UNITED STATESSECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

(Amendment No. 1)

(Mark One)

xANNUAL REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2017or

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _____ to _____Commission file number of the issuing entity: 333-191331-07

Central Index Key Number of the issuing entity: 0001630477

GS Mortgage Securities Trust 2015-GC28

(exact name of the issuing entity as specified in its charter)

Central Index Key Number of the depositor: 0001004158

GS Mortgage Securities Corporation II

(exact name of the depositor as specified in its charter)

Central Index Key Number of the sponsor: 0001541502

Goldman Sachs Mortgage Company

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

Central Index Key Number of the sponsor: 0001558761

Cantor Commercial Real Estate Lending, L.P.

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

Central Index Key Number of the sponsor: 0001682511

Starwood Mortgage Funding I LLC

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

Central Index Key Number of the sponsor: 0001541001

Citigroup Global Markets Realty Corp.

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

Central Index Key Number of the sponsor: 0001576832

MC-Five Mile Commercial Mortgage Finance LLC

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



New York(State or other jurisdiction ofincorporation or organization
of

   the issuing entity)

   38-3952073

   38-3952074

   38-7127895

   (I.R.S. Employer

   Identification Numbers)


c/o Wells Fargo Bank, National Association

as Certificate Administrator

9062 Old Annapolis Road

Columbia, MD

(Address of principal executive offices of the issuing entity)

21045

(Zip Code)

Registrant’s telephone number, including area code:

(212) 902-1000

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

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

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.oYes⌧No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.oYes⌧No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.⌧YesoNo

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required
to be submitted and posted pursuant to Rule 405 of Regulation 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 post such files).

Not applicable.

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

Not applicable.

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

Large accelerated fileroAccelerated filero

Non-accelerated filer⌧(Do not check if a smaller reporting company)
                            Smaller reporting
companyo

Emerging growth companyo

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or
revised financial accounting standards provided pursuant to Section 13(a) of the Exchange
Act.o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).oYes⌧No

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

Not applicable.

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange
Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.oYesoNo

Not applicable.

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

Not applicable.

DOCUMENTS INCORPORATED BY REFERENCE



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

Not applicable.






The purpose of this Amendment No. 1 (the “Amendment”) to our Annual Report on Form 10-K for the fiscal year ended December 31, 2017 filed with the
Securities and Exchange Commission (the “Commission”) on March 23, 2018 (the “Original 10-K”) is to file with the Commission a report on assessment of compliance with servicing criteria of Berkeley Point Capital LLC, as primary
servicer, as Exhibit 33.9 as a replacement of the report on assessment of compliance with servicing criteria filed as Exhibit 33.9 to the Original 10-K.

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 Analysis of Financial Condition and Results of Operations.

Omitted.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Omitted.

Item 8. Financial Statements and Supplementary Data.

Omitted.

Item 9. Changes in and Disagreements With Accountants 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 Corporate Governance.

Omitted.

Item 11. Executive Compensation.

Omitted.

Item 12. Security Ownership of Certain Beneficial Owners 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 Obligor Financial Information.

The Airport Technology Park Mortgage Loan (Control Number 1 on Annex A of the prospectus supplement of the registrant relating to the issuing entity filed on
February 27, 2015 pursuant to Rule 424(b)(5)) constitutes a significant obligor within the meaning of Item 1101(k)(2) of Regulation AB as disclosed in the prospectus supplement. In accordance with Item 1112(b) of Regulation AB, the most recent unaudited
net operating income of the significant obligor was $13,386,648.00 for the twelve–month period ended December 31, 2017.

Item 1114(b)(2) of Regulation AB, Significant Enhancement Provider Financial Information.

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

Item 1115(b) of Regulation AB, Certain Derivatives Instruments (Financial Information).

No entity or group of affiliated entities provides any derivative instruments or other support for the certificates within this transaction as described under
Item 1115 of Regulation AB.

Item 1117 of Regulation AB, Legal Proceedings.

