Carol and Cindy's Hospital in "Coming Out Party"

The very brief establishing shot of Carol and Cindy's hospital in "Coming Out party" is King Gillette Ranch, located in Calabasas. It was clearly  stock footage that was then used in many other shows, including “Laverne & Shirley" and “The Powers of Matthew Starr”

In 1971 the Mannix episode “Days Beyond Recall” filmed a scenes at the location.

Thanks to Reel to Reel's The Brady Bunch Filming Locations, check out their great site:

Reel to Real Filming Locations