Understand man!!! The Garage can be fixed, I did one less than 4 months ago that was really leaning. I bought 6- 2x4 by 12 feet long and a ladder and my nailer.
Took my work truck and backed up with a 2x8 on my tailgate and another 2x8 along the side of leaning Pisa!
Backed up about 3 inches beyond level and nailed those studs inside to hold the structure together.
It worked! As I pulled up the garage shifted about 2 inches and within the next 2 months should go to level.
About 90 minuets of work, but it worked!!!!!
Roofing issues generally just need some of that Black roofing product that comes in a caulking tube cost about $6. Find where it is coming in and caulk away. use plenty, roofers are not cheap.
If your windows are wood and have water damage so they don't work well, i would replace as budget is available. Window contractors charge about $300 a window and the window is in their bid!
Hopefully you will move forward. A property can make you some serious money ( equity) especially now. Real Estate market is hot throughout the nation.
If the roof line is pretty level, the property does not have major structure problems. If the doors and windows work good than the structure is pretty good.