Room 30A measures 3 x 2.9 m and is identical to 30B in architecture. Six strata were defined including post-occupational units, roof fall, and a floor unit. Room 30A featured two burned floors. Three features were found in Room 30A, including a milling bin, a storage bin, and a wall separating Rooms 30A and 30B. No door was found between these rooms and entrance probably came through a rooftop hatch. Room 30A functioned as milling room to process corn.