
Wolfskill, son of Mathus (Mathius) Wolfskill, William's younger brother.

In 1884, Wilson sold Rancho San Jose de Buenos Ayres, at 2,000 acres (8 km²), to the nephew of leading pioneer William Wolfskill, businessman John W. In 1858, he sold it to Benjamin Davis Wilson, of early Pasadena development, the second Mayor of Los Angeles, and namesake for Mount Wilson in the San Gabriel Mountains. The first European on the land, that present day Holmby Hills, Bel Air, Westwood, and UCLA now occupy, was the Spanish soldier Maximo Alanis, who was the grantee of the 4,438-acre (18 km 2) Rancho San Jose de Buenos Ayres from a Mexican land grant issued by Alta California Governor Manuel Micheltorena in 1843. The area of present-day Holmby Hills was the homeland of the Tongva-Gabrieliño Native Americans, who had a presence in the region for over 8,000 years. The portion north of Sunset is the area east of Beverly Glen Boulevard and west of the city limits of Beverly Hills, with Greendale Drive and Brooklawn Drive as its northernmost streets it is located within the Bel Air– Beverly Crest Community Plan Area, though it is historically distinct from the neighborhoods of both Bel Air and Beverly Crest. With the expansion of Sunset Boulevard, Holmby Hills was split into northern and southern sections, each lying within a different community plan area designated by the City of Los Angeles: The portion south of Sunset Boulevard is the area north of Wilshire Boulevard and east of both Beverly Glen Boulevard and Comstock Avenue, and west of the Los Angeles Country Club it is located within the Westwood Community Plan Area. The neighborhood was developed in the early twentieth century by the Janss Investment Company, which developed the rest of Westwood as well as other Los Angeles neighborhoods. The portion north of Sunset is the area east of Beverly Glen Boulevard and west of the city limits of Beverly Hills, with Greendale Drive and Brooklawn Drive as its northernmost streets it is located within the Bel Air–Beverly Crest Community Plan Area, though it is historically distinct from the neighborhoods of both Bel Air and Beverly Crest.Holmby Hills is a neighborhood in the district of Westwood in the westside of Los Angeles, California, United States. The portion south of Sunset Boulevard is the area north of Wilshire Boulevard and east of both Beverly Glen Boulevard and Comstock Avenue, and west of the Los Angeles Country Club it is located within the Westwood Community Plan Area. With the expansion of Sunset Boulevard, Holmby Hills was split into northern and southern sections, each lying within a different community plan area designated by the City of Los Angeles. The Janss Investment Company tried to set themselves apart from their competition with subtle comparisons like touting Holmby Hills sites as offering elevated views "without steep grades" and by practicing discretion, with press releases rarely naming anyone who bought a lot. Letts kept a stake in the land but let the Janss family oversee development, a task they carried on after Letts died in 1923.

In 1919, Letts had purchased 3296 acres of what was Wolfskill Ranch and set aside 400 acres for an estate section that would become Holmby Hills, an area whose name he took from his family home in England and had already used in naming his grand Hollywood estate Holmby House. The neighborhood was developed in the early twentieth century by Arthur Letts Sr and the Janss Investment Company, who developed the rest of Westwood as well as other Los Angeles neighborhoods. Holmby Hills is bordered by the city of Beverly Hills on the east, Wilshire Boulevard on the south, Westwood on the west and Bel Air on the north. Holmby Hills, Bel Air and Beverly Hills form the "Platinum Triangle" of Los Angeles.
