1 EXHIBIT 21.1 AMERICAN INDUSTRIAL PROPERTIES REIT NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED) Entity: American Industrial Properties REIT, a Texas real estate investment trust Ownership Percentage Subsidiary/Partner ------------------ ---------------------------------------------------------------- 100% American Industrial Properties REIT, Inc., a Maryland corporation 100% AIP Tamarac, Inc., a Texas corporation 99% Limited Partner AIP Properties #1, L.P., a Delaware limited partnership 100% AIP Properties #3, GP, Inc., a Texas corporation 99% Limited Partner AIP Properties #3, L.P., a Delaware limited partnership 98% Limited Partner AIP-SWAG Operating Partnership, L.P., a Delaware limited partnership 99% AIP Operating, L.P., a Delaware limited partnership 100% DDR Office Flex I, LLC, an Ohio Limited Liability Company 100% DDR Office Flex II, LLC, an Ohio Limited Liability Company 100% AIP/Battlefield GP, Inc., a Texas Corporation 100% AIP/Greenbrier GP, Inc., a Texas Corporation 100% AIP/Post Office GP, Inc., a Delaware corporation 49% Limited Partner DDR/Post Office L.P., a Delaware corporation 85.5% Limited Partner DDR/Tech 29 Limited Partnership 55.84% Joint Venture USAA Chelmsford Associates Joint Venture ENTITY: AIP TAMARAC, INC., A TEXAS CORPORATION Ownership Percentage Partner - ---------------------- -------------------------------------------------------------------- 1% General Partner AIP Properties #1, L.P., a Delaware limited partnership ENTITY: AIP NORTHVIEW, INC., A TEXAS CORPORATION Ownership Percentage Partner - ---------------------- --------------------------------------------------------------------- 1% General Partner AIP Properties #2, L.P., a Delaware limited partnership ENTITY: AIP PROPERTIES #3 GP, INC., A TEXAS CORPORATION Ownership Percentage Partner - ---------------------- -------------------------------------------------------------------- 1% General Partner AIP Properties #3, L.P., a Delaware limited partnership 2 ENTITY: AIP SWAG GP, INC., A TEXAS CORPORATION Ownership Percentage Partner - ---------------------- -------------------------------------------------------------------- 98% General Partner AIP-SWAG Operating Partnership, L.P., a Delaware limited partnership ENTITY: AIP/POST OFFICE GP, INC., A DELAWARE CORPORATION Ownership Percentage Partner - ---------------------- -------------------------------------------------------------------- 1% General Partner DDR/Post Office L.P., a Delaware corporation