37 Construction project management services; Building maintenance services, namely, cleaning, maintaining and repairing nonporous surfaces including stone, metal, concrete and grout; Construction of Bridges; Construction of Tunnels; Construction of Power Plants; Construction of Water Plants; Construction of High Rise Commercial Buildings; Construction of Malls, Construction of Roads; Construction of Factories; Construction and installation of plumbing; Installation and replacement service for heating, ventilating and air conditioning systems; Installation, maintenance and repair of telecommunications networking hardware, apparatus, and instruments; Electrical repairs, maintenance, and installation of electrical wiring, outlets, light fixtures, and electrical panels