The Laclede Gas Building is a 31-story, 122 m skyscraper located at 720 Olive Street in Downtown St. Louis, Missouri. It was designed by the Emery Roth & Sons architecture firm, and was built between 1967 and 1969 for the Laclede Gas Company, which had outgrown its 10-story building at 1017 Olive Street. The Laclede Gas Company vacated the building in March 2015, after 45 years in the space. The building has since been converted to mixed-use, and presently consists of both office and residential spaces. Uniquely, all power for the building is generated in-house using natural gas burning generators, and therefore is not interconnected to the Ameren power grid. The building also houses one of the eastbound entrances to MetroLink's 8th & Pine subway station.