Exhibit 21 SUBSIDIARIES OF THE REGISTRANT Name State of Formation - ------------------------------------------------ ------------------ Connecticut Storage Fund........................ California PS Co-Investment Partners....................... California PS Illinois Trust............................... Delaware PS Insurance Company - Hawaii, Ltd.............. Hawaii PS Orangeco Holdings, Inc....................... California PS Orangeco, Inc............................... California PS Partners VIII, Ltd........................... California PS Partners, Ltd................................ California PS Texas Holdings, Ltd. ........................ Texas PSA Institutional Partners, L.P................. California PSAC Development Partners, L.P.................. California Public Storage Properties IV, Ltd............... California Public Storage Properties V, Ltd................ California Public Storage Institutional Fund............... California Public Storage Institutional Fund II............ California Public Storage Institutional Fund III........... California Public Storage Institutional Fund IV............ California Public Storage Pickup & Delivery, L.P........... California STOR-Re Mutual Insurance Corporation............ Hawaii Storage Trust Properties, L.P. ................. Delaware