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Rossmoor is a planned census-designated place located in Orange County, California. As of the 2010 census, the CDP had a total population of 10,244, down from 10,298 at the 2000 census. In 2018, the US Census estimated the population to be 11,160. The gated Leisure World retirement community in the city of Seal Beach is to the south of Rossmoor, Los Alamitos is to the east and north, and Long Beach is to the west (on the other side of the San Gabriel River, the 605 freeway and the border with Los Angeles County). The community of Rossmoor has two shopping centers within its boundaries, but only one—the Rossmoor Village Square, is now within the political boundaries of the Rossmoor Community Services District. A larger shopping center, the Rossmoor Business Center, has been remodeled and renamed the Shops at Rossmoor; it was annexed, despite many protests, by the City of Seal Beach in 1967.
The Rossmoor community was developed from 1955 through 1961 by Ross W. Cortese, who had earlier developed the architecturally-significant Lakewood Rancho Estates in Long Beach (1953) and the Frematic Homes (1954) in Anaheim, just north and west of Disneyland. Cortese's original partners in securing the first large parcels of land that would become Rossmoor included California governor Goodwin Knight and Judge Alfred Gittelson, who had also partnered with him in the Lakewood Rancho Estates and the Frematic homes. (It was Gittelson who later agreed to annex his Rossmoor Shopping Center property to Seal Beach in the late 1960s.) After Rossmoor, Cortese would construct the first of his very successful Leisure World gated retirement community in that part of Seal Beach which is immediately south of Rossmoor. The Rossmoor community is easy to recognize because of its red brick "signature wall" that borders the entire unincorporated community.