For the park, see Washington Square (Philadelphia). Washington Square West is a neighborhood in downtown, or Center City, Philadelphia, Pennsylvania.
Electric Door Strike (image from bigasterisk.com) A better solution for door security hardware during a power outage is to use electric strikes. An electric strike is a mechanically operated strike that releases a door when the mechanical part is activated.
Electric strike locks tend to be more expensive and more complicated to install as they require various components and wiring. Moreover, if the door can be opened with just the handle from the inside (rather than a release button) then it is impossible to track exits through the door on the access control system.