The population of post-World War II Chula Vista tripled from 5,000 residents in 1940 to more than 16,000 in 1950. After the war, many of the factory workers and thousands of servicemen stayed in the area resulting in the huge growth in population. The last of the citrus groves and produce fields disappeared as Chula Vista became one of the largest communities in San Diego County. In 1949, the city limits of Chula Vista expanded for the first time. Due to the construction of the Montgomery Freeway the Arguello Adobe of Rancho La Punta was demolished.</ref> In 1955, the Big Ski Drive-In opened;</ref> until it closed in 1980, it was one of the largest drive-in theaters in the nation.</ref> By the 1960s, Chula Vista continued its expansion with the annexation of part of Bonita.</ref> That same decade, Filipinos and Mexicans began to move into Chula Vista in significant numbers; these included Filipino navy veterans. In 1963, Chula Vista became the second largest city in San Diego County. From 1960 to 2013, the South Bay Power Plant, a 700 megawatt four boiler plant, occupied of the Chula Vista waterfront.