I believe it is a steel building,,looks like it has insulation sprayed on the inside,,which is good, because they can sweat on hot days in the summer if not insulated.I've never seen a garage constructed like this before.
Is it made of concrete or fibreglass or something else?
Steel building kits.
It certainly looks to be a good size, but you know how it is, the more space you have the more junk you collect.
If you have empty space it is like a vacuum,,if you don't fill it up, chances are your neighbors or friends will.
Nice spot Keith!