After the Spanish conquest in the 1790s of Las Californias, the San Fernando Valley, including the "Toluca Lake locale", became the extended property of the Mission San Fernando Rey de España. After the 1823 Independence of Mexico, the secularization of missions in Alta California included the issuing of a Mexican land grant for Rancho Ex-Mission San Fernando. The extreme eastern end of the lake was within the 1843 Rancho Providencia grant to Vincente de la Osa. In 1862, Pío Pico sold his share of the Ex-San Fernando Mission land, the entire southern half of the Valley below Roscoe Boulevard, to Isaac Lankershim (operating as the San Fernando Farm Homestead Association) in 1869. In 1873, Isaac Lankershim's son, James Boon Lankershim, and future son-in-law, Isaac Newton Van Nuys, took over management of the property, including the lake at Toluca. During the 1880s, the San Fernando Farm Homestead Association was succeeded by the Los Angeles Farm &amp; Milling Company.