The economics of the town shifted from purely agrarian to a commercial greenhouse base; much of the flower and vegetable needs of Boston were met from the Belmont 'hothouses' which persisted until about 1983 when Edgar's, the last large greenhouse firm in the area, closed. Other commercial enterprises in Belmont included mining clay and waste management. The reclamation of a large dump and quarry off Concord Avenue into sites for the Belmont High School and the Clay Pit Pond stands as a lasting example of environmental planning. With the introduction of automobiles and highways, Belmont continued its transition to a commuter-based suburb throughout the twentieth century.