Another Alley but not in Shaw.
These photos are from a government agency that was for getting rid of residential alley dwellings.
Looking a this page you may see a familiar local name, Pohanka. I don’t know if they were selling cars, but they were repairing them.
If it was located around E, F, 20th and 21st Streets NW, it should be in the West End. However, poking around Property Quest, I could not locate a Square 762. I’ll post another page about O’Brien Ct which has a different square number that makes more sense.
This is from 1935. It mentions a Thimble Court.