general contracting services in the fields of building construction, electrical systems, electronic and mechanical building control systems, plumbing and HVAC systems; installation, maintenance and repair of refrigeration systems and water treatment systems; commercial building maintenance and repairs; building construction services, namely, providing specialized construction and applications for clean rooms, computer rooms, research labs, and medical and testing facilities

engineering; energy analysis, namely, engineering services in the field of energy efficiency; fabrication services, namely, testing, analysis and quality control for others; computer aided graphic design, namely, preparing computer aided design drawings for others; computer modeling services, namely, computer simulation from computer programs for others for use in providing building information modeling services and computer simulation animations to project energy usage, cost estimates, quantity schedules, area charts, material specifications and phasing schedules