[4] The master plan for Carthay Circle was designed by leading early 20th century architects Aleck Curlett and his partner Claud Beelman (designer of MGM Studios and Downtown LA's Eastern Columbia Building) in conjunction with landscape architects Cook & Hall (Wilbur D. Cook is also noted for creating the master plan for the neighboring city of Beverly Hills).

[2] Carthay Circle was one of the first planned communities in Los Angeles,[6] and the first in the city to feature underground utilities.

[8] On July 11, 1987, the neighborhood held a dedication ceremony to celebrate the planting of 100 trees and the installation of two large concrete monuments with the name "Carthay Circle" on them.

[13] Historical markers placed in the area by the Native Sons of the Golden West and Founders of Carthay Center include: Portolá Trail 1769, Juan Bautista de Anza, Daniel O. McCarthy, "Snowshoe" Thompson and Jedediah Strong Smith.

[14] The Carthay Circle Historic Preservation Overlay Zone (HPOZ) adopting ordinance became effective on July 24, 1998.