Where is the address/venue/place that shows outdoor screenings, old
movies (Spaceballs), Potrero Hill neighborhood, roof of private
residence, San Francisco?

Dear larkchase,

The "Potrero Walk-In Movies" are shown on the private lot located at
the corner of 18th and Rhode Island Streets in Potrero Hill.

"Spaceballs", by the way, was shown there on 8 June.

They have their own website and you can contact them for additional information:

Phone: 408-406-4497
E-Mail: movies@walkinmovies.com
Website: http://www.walkinmovies.com/

Hope this helps!
Regards,
Scriptor



Sources:

Potrero Hill Neighborhood Blog: June 2005
http://www.potrerohillsf.com/2005_06_01_archive.html

Blogger Buzz: June 2005
http://buzz.blogger.com/2005_06_01_archive.html

Search terms used:
"Potrero Hill" spaceballs
://www.google.de/search?num=20&hl=de&newwindow=1&safe=off&c2coff=1&q=%22Potrero+Hill%22+spaceballs&btnG=Suche&meta=