My dad had a garage built in the 50s after he left the Chevy dealer he worked for. Exxon, put a Tiger in your tank. Block building, two bays, one a wash bay with a 5' devider wall and the other with a lift. Office and counter space to the side with stoage room, compressor behind for hoses, belts, wiper blades and such.
Best time of my life and the first car I worked on was a '28 model A that our family doctor owned. He also had an XKE Jag convertible with a 6 cylinder, 4 speed. I learned to drive in the model A. Also where I learned the Trade. Dad would ask for a wrench, and if I gave him the wrong one, he would throw it back at me. Doesn't take long to figure a 9/16" from a 1/2" bolt head when you get hit by the wrong wrench. LOL
Wouldn't take too much money or time to build a fifties style garage,IMHO.