While there are some folks who have lots of room for the toys, most don't. I share your concerns...we have the same problem.
Culling the herd so you don't need a big corral can be a difficult choice...especially given how hard it would be to replace them.
I have been looking for new storage space...tough to find.
Now you got me thinking again...
Maybe you can find a shared space with another hobbyist?? Paying rent and controlling the situation is better than worrying about the personal stuff with the old boss.
Given the crazy costs for building materials and the difficulty in finding a good contractor...a rental spot seems like a better choice. Then if you decide to sell a car or two....you won't be carrying the extra expanse of the new garage.
Good luck...
Tom