Established in 1961, Patterson-Schwartz Real Estate is one of the largest real estate service firms. It offers a variety of services, such as residential home sales, purchase and rental; relocation services; and property management. It has developed a tool for the homeowners services, Home-Link. The company operates the Patterson-Schwartz Foundation, which supports local charitable causes, including social services, health care research, youth programs and garden clubs. The company employs more than 350 full-time sales associates. It operates Gilpin Mortgage, which provides assistance to homebuyers and financers about the home loan process. Patterson-Schwartz Real Estate is headquartered in Hockessin, Del., and has various offices in Greenville, Newark, Middletown and Willmington, Del; Elkton, Md.; and Kennett Square, Pa.