It's a hard thing to find. We tried a year or two back to get a large scale open space going for mopeds, but honestly it was just too much of a commitment for some people, so we stayed in a smaller shop.
Finding a single bay garage with power is not too hard, I rent one for myself in addition to being part of our group shop in BedStuy. Finding roll-up garage space bigger than a single is getting harder though.
We've had the best luck walking around and calling local spots vs. CL for some reason.