-rent it out for parking? (common where I live since most people are relegated to street parking)
-rent it out for people to store their junk/tools/lawnmower-type-of-things
-rent it out for an artist or craftsperson to use as their studio? (I have friends who are woodworkers and they are always needing more space to store wood, tools, and to work in)
-could you fix it up and rent it out on Airbnb? (probably not if it's not zoned to be an apartment, but maybe?)
-dance studio? (for self or others)
Hmmm, it's definitely an interesting problem to have... I'm curious to see what others suggest.