The BT Tower, formerly known as the Post Office Tower and the GPO Tower, is a landmark and telecommunications tower in Birmingham, England. It is the tallest structure in the city. Its post office code was YBMR. History The first microwave telecommunications relay in Birmingham, set up in 1949, utilised a metal tower on the roof of Telephone House, a 1930s building near to the eventual site of the BT Tower, and also on Lionel Street. Construction of the BT Tower commenced in July 1963 and was completed in September 1965. The tower became operational in December 1966 and was officially opened by the Lord Mayor of Birmingham, Alderman James S. Meadows, on 5 October 1967. It was designed by the Ministry of Public Building and Works and M.H. Bristow was the senior architect. It has 26 storeys, housing technical areas and offices, and five levels of circular aerial galleries at the top. There is a roof-mounted crane. The original intention was to build a circular tower similar to the London one but without the public floors above the aerial galleries. At one time the Post Office wanted to increase the height from , which had been agreed by the Ministry of Aviation, to . This was refused in order to avoid non-standard procedures for aircraft approaching Birmingham Airport from the north-west. Cost over-runs on the London tower led to a review of the Birmingham design, and then it was decided to use a circular design of the 'Chilterns' type as used at Stokenchurch, Charwelton, Pye Green, Sutton Common, Heaton Park and Tinshill radio stations, but with the internal diameter increased from to to provide sufficient space on the equipment floors. The square design, as built, was proposed for aesthetic reasons by the Chief Architect of the Ministry of Public Building and Works. The tower was designed to be stable in high winds. Channels at each corner funnel the wind to counteract the force of the wind swaying the structure. A stable platform is necessary so that the microwave dishes mounted on the side of the structure keep line of sight with the remote transmitter they are communicating with. There were two steel rails on one wall on which a trolley was designed to run to carry the dishes up to the aerial galleries. The original horn dishes were too heavy for the roof mounted crane to lift and had