UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

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o Preliminary Proxy Statement

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o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material Pursuant to §240.14a-12

Sunstone Hotel Investors, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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SUNSTONE HOTEL INVESTORS, INC. *** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on April 29, 2021. SUNSTONE HOTEL INVESTORS, INC. 200 SPECTRUM CENTER DRIVE 21ST FLOOR IRVINE, CA 92618 See the reverse side of this notice to obtain proxy materials and voting instructions. D32028-TBD You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. Meeting Information Meeting Type: Annual Meeting For holders as of: March 3, 2021 Date: April 29, 2021 Time: 12:30 PM PT Location: Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/SHO2021. The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/SHO2021 and be sure to have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page).

D32029-TBD Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 15, 2021 to facilitate timely delivery. How to View Online: Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET : www.proxyvote.com 2) BY TELEPHONE : 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line. NOTICE OF MEETING PROXY STATEMENT Proxy Materials Available to VIEW or RECEIVE: Vote By Internet: Before The Meeting: Go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. During The Meeting: Go to www.virtualshareholdermeeting.com/SHO2021. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. Before You Vote How to Access the Proxy Materials How To Vote Please Choose One of the Following Voting Methods

Voting Items 2. Ratification of the Audit Committee's appointment of Ernst & Young LLP to act as the independent registered public accounting firm for the fiscal year ending December 31, 2021. 3. Advisory vote to approve the compensation of Sunstone's named executive officers, as set forth in Sunstone's Proxy Statement for the 2021 Annual Meeting. NOTE: Transaction of such other business as may be properly brought before the Annual Meeting or any adjournment or postponement thereof. THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED HEREIN. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED "FOR" EACH OF THE NOMINEES IN PROPOSAL 1 AND "FOR" PROPOSALS 2 AND 3. THIS PROXY ALSO CONFERS DISCRETIONARY AUTHORITY ON THE PROXY HOLDERS TO VOTE AS TO ANY OTHER MATTER THAT IS PROPERLY BROUGHT BEFORE THE ANNUAL MEETING THAT THE BOARD OF DIRECTORS DID NOT HAVE NOTICE OF PRIOR TO MARCH 17, 2021. 1. Election of the following eight nominees to serve as directors until the next Annual Meeting and until their successors are elected and qualified: The Board of Directors recommends you vote FOR the following: The Board of Directors recommends you vote FOR proposals 2 and 3. 1b. W. Blake Baird 1a. John V. Arabia 1e. Kristina M. Leslie 1c. Andrew Batinovich 1d. Monica S. Digilio 1h. Douglas M. Pasquale 1f. Murray J. McCabe 1g. Verett Mims D32030-TBD

D32031-TBD