirmed by a court.  / / Yes / /No

Not applicable.

Indicate the number of shares outstanding of each of theregistrant’s classes of common stock, as of the latest practicable date.

Not applicable.

**DOCUMENTS INCORPORATED BY REFERENCE**

** **

List hereunder the following documents if incorporated byreference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) intowhich the document is incorporated: (1) Any annual report to security holders; (2)Any proxy or information statement; and (3) Any prospectus filed pursuant toRule 424(b) or (c) under the Securities Act of 1933. The listed documentsshould be clearly described for identification purposes (e.g., annual report tosecurity holders for fiscal year ended December 24, 1980).

Not applicable.

 

 

TheExhibit Index describes exhibits provided by certain parties (in theircapacities indicated on the Exhibit Index) with respect to the Arizona GrandResort & Spa Mortgage Loan, which constituted approximately 4.8% of theasset pool of the issuing entity as of its cut-off date.  The ArizonaGrand Resort & Spa Mortgage Loan is an asset of the issuing entity and ispart of a loan combination that includes the Arizona Grand Resort & SpaMortgage Loan and one other *pari passu* loan, which is not an asset ofthe issuing entity. The other *pari passu* portion of the loan combinationwas securitized in the CSAIL 2015-C3 Commercial Mortgage Trust transaction,Commission File Number 333-199921-03 (the “CSAIL 2015-C3 Transaction”).This loan combination, including the Arizona Grand Resort & Spa MortgageLoan, is being serviced and administered pursuant to the pooling and servicingagreement for the CSAIL 2015-C3 Transaction, which is incorporated by referenceas Exhibit 4.2 to this Annual Report on Form 10-K.  Midland Loan Services,a Division of PNC Bank, National Association is the master servicer under thepooling and servicing agreement for the CSAIL 2015-C3 Transaction.  Theresponsibilities of Midland Loan Services, a Division of PNC Bank, NationalAssociation, as primary servicer of this loan combination with respect to theissuing entity, are subsumed within its responsibilities as master servicerunder the pooling and servicing agreement for the CSAIL 2015-C3Transaction.  Thus, the servicer compliance statement provided by MidlandLoan Services, a Division of PNC Bank, National Association, as master servicerunder such pooling and servicing agreement, encompasses its roles as bothmaster servicer and primary servicer with respect to this loan combination.

WellsFargo Bank, National Association is the master servicer and certificateadministrator of the mortgage loans serviced under the Pooling and ServicingAgreement and the certificate administrator of the Arizona Grand Resort &Spa Mortgage Loan. As a result, Wells Fargo Bank, National Association is a“servicer” as defined in Item 1108(a)(2)(iii) of Regulation AB, inthe capacities described above, because it is servicing mortgage loans thatconstituted 10% or more of the assets of the issuing entity as of its cut-offdate. The assessments of compliance with applicable servicing criteria,accountants’ attestation reports and servicer compliance statementsdelivered by Wells Fargo Bank, National Association in the capacities describedabove are listed in the Exhibit Index.

Wells Fargo Bank, National Association is the custodian ofthe mortgage loans serviced under the Pooling and Servicing Agreement and theArizona Grand Resort & Spa Mortgage Loan.  As a result, Wells FargoBank, National Association is a servicing function participant in thecapacities described above, because it is servicing mortgage loans thatconstituted 5% or more of the assets of the issuing entity as of its cut-off date.The assessments of compliance with applicable servicing criteria andaccountants’ attestation reports delivered by Wells Fargo Bank, NationalAssociation in the capacities described above are listed in the Exhibit Index.

MidlandLoan Services, a Division of PNC Bank, National Association is the specialservicer of the mortgage loans serviced under the Pooling and ServicingAgreement and the primary servicer of the Arizona Grand Resort & SpaMortgage Loan. As a result, Midland Loan Services, a Division of PNC Bank,National Association is a “servicer” as defined in Item1108(a)(2)(iii) of Regulation AB, in the capacities described above, because itis servicing mortgage loans that constituted 10% or more of the assets of theissuing entity as of its cut-off date. The assessments of compliance withapplicable servicing criteria, accountants’ attestation reports andservicer compliance statements delivered by Midland Loan Services, a Divisionof PNC Bank, National Association in the capacities described above are listedin the Exhibit Index.

