Filed by Equity Commonwealth

(Commission File No.: 001-09317)

Pursuant to Rule 425 of the Securities Act of 1933, as amended

Subject Company: Monmouth Real Estate Investment Corporation

(Commission File No.: 001-33177)

As previously disclosed, the virtual special meeting of shareholders of Equity Commonwealth (“EQC”) previously scheduled to be held on August 17, 2021 at 10:00 a.m., Eastern Time, has been rescheduled for August 24, 2021 at 10:00 a.m., Eastern Time. An updated proxy card reflecting the new date is filed herewith.

If you have any questions about the merger or how to submit your proxy, please contact EQC’s proxy solicitor D.F. King & Co., Inc., at (877) 783-5524.

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