The building is long gone but it had quite a colorful history.
Oddly, I've only ever found one photo of the inside of the building during its FDGH days. This is a photo of Stephen Gaskin during his Monday Nite Class which he described as,"...a weekly meeting of up to a thousand or fifteen hundred people where politics, religion, acid, sex, love, etc were discussed openly."
Photo by Robert Altman
This is the only picture I've ever found of the outside of the building
when it was the FDGH.
Looks like a pretty ordinary brick building but it had a rather grand history.
The building was erected in 1885 as the Ocean Beach Pavilion. It was
located down the hill from the famous Cliff House at the northern tip
of San Francisco right on the beach and it was used for concerts and
dancing. It's the building on the right in this photo from the 1890s.
Photo from The Cliff House Project
There are more photos of it at The Cliff House Project
It apparently operated that way until 1929 when it became a very
popular restaurant/nightclub named Topsy's Roost. You can see that the original mansard roofs at the tops of the corner towers are gone but other than all the signage on the front of it it still looks like the Ocean Beach Pavilion. And compare it with the Stephen Gaskin photo above. Looks like a much more happening scene in the 30s!
Photo/Postcard from Playland At The Beach
Check out the slides at the rear of the room. Patrons could slide down from their "coops" to the dance floor. Wheeeeooooo! There are many more similar pics at the awesome Playland at the Beach Site
During this period the hugely popular Playland was built across the
street - see the previous link (Google Playland and you'll find tons of info). It was torn down in '72 and now there are condos there :(
In the 1950s the old Pavilion building became "The Surf Club" which was apparently a dance club but I can't find much information about that. Around 1964 it became a slot car racetrack. Not much left of the grand old pavilion but it's definitely the same building - you can still see the remnants of the towers on the corners.
And then the FDGH. The FDGH opened summer of 1969 and closed in late 1970. At some point before 1972 it became the "Friends and Relationships Hall", another short-lived concert venue. There are a few posters for this venue
around, including this one w/ NRPS and Jerry on 6/3/71
(Thanks to The Jerry Site for the image)
In 1971 it was actually used as the headquarters for an oil spill
cleanup on Ocean Beach.
Finally, in 1972 it was torn down.
Photo from the San Francisco Public Library
(the building was next to Skateland)
By the way, there are a lot of sites that say the FDGH was Skateland
first. That's not correct - they were neighbors.
Here's how it looks today
photo from Google Street View