Exhibit 21

SUBSIDIARIES OF THE REGISTRANT

The Registrant’s principal subsidiaries are listed below. In addition, the Registrant has approximately 254subsidiaries that are not required to be listed pursuant to SEC rules.

Name	Location of Formation
PS LPT Properties Investors...................................	Maryland
Shurgard Storage Centers LLC...............................	Delaware

The Registrant directly or indirectly owns 100% of the subsidiaries listed above.