Brokerage in the field of real and personal property, namely, office buildings, furniture, and equipment, household furniture and equipment, printers, copiers, typewriters, computer hardware, communications equipment, cameras and projectors, food preparation and serving equipment, hardware, plumbing, heating and electrical equipment, jewelry and collectibles, art, medical and laboratory equipment, recreational and athletic equipment, clothing and tools, brokerage in the field of agricultural, mining and construction vehicles and machinery, cars, vans, trucks, boats, and airplanes; Real estate brokerage