Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-208321 on Form S-8 and Registration Statement No. 333-213285 on Form S-3 of our reports dated February 11, 2019, relating to the consolidated financial statements and financial statement schedules of TIER REIT, Inc. and subsidiaries (which report expresses an unqualified opinion), and the effectiveness of TIER REIT, Inc.’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of TIER REIT, Inc. and subsidiaries for the year ended December 31, 2018.

/s/ Deloitte & Touche LLP

Dallas, Texas

February 11, 2019