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, it is the tallest building in the city and second tallest building in Missouri. Major tenants include law firms Bryan Cave and Evans & Dixon, the Bi-State Development Agency and Greater St. Louis Inc. 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 DJI Phantom quadcopter drone crashed into the building.