The registrant knows of no material pending legal proceeding involving the trust or any party related to the trust, other than routine litigation incidental to
the duties of those respective parties, and the following, with respect to Wells Fargo Bank, National Association, as certificate administrator and custodian:



On June 18, 2014, a group of institutional investors filed a civil complaint in the Supreme Court of the State of New York, New York County, against Wells Fargo
Bank, N.A. (“Wells Fargo Bank”) in its capacity as trustee under 276 residential mortgage backed securities (“RMBS”) trusts, which was later amended on July 18, 2014, to increase the number of trusts to 284 RMBS trusts. On
November 24, 2014, the plaintiffs filed a motion to voluntarily dismiss the state court action without prejudice. That same day, a group of institutional investors filed a putative class action complaint in the United States District Court for the
Southern District of New York (the “District Court”) against Wells Fargo Bank, alleging claims against the bank in its capacity as trustee for 274 RMBS trusts (the “Federal Court Complaint”). In December 2014, the
plaintiffs’ motion to voluntarily dismiss their original state court action was granted. As with the prior state court action, the Federal Court Complaint is one of six similar complaints filed contemporaneously against RMBS trustees (Deutsche
Bank, Citibank, HSBC, Bank of New York Mellon and US Bank) by a group of institutional investor plaintiffs. The Federal Court Complaint against Wells Fargo Bank alleges that the trustee caused losses to investors and asserts causes of action based upon,
among other things, the trustee's alleged failure to: (i) notify and enforce repurchase obligations of mortgage loan sellers for purported breaches of representations and warranties, (ii) notify investors of alleged events of default, and (iii) abide by
appropriate standards of care following alleged events of default. Relief sought includes money damages in an unspecified amount, reimbursement of expenses, and equitable relief. Other cases alleging similar causes of action have been filed against Wells
Fargo Bank and other trustees in the District Court by RMBS investors in these and other transactions, and these cases against Wells Fargo Bank are proceeding before the same District Court judge. A similar complaint was also filed May 27, 2016 in New
York state court by a different plaintiff investor. On January 19, 2016, an order was entered in connection with the Federal Court Complaint in which the District Court declined to exercise jurisdiction over 261 trusts at issue in the Federal Court
Complaint; the District Court also allowed plaintiffs to file amended complaints as to the remaining, non-dismissed trusts, if they so chose, and three amended complaints have been filed. On December 17, 2016, the investor plaintiffs in the 261 trusts
dismissed from the Federal Court Complaint filed a new complaint in New York state court (the “State Court Complaint”). In September 2017, Royal Park Investments SA/NV (“Royal Park”), one of the plaintiffs in the District Court
cases against Wells Fargo Bank, filed a putative class action complaint relating to two trusts seeking declaratory and injunctive relief and money damages based on Wells Fargo Bank’s indemnification from trust funds for legal fees and expenses
Wells Fargo Bank incurs or has incurred in defending the District Court case filed by Royal Park. With respect to the foregoing litigations, Wells Fargo Bank believes plaintiffs' claims are without merit and intends to contest the claims vigorously, but
there can be no assurances as to the outcome of the litigations or the possible impact of the litigations on Wells Fargo Bank or the RMBS trusts.

Item 1119 of Regulation AB, Affiliations and Certain Relationships and Related Transactions.

The information regarding this Item has been previously provided in a prospectus supplement of the Registrant relating to the issuing entity filed on February
27, 2015 pursuant to Rule 424(b)(5).

Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria.

The reports on assessments of compliance with the servicing criteria for asset-backed securities and related attestation reports on such assessments of
compliance with respect to the mortgage loans are attached hereto under Item 15 to this Annual Report on Form 10-K. Attached as Exhibit O to the Pooling and Servicing Agreement incorporated by reference as Exhibit 4 to this Annual Report on Form 10-K is
a chart identifying the entities participating in a servicing function for the transaction responsible for each applicable servicing criteria set forth in Item 1122(d).

Item 1123 of Regulation AB, Servicer Compliance Statement.

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

PART IV

Item 15. Exhibits, Financial Statement Schedules

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

(1) Not applicable

(2) Not applicable

(3) See below



4
Pooling and Servicing Agreement, dated as of February 1, 2015, by and among GS
Mortgage Securities Corporation II, as Depositor, Wells Fargo Bank, National Association, as Master Servicer, Rialto Capital Advisors, LLC, as Special Servicer, Pentalpha Surveillance LLC, as Operating Advisor, Wells Fargo Bank, National Association, as
Certificate Administrator and Wilmington Trust, National Association, as Trustee (filed as Exhibit 4 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and incorporated by reference
herein).

