UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): August 6, 2021

Central Index Key Number of the issuing entity: 0001657889

Morgan Stanley Capital I Trust 2015-UBS8

(Exact name of issuing entity)

Central Index Key Number of the depositor: 0001547361

Morgan Stanley Capital I Inc.

(Exact name of registrant as specified in its charter)

Central Index Key Number of the sponsor: 0001541886

UBS Real Estate Securities Inc.

Central Index Key Number of the sponsor: 0001102113

Bank of America, National Association

Central Index Key Number of the sponsor: 0001541557

Morgan Stanley Mortgage Capital Holdings LLC

 (Exact names of sponsors as specified in their charters)

Registrant's telephone number, including area code: (212) 761-4000

Not applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company              ☐

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.    ☐

Item 8.01. Other Events.

Effective as of August 6, 2021, Situs Holdings LLC (“Situs Holdings”), a Delaware limited liability company, will act as special servicer for the Charles River Plaza North mortgage loan and each related pari passu and/or subordinate promissory note (collectively, the “Charles River Plaza North Non-Serviced Loan Combination”), replacing AEGON USA Realty Advisors, LLC as special servicer for such non-serviced loan combination. Situs Holdings was appointed at the direction of Prima Capital CRE Securitization 2015-V Ltd., the directing certificateholder of the CSAIL 2015-C3 securitization. As special servicer for the Charles River Plaza North Non-Serviced Loan Combination, Situs Holdings will be responsible for the servicing and administration of the Charles River Plaza North Non-Serviced Loan Combination if it becomes specially serviced (and the servicing and administration of any related REO property) and processing and performing certain reviews of material actions with respect to the Charles River Plaza North Non-Serviced Loan Combination when such non-serviced loan combination is not specially serviced. Servicing of the Charles River Plaza North Non-Serviced Loan Combination will continue to be governed by the CSAIL 2015-C3 pooling and servicing agreement, dated as of August 1, 2015.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: August 6, 2021