Old Tile Floor

I was in an old building on Van Ness. I visit periodically and have never been able to figure out the story of this building. It now houses part of California Pacific, a guitar/drum store, Ruth’s Chris Steak House and a car dealership. Where I go has no second floor – only 1, 3, and 4. I can’t figure out where 2 is. The other puzzle is this lovely floor. It is simple, but the tiles are old. They may be pre-1906 as the building is on the side of the street that wasn’t dynamited, but I can’t say for sure. I may have to delve deeper
Was this the entry way of a mansion that has been so obliterated that you would never know it? Was it the offices of a car dealership that no longer exists? I don’t know, but I like the tiles.