I’m surprised it hasn’t been mentioned yet but canvas buildings are a great option. Most communities consider them temporary so they aren’t taxed.
This summer is purchased a ShelterLogic 14x32 while they were on sale. The frame is surprisingly robust once assembled. Some of the bolt holes in the pipes were drilled crooked, made it a bit of a pain.
The canvas was a bit disappointing, pretty much just a tarp, but the way they attach it to the frame is a great idea. There were also some holes cut in the wrong area that the pipe frame laces through. I had to make a few in the correct locations.
I laid a tarp on the ground with rail road ties at the base of the perimeter of the building. The frame was lag screwed to the ties. I fit 4 cars in there, decently. 1 gbody, a extended cab s-10, a reg cab s-10 and a Eagle talon. Then I ratchet strapped the building to each vehicle for additional wind protection.
In the end, I could put sheets on the vehicles if I felt the need. There is plenty of air movement too. Outside of rodents, I feel this may be better storage than a garage with a sweaty floor in the summer.
I don’t anticipate the buildings cover to last more than a year or two and you do need enough room to clear the snow from the sides as it slides off and piles up at the base.
In a year or two I will likely cover it with metal roofing.