10.1
Mortgage Loan Purchase Agreement, dated as of February 1, 2015, between GS
Mortgage Securities Corporation II and Goldman Sachs Mortgage Company (filed as Exhibit 10.1 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and incorporated by reference
herein)

10.2
Mortgage Loan Purchase Agreement, dated as of February 1, 2015, between GS
Mortgage Securities Corporation II and Cantor Commercial Real Estate Lending, L.P. (filed as Exhibit 10.4 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and incorporated by
reference herein)

10.3
Mortgage Loan Purchase Agreement, dated as of February 1, 2015, between GS
Mortgage Securities Corporation II and Starwood Mortgage Funding I LLC (filed as Exhibit 10.3 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and incorporated by reference
herein)

10.4
Mortgage Loan Purchase Agreement, dated as of February 1, 2015, between GS
Mortgage Securities Corporation II and Citigroup Global Markets Realty Corp. (filed as Exhibit 10.2 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and incorporated by reference
herein)

10.5
Mortgage Loan Purchase Agreement, dated as of February 1, 2015, between GS
Mortgage Securities Corporation II and MC-Five Mile Commercial Mortgage Finance LLC (filed as Exhibit 10.5 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and incorporated by
reference herein)

10.6
Primary Servicing Agreement, dated as of February 1, 2015, by and between Wells
Fargo Bank, National Association, as Master Servicer, and Berkeley Point Capital LLC, as Primary Servicer (filed as Exhibit 10.6 to the registrant’s Current Report on Form 8-K filed on February 27, 2015 under Commission File No. 333-191331-07 and
incorporated by reference herein)

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

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

33.1
Wells Fargo Bank, National Association, as Master Servicer (filed as Exhibit
33.1 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.2
Rialto Capital Advisors, LLC, as Special Servicer (filed as Exhibit 33.2 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.3
Wilmington Trust, National Association, as Trustee (Omitted. See Explanatory
Notes to the Original 10-K.)

33.4
Wells Fargo Bank, National Association, as Certificate Administrator (filed as
Exhibit 33.4 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.5
Wells Fargo Bank, National Association, as Custodian (filed as Exhibit 33.5 to
the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.6
Pentalpha Surveillance LLC, as Operating Advisor (filed as Exhibit 33.6 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.7
CoreLogic Commercial Real Estate Services, Inc., as Servicing Function
Participant (filed as Exhibit 33.7 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.8
National Tax Search, LLC, as Servicing Function Participant (filed as Exhibit
33.8 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

33.9
Berkeley Point Capital LLC, as Primary Servicer

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

34.1
Wells Fargo Bank, National Association, as Master Servicer (filed as Exhibit
34.1 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.2
Rialto Capital Advisors, LLC, as Special Servicer (filed as Exhibit 34.2 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.3
Wilmington Trust, National Association, as Trustee (Omitted. See Explanatory
Notes to the Original 10-K.)

34.4
Wells Fargo Bank, National Association, as Certificate Administrator (filed as
Exhibit 34.4 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.5
Wells Fargo Bank, National Association, as Custodian (filed as Exhibit 34.5 to
the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.6
Pentalpha Surveillance LLC, as Operating Advisor (filed as Exhibit 34.6 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.7
CoreLogic Commercial Real Estate Services, Inc., as Servicing Function
Participant (filed as Exhibit 34.7 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.8
National Tax Search, LLC, as Servicing Function Participant (filed as Exhibit
34.8 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

34.9
Berkeley Point Capital LLC, as Primary Servicer (filed as Exhibit 34.9 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

35            Servicer compliance statements.

35.1
Wells Fargo Bank, National Association, as Master Servicer (filed as Exhibit
35.1 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

35.2
Rialto Capital Advisors, LLC, as Special Servicer (filed as Exhibit 35.2 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

35.3
Wells Fargo Bank, National Association, as Certificate Administrator (filed as
Exhibit 35.3 to the Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

35.4
Berkeley Point Capital LLC, as Primary Servicer (filed as Exhibit 35.4 to the
Original 10-K under Commission File No. 333-191331-07 and incorporated by reference herein)

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

(c)    Not Applicable.



SIGNATURES

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

GS Mortgage Securities Corporation II(Depositor)

/s/ Leah Nivison


Leah Nivison, Chief Executive Officer

(senior officer in charge of securitization of the depositor)

Date: August 3, 2018