The Transamerica Pyramid is the tallest skyscraper in the San Francisco, California
skyline and one of its most iconic. Although the building no longer houses the headquarters of the Transamerica Corporation, it is still strongly associated with the company and is depicted in the company's logo. Designed by architect William Pereira and built by Hathaway Dinwiddie Construction Company, at 260 m (850 ft), upon completion in 1972 it was among the five tallest buildings in the world. Columbus Tower, also known as the Sentinel Building is a mixed-used building in San Francisco, California completed in 1907. The distinctive copper-green Flatiron style structure. Photo by Carol Highsmith.