Pentalpha Surveillance LLC is the operating advisor of themortgage loans serviced under the Pooling and Servicing Agreement and theArizona Grand Resort & Spa Mortgage Loan.  As a result, PentalphaSurveillance LLC is a servicing function participant in the capacitiesdescribed above, because it is servicing mortgage loans that constituted 5% ormore of the assets of the issuing entity as of its cut-off date. Theassessments of compliance with applicable servicing criteria andaccountants’ attestation reports delivered by Pentalpha Surveillance LLCin the capacities described above are listed in the Exhibit Index.

WilmingtonTrust, National Association acts as trustee of the mortgage loans servicedunder the Pooling and Servicing Agreement.  Pursuant to the Pooling andServicing Agreement, the trustee is required to provide an assessment ofcompliance with applicable servicing criteria solely with respect to Item1122(d)(2)(iii) of Regulation AB (regarding advances of funds or guaranteesregarding collections, cash flows or distributions, and any interest or otherfees charged for such advances, are made, reviewed and approved as specified inthe transaction agreements). However, during the reporting period, the trusteedid not perform any servicing function with respect to the servicing criteriaspecified in Item 1122(d)(2)(iii) of Regulation AB.  The master serviceror the special servicer, to the extent required, performed the servicingfunction identified with respect to Item 1122(d)(2)(iii) of Regulation AB, andeach such party included Item 1122(d)(2)(iii) of Regulation AB in theassessment of compliance with applicable servicing criteria andaccountant’s attestation report for the subject transaction.  As aresult, this Annual Report on Form 10-K does not include an assessment ofcompliance with applicable servicing criteria of the trustee. One or more otherservicers of the mortgage loans serviced under the Pooling and ServicingAgreement have delivered one or more assessments of compliance with respect toItem 1122(d)(2)(iii) of Regulation AB.

ThisAnnual Report on Form 10-K includes assessments of compliance with applicableservicing criteria and accountants’ attestation reports from CoreLogicCommercial Real Estate Services, Inc. and National Tax Search, LLC.  Theseentities were engaged by the master servicer under the Pooling and ServicingAgreement to remit tax payments received from the escrow accounts of borrowersto local taxing authorities, to report tax amounts due, to verify tax parcelinformation, and to verify non-escrow tax payments. These servicing functionsare included within the servicing criteria set forth in Items 1122(d)(4)(xi)and 1122(d)(4)(xii) of Regulation AB.  Therefore, under the principles-baseddefinition of “servicer” set forth in Item 1101(j) of Regulation ABthat looks to the functions that an entity performs, these vendors are“servicers” for the purposes of Item 1122 of Regulation AB.  *See*Compliance and Disclosure Interpretations, Section 301.01 (Item 1101(j)).

Withrespect to the *pari passu* loan combination that includes the ArizonaGrand Resort & Spa Mortgage Loan, (i) the report on assessment ofcompliance with servicing criteria and attestation report on assessment ofcompliance with servicing criteria of Rialto Capital Advisors, LLC as specialservicer of the Arizona Grand Resort & Spa Mortgage Loan, listed on theExhibit Index is omitted from this Annual Report on Form 10-K as it is notrequired to be included on this Annual Report on Form 10-K per Instruction 3 toItem 1122 of Regulation AB because it is a party performing activities thataddress servicing criteria relating to 5% or less of the assets of the issuingentity; and (ii) the servicer compliance statement of Rialto Capital Advisors,LLC as special servicer of the Arizona Grand Resort & Spa Mortgage Loan,listed on the Exhibit Index is omitted from this Annual Report on Form 10-K asit is not required by Item 1123 of Regulation AB to be included on this AnnualReport on Form 10-K because it is an unaffiliated party that is not a“servicer” that meets the criteria in Item 1108(a)(2)(i) through(iii) of Regulation AB. 

