Devon Energy Tower, also known as Two Allen Center, is a 521 ft (159 m) tall skyscraper in Houston, Texas. It was completed in 1978 and has 36 floors. It is the 24th tallest building in the city. The tower houses offices for Oklahoma City-based Devon Energy Corporation. The building has travertine flooring and is Energy Star labelled. It is owned by Brookfield Properties. It was known as the Citicorp Building in 1989. During that year Exxon had office space there. Greater Houston Partnership has its offices in Suite 700, on the seventh floor.