One Metropolitan Square, also known as Met Square, is an office skyscraper completed in 1989, located in downtown St. Louis, Missouri. At 180.7 m (593 ft), it is the tallest building in the city and second tallest building in Missouri.
The building was designed by the architectural firm Hellmuth, Obata and Kassabaum and was constructed by McCarthy Building Companies, Inc., the largest general contractor in St. Louis. In early May, 2014, a DJIPhantom quadcopter drone crashed into the building.[5][6]