**PART I**

**Item 1.  Business.**

Omitted.

**Item 1A.  Risk Factors.**

Omitted.

**Item 1B.  Unresolved Staff Comments.**

None.

**Item 2.  Properties.**

Omitted.

**Item 3.  Legal Proceedings.**

Omitted.

**Item 4.  Mine Safety Disclosures.**

Not applicable.

**PART II**

**Item 5.  Market for Registrant’s Common Equity,Related Stockholder Matters and Issuer Purchases of Equity Securities.**

Omitted.

**Item 6.  Selected Financial Data.**

Omitted.

**Item 7.  Management’s Discussion and Analysisof Financial Condition and Results of Operations.**

Omitted.

**Item 7A.  Quantitative and Qualitative DisclosuresAbout Market Risk.**

Omitted.

**Item 8.  Financial Statements and Supplementary Data.**

Omitted.

**Item 9.  Changes in and Disagreements WithAccountants on Accounting and Financial Disclosure.**

Omitted.

**Item 9A.  Controls and Procedures.**

Omitted.

**Item 9B.  Other Information.**

None.

**PART III**

**Item 10.  Directors, Executive Officers and CorporateGovernance.**

Omitted.

**Item 11.  Executive Compensation.**

Omitted.

**Item 12.  Security Ownership of Certain BeneficialOwners and Management and Related Stockholder Matters.**

Omitted.

**Item 13.  Certain Relationships and Related Transactions,and Director Independence.**

Omitted.

**Item 14.  Principal Accounting Fees and Services.**

Omitted.

**ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB**

**Item 1112(b) of Regulation AB, Significant ObligorFinancial Information.**

The Fairmont Orchid Mortgage Loan (Loan # 1 on Annex A of theprospectus supplement of the registrant relating to the issuing entity filed onNovember 25, 2015 pursuant to Rule 424(b)(5)) constitutes a significant obligorwithin the meaning of Item 1101(k)(2) of Regulation AB as disclosed in theprospectus supplement. In accordance with Item 1112(b) of Regulation AB, themost recent unaudited net operating income of the significant obligor was $17,341,364.00 for the twelve- month period endedDecember 31, 2016.

**Item 1114(b)(2) of Regulation AB, Significant EnhancementProvider Financial Information.**

No entity or group of affiliated entities provides any external creditenhancement or other support for the certificates within this transaction asdescribed under Item 1114(a) of Regulation AB.

**Item 1115(b) of Regulation AB, Certain DerivativesInstruments (Financial Information).**

No entity or group of affiliated entities provides anyderivative instruments or other support for the certificates within this transactionas described under Item 1115 of Regulation AB.

**Item 1117 of Regulation AB, Legal Proceedings.**

The registrant knows of nomaterial pending legal proceeding involving the trust or any party related tothe trust, other than routine litigation incidental to the duties of thoserespective parties, and the following, with respect to Wells Fargo Bank,National Association, as trustee, certificate administrator and custodian.

