So this was my dad's house, and the garage was built by my stepfather who was a mechanic. He retired and sold the house to my dad who lived in it for a few years. My dad passed away recently, and everything is trending towards me buying my sister out of her half of the house and moving us in.
I will end up loosing access to about half the garage though. Prior to him passing, him and my uncle started converting one of the front bays (the one on the left in the first pic) and the loft into a separated apartment for him to live in. I said I'd still be fine with that plan continuing on, he's family. I just warned him he might want to factor in some sound proofing
So I would still have the bay on the right, the back bay with the lift, and that lower roofed back section... still plenty of room to turn it into a bitchin' garage. He planned on using a dual zone mini-split in the apartment section for heat and A\C, I said I'd be willing to kick in some money as well to go with a 3 or 4 zone system, so I can have one in the 'main' area to cool it in the summer as well. The apartment plans also include installing dormers on the non-solar side of the roof; he (my uncle) planned on sinking $100k - $150k into the renovation. Since he's paying out of his pocket putting equity into a house he doesn't own, the agreement was he wouldn't be paying 'rent' per se, but splitting the utilities\taxes\insurance. So still a win.