The office had a section I didn't see at first. Whole other floor with a little apartment (that I paid a bit extra for) and the haxing area, and booze and snacks and such. The garage is small but multiple floors, though I still keep most of my cars in my main office.
The Dre stuff has been really fun so far. Everything has been challenging but doable solo. The only problems I've run into so far are:
The office I bought has broken roof doors, so if you use the helipad you have to just bail off the side of the building with a parachute.
Sometimes the important Franklin/Hackergirl in your ear gets drowned out by local noise.
Had a strange mission bit where a guy took off in a chopper and I was supposed to chase / bring it down, but there were no flyers nearby. There were fast cars but we were in twisty road vinewood hills, no way to chase something like that from a car no-matter how fast.
So no problem, I own every flavour of chopper / jet you name it. But since it is a "mission" it won't let you call for any of it. I had to chase the thing across half the world, ended up crashing in a swamp and having to walk for 10+ minutes.
The chopper landed on a boat. No problem! I own a big ass boat, mini sub, giant russian sub etc... nope, can't call for any of it. Had to just roam the coast till I found an abandoned jet ski.
You can't pet Chop!