One Stamford Forum is an office building located in Stamford, CT. Looking like an upside-down ziggurat above its three-story parking garage, the building has an enclosed arboretum rising from the ninth floor to the penthouse roof, which is covered by 76 acrylic glass domes. Formerly the "GTE building" named after a former tenant, the 13-floor structure is 196 feet (60 m) high. GTE used to show off the building in numerous magazine advertisements. In the 1990s, the Tresser Boulevard entrance to the building was changed (in a design by Hellmuth, Obata & Kassabaum) from a "formidably stark concrete wall of a parking garage" to "a more inviting entrance ... clad in blue-gray ceramic tiles, with a lobby, canopy, colonnade and small garden." Building itself was designed by Victor Bisharat who also made St John's Towers in Stamford.