On June 18, 2014, a group of institutional investors filed a civil complaint inthe Supreme Court of the State of New York, New York County, against WellsFargo Bank, N.A. (“Wells Fargo Bank”), in its capacity astrustee under 276 residential mortgage backed securities (“RMBS”)trusts, which was later amended on July 18, 2014, to increase the number oftrusts to 284 RMBS trusts. On November 24, 2014, the plaintiffs filed a motionto voluntarily dismiss the state court action without prejudice. That same day,a group of institutional investors filed a putative class action complaint inthe United States District Court for the Southern District of New York (the“District Court”) against Wells Fargo Bank, alleging claimsagainst the bank in its capacity as trustee for 274 RMBS trusts (the “FederalCourt Complaint”). In December 2014, the plaintiffs’ motion tovoluntarily dismiss their original state court action was granted. As with theprior state court action, the Federal Court Complaint is one of six similarcomplaints filed contemporaneously against RMBS trustees (Deutsche Bank,Citibank, HSBC, Bank of New York Mellon and US Bank) by a group ofinstitutional investor plaintiffs. The Federal Court Complaint against WellsFargo Bank alleges that the trustee caused losses to investors and assertscauses of action based upon, among other things, the trustee's alleged failureto: (i) notify and enforce repurchase obligations of mortgage loan sellers forpurported breaches of representations and warranties, (ii) notify investors ofalleged events of default, and (iii) abide by appropriate standards of carefollowing alleged events of default. Relief sought includes money damages in anunspecified amount, reimbursement of expenses, and equitable relief. Othercases alleging similar causes of action have been filed against Wells FargoBank and other trustees in the District Court by RMBS investors in these andother transactions, and these cases against Wells Fargo Bank are proceedingbefore the same District Court judge. A similar complaint was also filed May27, 2016 in New York state court by a different plaintiff investor. On January19, 2016, an order was entered in connection with the Federal Court Complaintin which the District Court declined to exercise jurisdiction over 261 trusts atissue in the Federal Court Complaint; the District Court also allowedplaintiffs to file amended complaints as to the remaining, non-dismissedtrusts, if they so chose, and three amended complaints have been filed. OnDecember 17, 2016, the investor plaintiffs in the 261 trusts dismissed from theFederal Court Complaint filed a new complaint in New York state court (the“State Court Complaint”). Motions to dismiss all of theactions are pending except for the recently filed State Court Complaint. Therecan be no assurances as to the outcome of the litigations, or the possibleimpact of the litigations on the trustee or the RMBS trusts. However, WellsFargo Bank denies liability and believes that it has performed its obligationsunder the RMBS trusts in good faith, that its actions were not the cause of anylosses to investors, and that it has meritorious defenses, and it intends tocontest the plaintiffs’ claims vigorously. 

**Item 1119 of Regulation AB, Affiliations and CertainRelationships and Related Transactions.**

The information regarding this Item has been previouslyprovided in a prospectus supplement of the Registrant relating to the issuingentity filed on November 25, 2015 pursuant to Rule 424(b)(5).

**Item 1122 of Regulation AB, Compliance with ApplicableServicing Criteria.**

The reports on assessments of compliance with the servicingcriteria for asset-backed securities and related attestation reports on suchassessments of compliance with respect to the mortgage loans are attachedhereto under Item 15 to this Annual Report on Form 10-K. Attached as Exhibit Oto the Pooling and Servicing Agreement incorporated by reference as Exhibit 4.1to this Annual Report on Form 10-K is a chart identifying the entitiesparticipating in a servicing function for the transaction responsible for eachapplicable servicing criteria set forth in Item 1122(d).

The reports on assessments of compliance with the servicingcriteria for asset-backed securities and related attestation reports on suchassessments of compliance with respect to the Arizona Grand Resort & SpaMortgage Loan, which is being serviced and administered pursuant to the poolingand servicing agreement for the CSAIL 2015-C3 Transaction, are attached heretounder Item 15 to this Annual Report on Form 10-K. Attached as Exhibit O to thepooling and servicing agreement for the CSAIL 2015-C3 Transaction incorporatedby reference as Exhibit 4.2 to this Annual Report on Form 10-K is a chartidentifying the entities participating in a servicing function for the CSAIL 2015-C3Transaction responsible for each applicable servicing criteria set forth inItem 1122(d).

**Item 1123 of Regulation AB, Servicer Compliance Statement.**

The servicer compliance statements are attached as Exhibitsto this Annual Report on Form 10-K.

