It used to be an Auction Rooms, for both Dreweatts and BCVA, from what I recall. I went to my very first auction there, in fact, back when I had a year of "Artist Dates" in 2013.
I should start doing those again, now we're (hopefully) going to be able to go places more freely again.
GPS Coordinates:
51.44230, -2.61714
Location: Ashton Gate