The Merchandise Mart, St. Louis, MO, 63101. Bedrooms: 1-3. St. Louis' premier rental community located in the Washington Loft District offers one, two and three bedroom apartments with all the charm of historical architecture and the convenience of modern amenities. Our lofts feature exposed brick walls, maple hardwood floors, granite counter tops, maple cabinents, and 17 - 24 ft ceilings. Change your address, change your lifestyle. Merchandise Mart Apartments. 40% of this property is designated affordable housing which requires income limits. Please contact the leasing office for details.