Here is an unique way to take a look. It won't tell you who/what is there, but these aerial views can get interesting:
http://www.terraserver.com/http://imageatlas.globexplorer.comYou might also contact the San Francisco Library via the Ask-A-Librarian service and have them look up the address in the Reverse Directory:
http://sfpl.lib.ca.us/sfplonline/asklibrarian.htmIf the service doesn't work, call the SF Main Library-Newspaper Desk (that's where the actual directories are) and see if they will do it for you.