GAC USA expansion continues with ground breaking of new Houston warehouse; Construction to start on LEED registered building in Central Green Business Park. GAC, a provider of integrated services to the shipping, logistics and marine industry, has announced the official start of construction of its new office and warehouse building in Houston's Central Green Business Park. GAC will consolidate its existing warehouses with the new LEED (Leader in Energy and Environment Design) registered 181,067 square-foot cross dock building which includes four acres of outside storage space.