**PART IV**

** **

 

**Item15. Exhibits, Financial Statement Schedules**

 

(a)The following is a list of documents filed as part of this Annual Report onForm 10-K:

 

(1)Not applicable

 

(2)Not applicable

 

(3)See below

 

4.1Pooling and Servicing Agreement, dated as of November 1, 2015, by and amongCredit Suisse First Boston Mortgage Securities Corp., as Depositor, Wells FargoBank, National Association, as Master Servicer, Midland Loan Services, aDivision of PNC Bank, National Association, as Special Servicer, PentalphaSurveillance LLC, as Operating Advisor, Wells Fargo Bank, National Association,as Certificate Administrator and Wilmington Trust, National Association, asTrustee (filed as Exhibit 4.1 to the registrant’s Current Report on Form8-K filed on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein).

 

4.2Pooling and Servicing Agreement, dated as of August 1, 2015, by and amongCredit Suisse First Boston Mortgage Securities Corp., as Depositor, MidlandLoan Services, a Division of PNC Bank, National Association, as MasterServicer, Rialto Capital Advisors, LLC, as Special Servicer, PentalphaSurveillance LLC, as Operating Advisor, Wells Fargo Bank, National Association,as Certificate Administrator and Wells Fargo Bank, National Association, asTrustee (filed as Exhibit 4.2 to the registrant’s Current Report on Form8-K filed on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein).

 

4.3Co-Lender Agreement, dated as of August 18, 2015, by and among ColumnFinancial, Inc., as Initial Note A-1 Holder and Initial Note A-2 Holder (filedas Exhibit 4.3 to the registrant’s Current Report on Form 8-K filed onNovember 25, 2015 under Commission File No. 333-206703-01 and incorporated byreference herein)

 

31Rule 13a-14(d)/15d-14(d) Certifications.

 

33Reports on assessment of compliance with servicing criteria for asset-backedsecurities.

| 33.1 Wells Fargo Bank,   National Association, as Master Servicer                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 33.2 Midland Loan Services,  a Division of PNC Bank, National Association, as Special Servicer                                                                         |
| 33.3 Wilmington Trust,  National Association, as Trustee (Omitted. See Explanatory Notes.)                                                                             |
| 33.4 Wells Fargo Bank,  National Association, as Certificate Administrator                                                                                             |
| 33.5 Wells Fargo Bank,  National Association, as Custodian                                                                                                             |
| 33.6 Pentalpha Surveillance  LLC, as Operating Advisor                                                                                                                 |
| 33.7 CoreLogic Commercial  Real Estate Services, Inc., as Servicing Function Participant                                                                               |
| 33.8 National Tax Search,  LLC, as Servicing Function Participant                                                                                                      |
| 33.9 Midland Loan Services,  a Division of PNC Bank, National Association, as Primary Servicer of the  Arizona Grand Resort & Spa Mortgage Loan (see Exhibit 33.2) |
| 33.10 Rialto Capital Advisors,  LLC, as Special Servicer of the Arizona Grand Resort & Spa Mortgage Loan  (Omitted. See Explanatory Notes.)                        |
| 33.11 Wells Fargo Bank,  National Association, as Trustee and Certificate Administrator of the Arizona  Grand Resort & Spa Mortgage Loan (see Exhibit 33.4)        |
| 33.12 Wells Fargo Bank,  National Association, as Custodian of the Arizona Grand Resort & Spa  Mortgage Loan (see Exhibit 33.5)                                    |
| 33.13 Pentalpha Surveillance  LLC, as Operating Advisor of the Arizona Grand Resort & Spa Mortgage Loan  (see Exhibit 33.6)                                        |

 

34Attestation reports on assessment of compliance with servicing criteria forasset-backed securities.

