The Old Colony Building is 17-story landmark building in the Chicago Loop community area of Chicago, Illinois. Designed by the architectural firm Holabird & Roche in 1893-94, it stands at approximately 215 feet and was the tallest building in Chicago at the time it was built. The building was designated a Chicago Landmark on July 7, 1978. It was the first tall building to use a system of internal portal arches as a means of bracing the structure against high winds.