EX-21 7 ex21.txt LIST OF SUBSIDIARIES EXHIBIT 21 List of Subsidiaries The following sets forth the subsidiaries of the Registrant and their respective states of incorporation or organization: Name State American Office Park Properties, TPGP, Inc. California PSBP QRS, Inc. California Hernmore, Inc. Maryland AOPP Acquisition Corp. Two California Tenant Advantage, Inc. California PS Business Parks, L.P. California TPLP Office Park Properties Texas PSBP Northpointe D, L.L.C. Virginia PSBP Monroe, L.L.C. Virginia Monroe Parkway, L.L.C. Virginia Metro Park I, L.L.C. Delaware Metro Park II, L.L.C. Delaware Metro Park III, L.L.C. Delaware Metro Park IV, L.L.C. Delaware Metro Park V, L.L.C. Delaware