| 34.1 Wells Fargo Bank,   National Association, as Master Servicer                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 34.2 Midland Loan Services,  a Division of PNC Bank, National Association, as Special Servicer                                                                         |
| 34.3 Wilmington Trust,  National Association, as Trustee (Omitted. See Explanatory Notes.)                                                                             |
| 34.4 Wells Fargo Bank,  National Association, as Certificate Administrator                                                                                             |
| 34.5 Wells Fargo Bank,  National Association, as Custodian                                                                                                             |
| 34.6 Pentalpha Surveillance  LLC, as Operating Advisor                                                                                                                 |
| 34.7 CoreLogic Commercial  Real Estate Services, Inc., as Servicing Function Participant                                                                               |
| 34.8 National Tax Search,  LLC, as Servicing Function Participant                                                                                                      |
| 34.9 Midland Loan Services,  a Division of PNC Bank, National Association, as Primary Servicer of the  Arizona Grand Resort & Spa Mortgage Loan (see Exhibit 34.2) |
| 34.10 Rialto Capital  Advisors, LLC, as Special Servicer of the Arizona Grand Resort & Spa Mortgage  Loan (Omitted. See Explanatory Notes.)                        |
| 34.11 Wells Fargo Bank,  National Association, as Trustee and Certificate Administrator of the Arizona  Grand Resort & Spa Mortgage Loan (see Exhibit 34.4)        |
| 34.12 Wells Fargo Bank,  National Association, as Custodian of the Arizona Grand Resort & Spa  Mortgage Loan (see Exhibit 34.5)                                    |
| 34.13 Pentalpha Surveillance  LLC, as Operating Advisor of the Arizona Grand Resort & Spa Mortgage Loan  (see Exhibit 34.6)                                        |

 

35Servicer compliance statements.

| 35.1 Wells Fargo Bank,   National Association, as Master Servicer                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 35.2 Midland Loan Services,  a Division of PNC Bank, National Association, as Special Servicer                                                                         |
| 35.3 Wells Fargo Bank,  National Association, as Certificate Administrator                                                                                             |
| 35.4 Midland Loan Services,  a Division of PNC Bank, National Association, as Primary Servicer of the  Arizona Grand Resort & Spa Mortgage Loan (see Exhibit 35.2) |
| 35.5 Rialto Capital  Advisors, LLC, as Special Servicer of the Arizona Grand Resort & Spa  Mortgage Loan (Omitted. See Explanatory Notes.)                         |
| 35.6 Wells Fargo Bank,  National Association, as Certificate Administrator of the Arizona Grand  Resort & Spa Mortgage Loan                                        |

 

99.1Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and Column Financial, Inc. (filedas Exhibit 99.1 to the registrant’s Current Report on Form 8-K filed onNovember 25, 2015 under Commission File No. 333-206703-01 and incorporated byreference herein)

 

99.2Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and Benefit Street Partners CREFinance LLC (filed as Exhibit 99.2 to the registrant’s Current Report onForm 8-K filed on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein)

 

99.3Mortgage Loan Purchase Agreement, dated as of November 1, 2015, among CreditSuisse First Boston Mortgage Securities Corp., Walker & Dunlop CommercialProperty Funding I CS, LLC and Walker & Dunlop Commercial Property Funding,LLC (filed as Exhibit 99.3 to the registrant’s Current Report on Form 8-Kfiled on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein)

 

99.4Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and The Bancorp Bank (filed asExhibit 99.4 to the registrant’s Current Report on Form 8-K filed onNovember 25, 2015 under Commission File No. 333-206703-01 and incorporated byreference herein)

 

99.5Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and MC-Five Mile CommercialMortgage Finance LLC (filed as Exhibit 99.5 to the registrant’s CurrentReport on Form 8-K filed on November 25, 2015 under Commission File No.333-206703-01 and incorporated by reference herein)

 

(b)The exhibits required to be filed by the Registrant pursuant to Item 601 ofRegulation S-K are listed above and in the Exhibit Index that immediatelyfollows the signature page hereof.

 

(c)Not Applicable.

 

**SIGNATURES**

 

Pursuant to the requirementsof Section 13 or 15(d) of the Securities Exchange Act of 1934, the registranthas duly caused this report to be signed on its behalf by the undersigned,thereunto duly authorized.

 

Credit Suisse First BostonMortgage Securities Corp.

(Depositor)

 

/s/ Patrick A. Remmert Jr.

