Great Website for Historic Theater Research!
I found this site by accident while searching for general theater information. There seems to be plenty of information, though most of it is general. I spend a few hours on it a day and still haven’t gotten to the end of it.
The list seems to be extensive and very interesting. The site allows you to cross reference the addresses of the theaters in Philadelphia with the Board of Revisions of Taxes website. The tax site allows you to see who currently owns the properties and if they’re still operating as theaters.
The list is not exclusively Philadelphia theaters. I think they list them by project type, so there are theaters across the country that pop up on it. A great starting point for research of historic theaters. I’m going to post the site address in the Links section also.