One day Kevin Flynn hacked himself a bunch of credits and used 'em to take over the top few floors of a residential skyscraper in Zone 05. He then moved in with most of the programs from the Grid, and anyone they happen to drag home with them.
No one remarks on the fact that Flynn lives with a bunch of very attractive men in skintight suits who seem unusually devoted to him, but someone probably should.
Zone 05 (Gibson)
The location is publicly known.
I dunno it's like three floors and there's a roof garden and a huge terrace with a pool. I'll fill in more detail later.