From an FAA website: "October 1948..The Dade County Port Authority broke ground for this facility in June 1947; however, construction progressed very slowly and the tower was not turned over to the Civil Aeronautics Administration (CAA) until late 1948. The most unique feature of this tower is that it later became number 7, after it had to be moved due to construction to lengthen Runway 9L/27R. It was relocated to an area adjacent to the 20th Street Terminal, a building used largely by non-scheduled air carriers. Today that area is immediately off the end of Concourse "F"."