I'm kind of cheating as I don't own the building (I wish... it's over 190 units a few blocks away from one of the most desirable colleges in the world, so you can imagine what it's worth), but Ive lived here for almost a decade and have a master key. This building is slightly over a hundred years old and this part of it used to be the kitchen and seating area for a lunch counter, so it's divided into a couple sections.
First room is where I sit and smoke joints and drink coffee, and also where I do flat ground in the winter because the other rooms are always freezing. There's enough room to take one push and pop, or start in the other room and do powerslides across the room when it gets really dusty
Second room is where I keep some of my stuff and also where I try to figure out why I suck. It has perfect concrete except for one crack that's right before where I want to pop.
Third room is the big guy. Don't have anything set up right now but I sometimes build ramps and had a shitty brick curb set up at one point. There's a lot of room and the ceiling is high, but it's also old and crumbling so combined with the broken tile you almost have to skate wide wheels in there. I've gotten pitched by a chunk of masonry more times than I can count. I like just popping on some tunes and taking something with soft wheels and loose trucks and just weaving through the pillars sometimes too. I honestly don't skate in there that much anymore because you absolutely have to sweep the shit out of it and it takes forever.
I also have to consider the noise. Rooms one and two are below my apartment and a Dr's office that hasnt had a patient since the pandemic started so I can skate in there pretty much whenever. The big room stretches across 4 units which are all occupied by students. I try to be respectful since it's definitely loud enough to disturb someone who's trying to sleep or study and I tend to skate early in the morning.