Mercantile National Bank Building 1800 Main Street, Dallas, TX 75201

The Mercantile National Bank Building, also known as The Merc, is a 31-story skyscraper located at 1800 Main Street in downtown Dallas, Texas. Designed by Walter W. Ahlschlager in the Art Deco style, it was completed in 1943 and was the tallest building west of the Mississippi River at the time. The building features a unique four-sided clock tower and ornamental weather spire.

Originally the home of Mercantile National Bank, the building later became MCorp Bank. During World War II, it was the only major skyscraper constructed due to a special waiver allowing for its completion. The lobby showcases the largest Art Deco wood murals in the world.

The complex includes several buildings such as the Mercantile Securities Building and the Mercantile Dallas Building, all interconnected by tunnels and walkways. In 2005, Forest City Enterprises renovated the main tower into residential apartments with ground floor retail space. The adjacent Element building was also constructed, along with a pool and plaza for residents.

The iconic clock tower and ornamental spire serve as a landmark in downtown Dallas, with large clock faces and LED lights displaying weather information. The building has been a significant part of the city's skyline for decades, symbolizing the city's history and architectural heritage.