East Coast Realty has filed applications for a five-story, 10-unit residential building at 819 Lexington Avenue, located on the eastern end of Bedford-Stuyvesant. The project will measure 10,466 square feet and its residential units should average 748 square feet apiece, indicative of rentals. Forest Hills-based ARC Architecture + Design Studio is the architect of record. The 25-foot-wide, 2,500-square-foot lot is occupied by a single-story warehouse. Demolition permits have not been filed at this time.