Building # 4: 1. Demolition: east vertical window opening wall, staircase wall, roof insulation and waterproof layer, etc. 2. New: some metal stairs from the ground floor to the top floor, some additional layers on the ground floor, roof thermal insulation and waterproof layer, parapet handrail, light partition wall; East facade exterior wall window; Reconstruction of men's and women's toilets, part of the external wall groove buckle aluminum plate, cement decorative plate, U-260 glass external wall, gray