The Mercantile National Bank Building (known colloquially as The Merc) is a 31-story, 159.4 m (523 ft) skyscraper at 1700 Main Street in the Main Street district of downtown Dallas, Texas. It is the former home of the Mercantile National Bank, which later became MCorp Bank. The design of the skyscraper features Moderne styling from the Art Deco era and was designed by Walter W. Ahlschlager. The building has a series of setbacks that is crowned by an ornamental four-sided clock along with a decorative weather spire.