Mount Stuart Square is a residential and commercial square in Cardiff, Wales. It is located in the Butetown area of the city. Originally developed in the late 1800s as a residential location for nearby dock workers, it quickly became a centre for upscale residential properties which revolved around the main square. By 1900, commercial activity had taken its place, dominated by the Coal Exchange, which occupied the once open central space. The square contains a high concentration of listed buildings, which represent a range of architectural styles and some of Cardiff’s finest examples of late 19th and early 20th Century commercial architecture. Mount Stuart Square area was designated as a Conservation Area in July 1980.