
916 Geary North Beach The Sentinel Building, also known as Columbus Tower, sits at the corners of Columbus Avenue, Kearny Street and Jackson Street. The building is a classic Beaux-Arts flatiron. Flatiron buildings were structures built primarily between 1880 and 1926. Most flatirons were built in either the Beaux-Arts or Renaissance Revival architectural style that was popular at the time. These types of buildings are called flatirons because they are shaped like a flat clothes iron. This design is necessary for the trapezoid or triangular-shaped lots that are commonly found in 19th-and-20th century city grids. These odd-shaped lots appeared when Continue Reading




























