I haven't been to the Museum yet, I don't like the French guy that hangs around outside the front LOL. Apparently the full history is available there, at least according to a YouTube video I watched. That video was quite interesting, it mentioned that IBM and the CIA used to have offices down on Patpong.
Bar stool talk says it was a Chinese guy named Fat Fong who bought the land many moons ago and made it what it is now. But for the life of me I don't understand why the family haven't razed it to the ground and put up an office building or condos or something. That's prime real estate isn't it, it's got be worth heaps (billions? I'm not sure about Silom land values).
A Thaniya-style revamp would be nice but as you said, seems like the landlord is absent and is happy with the rental income so we're stuck with the dilapidated bars and the stench of stray cats for now ????