 After building High Ridge Park, a suburban corporate campus, in the 1960s, the F. D. Rich Company put up the city's tallest structure, Landmark Building, and the GTE building (now One Stamford Forum), both designed by Victor Bisharat.The Stamford Marriott (also Bisharat), with a revolving restaurant at the top, overlooking Long Island Sound, is another F. D. Rich landmark that changed the look of Downtown.In the 1980s Frank D. Rich III, Susan M. Rich and Thomas L. Rich joined the company playing major roles in the redevelopment of the city.