Kensington was founded in 1910 when a map was filed on April 9, 1910. The map contains the name of two sisters who owned the land which became the Kensington Park subdivision. Abby (Hall) Hitchcock and Mary (Hall) Gleason inherited the ex-Rancho Mission land from the estate of their deceased brother and mother. Abby's husband was a realtor, and her brother-in-law was a land use attorney and early mover-and-shaker in San Diego. Through the Hitchcock brothers, a connection was made to William Douglas, a real estate promoter from Los Angeles. Douglas' name also appears on the original Kensington Park map.