Patriot Tower
Patriot Tower (formerly One Dallas Centre) is a modernist skyscraper located in the City Center District of downtown Dallas, Texas ( USA). The building rises 448 feet (137 meters). It contains 30 floors and was completed in 1979. One Dallas Center is currently tied with the Adam's Mark Hotel North Tower as the 25th-tallest building in the city. The building was originally planned as part of a three building complex designed by I.M. Pei & Partners; only one tower was constructed.

One Dallas Centre was announced by developer Vince Carrozza in 1977 as the first phase of a $200 million mixed-use development. Phase One included One Dallas Centre and the 500-space parking garage across Bryan Street. Two Dallas Centre, adjacent to the south of One Dallas Centre, was envisioned to include a 21 story, 500 room hotel atop 30 floors of office space. The third phase would have consisted of a 400 unit luxury apartment complex across Harwood Street, on land now occupied by the Sheraton Dallas Hotel convention facility. All phases of the development were to be connected by the expanded Dallas Pedestrian Network (Vincent Ponte, land planner for Dallas Centre, was also a city planning consultant for the pedestrian network). During construction in 1977 a crane fell 27 stories from the roof and crashed to the ground, killing a worker and injuring others; it also punched several holes in the side of the tower. One Dallas Centre opened in 1979, but additional phases of the development were never completed (although the building was connected to the Dallas Pedestrian Network). In 1985 The building was purchased by Trammell Crow, who owned a large share of adjacent office space at the time. It changed ownership again during the 1990s as nearby development made the building more attractive; adjacent Bryan Street was closed to auto traffic for DART's St. Paul Station, which opened in 1996. In 2007 Younan Properties Inc. purchased the building and changed the name to Patriot Tower. The company planned a $10 million renovation and addition of a war memorial museum in the building's lobby.

One Dallas Centre was designed by architect Henry N. Cobb of I.M. Pei & Partners to play with the site rather than fill the entire block. The building's diamond shape relates to the geometry of the city's diagonally intersecting street grids, specifically where nearby Live Oak Street intersects downtown's grid at a 30-degree angle. Placement of the building was carefully considered to relate to nearby structures and provide green space around building entrances. Two Dallas Centre, never constructed, was to be a chevron-shaped building also integrating unique angles. The two triangular notches on the sides of One Dallas Centre create added interest and provide four additional corner offices on each floor. The exterior of the building was designed with 2/3 of the facade covered in aluminum instead of highly reflective glass. This helps conserve energy while also complementing the style of the adjacent Republic Center.

Patriot Tower is the headquarters for Greyhound Bus Lines. Fourteen floors and 230,000 square feet of the building housed the Federal Deposit Insurance Corporation until 2002.