Patrick A. Remmert Jr.,President 

(senior officer in charge ofsecuritization of the depositor)

 

Date: March 21, 2017

 

 

Exhibit Index

 

Exhibit No.

 

4.1Pooling and Servicing Agreement, dated as of November 1, 2015, by and amongCredit Suisse First Boston Mortgage Securities Corp., as Depositor, Wells FargoBank, National Association, as Master Servicer, Midland Loan Services, aDivision of PNC Bank, National Association, as Special Servicer, PentalphaSurveillance LLC, as Operating Advisor, Wells Fargo Bank, National Association,as Certificate Administrator and Wilmington Trust, National Association, asTrustee (filed as Exhibit 4.1 to the registrant’s Current Report on Form8-K filed on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein).

 

4.2Pooling and Servicing Agreement, dated as of August 1, 2015, by and amongCredit Suisse First Boston Mortgage Securities Corp., as Depositor, MidlandLoan Services, a Division of PNC Bank, National Association, as MasterServicer, Rialto Capital Advisors, LLC, as Special Servicer, PentalphaSurveillance LLC, as Operating Advisor, Wells Fargo Bank, National Association,as Certificate Administrator and Wells Fargo Bank, National Association, asTrustee (filed as Exhibit 4.2 to the registrant’s Current Report on Form8-K filed on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein).

 

4.3Co-Lender Agreement, dated as of August 18, 2015, by and among ColumnFinancial, Inc., as Initial Note A-1 Holder and Initial Note A-2 Holder (filedas Exhibit 4.3 to the registrant’s Current Report on Form 8-K filed onNovember 25, 2015 under Commission File No. 333-206703-01 and incorporated byreference herein)

 

31Rule 13a-14(d)/15d-14(d) Certifications.

 

33Reports on assessment of compliance with servicing criteria for asset-backedsecurities. 

| 33.1 Wells Fargo Bank,   National Association, as Master Servicer                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 33.2 Midland Loan Services,  a Division of PNC Bank, National Association, as Special Servicer                                                                         |
| 33.3 Wilmington Trust, National  Association, as Trustee (Omitted. See Explanatory Notes.)                                                                             |
| 33.4 Wells Fargo Bank,  National Association, as Certificate Administrator                                                                                             |
| 33.5 Wells Fargo Bank,  National Association, as Custodian                                                                                                             |
| 33.6 Pentalpha Surveillance LLC,  as Operating Advisor                                                                                                                 |
| 33.7 CoreLogic Commercial  Real Estate Services, Inc., as Servicing Function Participant                                                                               |
| 33.8 National Tax Search,  LLC, as Servicing Function Participant                                                                                                      |
| 33.9 Midland Loan Services,  a Division of PNC Bank, National Association, as Primary Servicer of the  Arizona Grand Resort & Spa Mortgage Loan (see Exhibit 33.2) |
| 33.10 Rialto Capital  Advisors, LLC, as Special Servicer of the Arizona Grand Resort & Spa  Mortgage Loan (Omitted. See Explanatory Notes.)                        |
| 33.11 Wells Fargo Bank,  National Association, as Trustee and Certificate Administrator of the Arizona  Grand Resort & Spa Mortgage Loan (see Exhibit 33.4)        |
| 33.12 Wells Fargo Bank,  National Association, as Custodian of the Arizona Grand Resort & Spa  Mortgage Loan (see Exhibit 33.5)                                    |
| 33.13 Pentalpha Surveillance  LLC, as Operating Advisor of the Arizona Grand Resort & Spa Mortgage Loan  (see Exhibit 33.6)                                        |
|                                                                                                                                                                   |   |

34Attestation reports on assessment of compliance with servicing criteria for asset-backedsecurities.

