Completed in 1988 and 1991, the 34-story towers are officially Concourse Corporate Center V and VI, but are known locally as "the King and Queen towers" because their white lattice crowns resemble the heads of chess pieces. The squared-top "king" tower (Corporate Center VI) is on the immediate east side of 400, the round arcs of the "queen" tower (Corporate Center V) are in turn immediately east of it. At 173.7 metres (570 ft) and 168.6 metres (553 ft) to their spire tops, these are the two tallest suburban buildings in the United States, and 14th and 17th in metro Atlanta (including The Atlantic, 13th).[1] Within Perimeter Center, they are followed by Three Ravinia Drive in Dunwoody, and Park Towers II and I in Sandy Springs (seen in the above picture at left), the only others to be true skyscrapers over 100 metres (330 ft). https://en.wikipedia.org/wiki/Concourse_at_Landmark_Center