The Fine Arts Building in Chicago's Loop is beautiful. It houses a theater, a ballet studio, luthiers, music teachers, a bookstore, a sheet music store, and various others. Rents are pretty reasonable. The elevators are all manually operated.
Absolute experience for me was just taking the elevator to the sheet music store and then walking down the stairs and reading the signs of the various renters on each floor. Music classes, instrument shops, so much culture in a single building.
Sounds like paradise. And sheet music stores are increasingly rare.