Real estate development; construction services, namely, planning, laying out, management supervision and construction of commercial and industrial facilities; installation of equipment, namely, incinerators, medical equipment, medical gas systems, research laboratory equipment, medical laboratory equipment, wet and dry HVAC systems, plumbing systems and fixtures, electrical distribution equipment, electrical systems, lighting and lighting control systems, refrigerators and coolers, food service equipment, laundry equipment, loading dock equipment, fire or smoke alarm and suppression systems, audio-visual equipment, theater and stage rigging, elevators, escalators, lightning protection, material handling systems, trash and recycling equipment, fitness equipment, postal equipment, demountable partition systems, furniture systems, leak detection systems, water softening systems, fuel oil systems, energy generation and storage machinery and systems, instrumentation and control systems, access flooring systems, uninterruptible power systems, and water and wastewater treatment machinery and systems, all for commercial and industrial facilities