37 Maintenance of commercial properties; maintenance of public utilities facilities for others; fleet maintenance and repair; maintenance of heating and air conditioning systems, including heating, steam generating, and coal burning systems; airfield maintenance, namely, repair and maintenance of runways, air control towers and fire and crash equipment; airfield construction services, namely, runway and taxiway paving, runway improvements and air control tower construction; grounds maintenance; golf course maintenance; pier maintenance; sewer maintenance and repair services; maintenance and repair of water tanks; building maintenance and repair, namely maintenance and repair of office buildings, hospitals, apartments and condominiums, schools, universities, hotels, motels, industrial facilities, libraries, shopping centers, churches, auto shops, dry docks, water tanks, and firefighter practice pits; sign painting and sign repair; janitorial and cleaning services; paving contractor services; building construction and repair services, namely, partial and complete rehabilitation of buildings and airport runways; new construction of buildings, runways, piers, railroads and airline towers; building demolition; lead paint and asbestos abatement; and pest control