EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-203287 on Form S-3 and Registration Statement No. 333-212838 on Form S-8 of our reports dated February 12, 2018, relating to the financial statements and financial statement schedules of Alexander’s, Inc., and the effectiveness of Alexander’s, Inc.'s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Alexander’s, Inc. for the year ended December 31, 2017.

/s/ Deloitte & Touche LLP

Parsippany, New Jersey

February 12, 2018