At 227 Warren Street in Cobble Hill, the 20.75-foot-wide house is set up with an owner’s triplex above a one-bedroom garden rental. Included in the sale is a deeded parking spot a few blocks away.

At 439 Hicks Street, the structure is part of the Cobble Hill Towers, a red-brick property developed by philanthropist Alfred Tredway White as housing for the working poor. The complex of six-story ...