Exhibit 21.1

Subsidiaries of Orion Office REIT Inc.
Entity NameJurisdiction of Formation/Incorporation
Orion Office REIT LPMaryland
Orion Office REIT LP LLCMaryland
Orion Office REIT Services LLCMaryland
Orion TRS Inc.Maryland
Orion Office Systems LLCDelaware
CLF Sawdust Member LLCDelaware
Orion Sierra Vista AZ LLCDelaware
Orion El Centro CA LLCDelaware
Orion Redding CA LLCDelaware
Orion New Port Richey FL LLCDelaware
Orion Augusta GA LLCDelaware
Orion Cedar Rapids IA LLCDelaware
Orion Cedar Falls IA LLCDelaware
Orion Sioux City IA LLCDelaware
Orion Caldwell ID LLCDelaware
Orion Deerfield IL 1 LLCDelaware
Orion Deerfield IL 2 LLCDelaware
Orion Deerfield IL 3 LLCDelaware
Orion Deerfield IL 4 LLCDelaware
Orion Deerfield IL 5 LLCDelaware
Orion Deerfield IL 6 LLCDelaware
Orion Minneapolis MN LLCDelaware
Orion St Charles MO LLCDelaware
Orion Malone NY LLCDelaware
Orion Columbus OH LLCDelaware


Exhibit 21.1
Orion Dublin OH LLCDelaware
Orion Uniontown OH LLCDelaware
Orion Salem OR LLCDelaware
Orion Harleysville PA LLCDelaware
Orion Memphis TN LLCDelaware
Orion Knoxville TN LLCDelaware
Orion Brownsville TX 1 LLCDelaware
Orion Brownsville TX 2 LLCDelaware
Orion Paris TX LLCDelaware
Orion Eagle Pass TX 1 LLCDelaware
Orion Dallas TX LLC (DE)
Delaware
Orion Bedford TX LLCDelaware
Orion Eagle Pass TX 2 LLCDelaware
Orion Parkersburg WV LLCDelaware
Realty Income Providence LaSalle Square, LLCDelaware
Realty Income Buffalo Grove Deerfield, LLCDelaware
Realty Income East Windsor SciPark, LLCDelaware
Realty Income East Syracuse Fair Lakes, LLCDelaware
ARC ATMTPSC001, LLCDelaware
ARC ESSTLMO001, LLCDelaware
ARC TITUCAZ001, LLCDelaware
Orion Phoenix AZ LLCDelaware
Orion Longmont CO LLCDelaware
Orion Denver CO LLCDelaware
Orion Cocoa FL LLCDelaware
Orion Grangeville ID LLCDelaware
Orion Schaumburg IL LLCDelaware


Exhibit 21.1
Orion Indianapolis IN LLCDelaware
Orion Lawrence KS 1 LLCDelaware
Orion Lawrence KS 2 LLCDelaware
Orion Berkeley MO LLCDelaware
Orion Blair NE LLCDelaware
Orion Lincoln NE LLCDelaware
Orion Amherst NY LLCDelaware
Orion Tulsa OK LLCDelaware
Orion Oklahoma City OK LLCDelaware
Orion Nashville TN LLCDelaware
Orion Fort Worth TX LLCDelaware
Orion Irving TX LLCDelaware
Orion Plano TX LLCDelaware
Orion Sterling VA LLCDelaware
Orion Milwaukee WI LLCDelaware
ARCP GSPLTNY01, LLCDelaware
ARC HRPWARI001, LLCDelaware
KDC Norman Woods Business TrustVirginia
CLF Fresno Business TrustVirginia
CLF Lakeside Richardson LLCDelaware
CLF Farinon San Antonio LLCDelaware
CLF Cheyenne Tulsa, LLCDelaware
CLF Pulco Two LLCDelaware
CLF Ridley Park Business TrustVirginia
CLF VA Ponce LLCDelaware
CLF Lakeside Richardson LLCDelaware
CLF Sierra, LLCDelaware


Exhibit 21.1
CLF Pulco One LLCDelaware
CLF Westbrook Malvern Business TrustVirginia
ARC HRPBPAB002, LLCDelaware
ARC HRPBPAA001, LLCDelaware
ARCP OFC Annandale NJ, LLCDelaware
ARCP OFC Covington KY, LLCDelaware
ARCP OFC Dublin OH, LLCDelaware
ARCP OFC Malvern PA, LLCDelaware
ARCP OFC Schaumburg IL, LLCDelaware
257 W. Genesee, LLCNew York
Cole OF Urbana MD, LLCDelaware
Cole OF Nashville TN, LLCDelaware
Cole OF Kennesaw GA, LLCDelaware
Cole OF Glenview IL, LLCDelaware
Cole OF Duluth GA, LLCDelaware
Cole OF Parsippany NJ, LLCDelaware
Cole OF Bedford MA, LLCDelaware
Cole OF Hopewell Township NJ, LLCDelaware