 The seven-story North and South Office Buildings are situated behind the capitol and overlook the East Wing. The South Office Building was renamed the K. Leroy Irvis Office Building on December 20, 2002, in recognition of former Speaker K. Leroy Irvis. The State Museum and State Archives buildings were constructed in 1964. A 640-by-320-foot (200 by 100 m) addition, called the East Wing, was dedicated on December 2, 1987. The East Wing replaced the decades-old parking lot and fulfilled Brunner's plan of a People's Court. It was built partially underground, such that the tallest point on the East Wing barely reaches the first floor of the capitol.