| 34.1 Wells Fargo Bank,   National Association, as Master Servicer                                                                                                      |
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| 34.2 Midland Loan Services,  a Division of PNC Bank, National Association, as Special Servicer                                                                         |
| 34.3 Wilmington Trust, National  Association, as Trustee (Omitted. See Explanatory Notes.)                                                                             |
| 34.4 Wells Fargo Bank,  National Association, as Certificate Administrator                                                                                             |
| 34.5 Wells Fargo Bank,  National Association, as Custodian                                                                                                             |
| 34.6 Pentalpha Surveillance LLC,  as Operating Advisor                                                                                                                 |
| 34.7 CoreLogic Commercial  Real Estate Services, Inc., as Servicing Function Participant                                                                               |
| 34.8 National Tax Search,  LLC, as Servicing Function Participant                                                                                                      |
| 34.9 Midland Loan Services,  a Division of PNC Bank, National Association, as Primary Servicer of the  Arizona Grand Resort & Spa Mortgage Loan (see Exhibit 34.2) |
| 34.10 Rialto Capital  Advisors, LLC, as Special Servicer of the Arizona Grand Resort & Spa  Mortgage Loan (Omitted. See Explanatory Notes.)                        |
| 34.11 Wells Fargo Bank,  National Association, as Trustee and Certificate Administrator of the Arizona  Grand Resort & Spa Mortgage Loan (see Exhibit 34.4)        |
| 34.12 Wells Fargo Bank,  National Association, as Custodian of the Arizona Grand Resort & Spa  Mortgage Loan (see Exhibit 34.5)                                    |
| 34.13 Pentalpha Surveillance  LLC, as Operating Advisor of the Arizona Grand Resort & Spa Mortgage Loan  (see Exhibit 34.6)                                        |
|                                                                                                                                                                   |   |

35Servicer compliance statements.

| 35.1 Wells Fargo Bank, National   Association, as Master Servicer                                                                                                      |
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| 35.2 Midland Loan Services,  a Division of PNC Bank, National Association, as Special Servicer                                                                         |
| 35.3 Wells Fargo Bank,  National Association, as Certificate Administrator                                                                                             |
| 35.4 Midland Loan Services,  a Division of PNC Bank, National Association, as Primary Servicer of the  Arizona Grand Resort & Spa Mortgage Loan (see Exhibit 35.2) |
| 35.5 Rialto Capital  Advisors, LLC, as Special Servicer of the Arizona Grand Resort & Spa  Mortgage Loan (Omitted. See Explanatory Notes.)                         |
| 35.6 Wells Fargo Bank,  National Association, as Certificate Administrator of the Arizona Grand  Resort & Spa Mortgage Loan                                        |

 

99.1Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between Credit SuisseFirst Boston Mortgage Securities Corp. and Column Financial, Inc. (filed asExhibit 99.1 to the registrant’s Current Report on Form 8-K filed onNovember 25, 2015 under Commission File No. 333-206703-01 and incorporated byreference herein)

 

99.2Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and Benefit Street Partners CREFinance LLC (filed as Exhibit 99.2 to the registrant’s Current Report onForm 8-K filed on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein)

 

99.3Mortgage Loan Purchase Agreement, dated as of November 1, 2015, among CreditSuisse First Boston Mortgage Securities Corp., Walker & Dunlop CommercialProperty Funding I CS, LLC and Walker & Dunlop Commercial Property Funding,LLC (filed as Exhibit 99.3 to the registrant’s Current Report on Form 8-Kfiled on November 25, 2015 under Commission File No. 333-206703-01 andincorporated by reference herein)

 

99.4Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and The Bancorp Bank (filed asExhibit 99.4 to the registrant’s Current Report on Form 8-K filed onNovember 25, 2015 under Commission File No. 333-206703-01 and incorporated byreference herein)

 

99.5Mortgage Loan Purchase Agreement, dated as of November 1, 2015, between CreditSuisse First Boston Mortgage Securities Corp. and MC-Five Mile CommercialMortgage Finance LLC (filed as Exhibit 99.5 to the registrant’s CurrentReport on Form 8-K filed on November 25, 2015 under Commission File No.333-206703-01 and incorporated by reference herein)