MainPlace is a 630 ft (192 m) tall skyscraper under construction in Downtown Houston, Texas. It will be completed in 2010 and have 46 floors. It has been pre-certified Silver LEED. When it is completed MainPlace will become the 15th tallest building in Houston and will feature a skygarden on the 39th floor. It is the tallest building built in Houston in 23 years, after the Heritage Plaza was completed in 1987.