Orion Office REIT Inc

Amendment to Revolving Credit Agreement

On May 3, 2024, Orion Office REIT Inc. (the “Company”), as parent, and its operating partnership, Orion Office REIT LP (“Orion OP”) as borrower, entered into a third amendment (the “Third Amendment”) to their credit agreement with Wells Fargo Bank National Association, as Administrative Agent, and the lenders party thereto (as amended, the “Credit Agreement”).

Under the terms of the Third Amendment, Orion OP and the lenders agreed to reduce the borrowing capacity of the Company’s senior revolving credit facility (the “Revolving Facility”) to $350.0 million, from $425.0 million, and to certain financial covenant changes, including a proportional reduction in the minimum unencumbered asset value that must be maintained by Orion OP to $500.0 million, from $600.0 million.

The Administrative Agent and other lenders under the Revolving Facility or their affiliates are also agents and forward purchasers under the Company’s “at the market” offering program for its common stock.

The above descriptions of the Third Amendment and the Credit Agreement do not purport to be complete and are qualified in their entirety by reference to the full text of the Third Amendment (including the copy of the Credit Agreement attached thereto), which is attached as Exhibit 10.1 to this Quarterly Report on Form 10-Q, and incorporated by reference herein.

Rule 10b5-1 Trading Agreements

During the three months ended March 31, 2024, none of our directors or officers (as defined in Rule 16a-1(f) of the Exchange Act)adopted orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(c) of Regulation S-K.