A Brooklyn-based property owner has filed applications for a four-story, four-unit residential building at 4504 15th Avenue, located on the corner of 45th Street in Borough Park. The project will measure 9,328 square feet and its full-floor residential units should average 1,504 square feet apiece, indicative of family-sized apartments. Kenneth Thomas’s Rockland County, N.Y.-based firm is the architect of record. The 2,008-square-foot lot is occupied by a three-story house. Demolition permits have not been filed.