 As of May 2020, The Mercian is the tallest building, outside of London and Manchester, under construction in the United Kingdom.When completed, it will be the second tallest building in Birmingham, after the BT Tower, and will be the tallest building on the street.However, two other approved high-rises for the city, 100 Broad Street and One Eastside, are expected to surpass the height of The Mercian.