The Great Depression and World War II halted any further skyscraper construction until the 1950s when the Equitable Life Building (1955) and Crown-Zellerbach Building (1959) were completed. Many of San Francisco's tallest buildings, particularly its office skyscrapers, were completed in a building boom from the late 1960s until the late 1980s. During the 1960s, at least 40 new skyscrapers were built, and the Hartford Building (1965), 44 Montgomery (1967), Bank of America Center (1969), and Transamerica Pyramid (1972) each, in turn, took the title of tallest building in California upon completion. At tall, the Transamerica Pyramid was one of the most controversial, with critics suggesting that it be torn down even before it was completed.