 From 1857 to 1860 it was a station on that road for the San Antonio-San Diego Mail Line between San Diego and Vallecito via San Pasqual, Santa Ysabel Asistencia, Warner's, and Rancho Valle de San Felipe.It operated as a ranch until 1962, when real estate developer Irvin Kahn acquired the 14,000 acre parcel with the intent of building a 150,000 resident planned community.As of the census of 2010, there were 51,536 people, 17,009 households, and 14,093 families residing in the community.