One City Centre

Downtown is the largest central business district in the city of Houston and the largest in the state of Texas, located near the geographic center of the metropolitan area at the confluence of Interstate 10, Interstate 45, and Interstate 69. The 1.84-square-mile (4.8 km2) district, enclosed by the aforementioned highways, contains the original townsite of Houston at the confluence of Buffalo Bayou and White Oak Bayou, a point known as Allen's Landing. Downtown has been the city's preeminent commercial district since its founding in 1836. Today home to nine Fortune 500 corporations, Downtown contains 50 million square feet (4,600,000 m2) of office space and is the workplace of 150,000 employees. Downtown is also a major destination for entertainment and recreation. Nine major performing arts organizations are located within the 13,000-seat Theater District at prominent venues including Alley Theatre, Hobby Center for the Performing Arts, Jones Hall, and the Wortham Theater Center. Two major professional sports venues, Minute Maid Park and the Toyota Center, are home to the Houston Astros and Houston Rockets, respectively. Discovery Green, an urban park located on the east side of the district adjacent to the George R. Brown Convention Center, anchors the city's convention district. Downtown is Houston's civic center, containing Houston City Hall, the jails, criminal, and civil courthouses of Harris County, and a federal prison and courthouse. Downtown is also a major public transportation hub, lying at the center of the light rail system, park and ride system, and the metropolitan freeway network; the Metropolitan Transit Authority of Harris County (METRO) is headquartered in the district. Over 100,000 people commute through Downtown daily. An extensive network of pedestrian tunnels and skywalks connects a large number of buildings in the district; this system also serves as a subterranean mall. Geographically, Downtown is bordered by East Downtown to the east, Third Ward to the south, Midtown to the southwest, Fourth Ward to the west, Sixth Ward to the northwest, and Near Northside to the north. The district's streets form a strict grid plan of approximately 400 square blocks, oriented at a southwest to northeast angle. The northern end of the district is crossed by Buffalo Bayou, the banks of which function as a linear park with a grade-separated system of hike-and-bike trails.

The City National Bank Building, located at 1001 McKinney Avenue in Houston, Texas, was listed on the National Register of Historic Places on April 3, 2000.

First City Tower, located at 1001 Fannin, is a skyscraper in downtown Houston, Texas. The building rises 662 feet (202 m) in height. Completed in 1981, it contains 49 floors. First City Tower currently stands as the 14th-tallest building in the city. The architectural firm who designed the building was Morris-Aubry, and was built by W. S. Bellows Construction Corporation. The structure is an example of late-modernist architecture. The tower, which formerly housed the headquarters of the now-defunct First City National Bank, now serves as the global headquarters of Waste Management, Inc, and the headquarters of Vinson & Elkins. It also houses the U.S. headquarters of Campus Living Villages.The building, with Class A office space, has 1,300,000 square feet (120,000 m2) of office space. The building is noted for its distinctive "staircase cuts" on the north and south facades, and is composed mostly of aluminum and green-tinted glass. These designs were designed to represent the letter "F" for the building's developer and first major tenant, First City Bank, which was itself founded by attorneys of the international law firm Vinson & Elkins. First City Tower was constructed in a diagonal rotation away from Houston's main north–south street grid, which gives the impression that the structure has a larger footprint than it actually does.

The Kirby Lofts is an 11-story building at 917 Main Street in Downtown Houston, Texas, currently consisting of apartments with retail on the ground floor, originally built in 1926 and designed by Alfred C. Finn, a noted Houston-based architect.

1000 Main, formerly Reliant Energy Plaza, is a 518-foot (158 m) tall skyscraper in Downtown Houston, Texas managed by Transwestern. It houses the headquarters of GenOn Energy, and the building has around 800,000 square feet (74,000 m2) of space.1000 Main was constructed from 2001 to 2003 and has 36 floors. It is the 25th tallest building in Houston. It is made out of glass, steel, and concrete. Lights atop the building and on the main street side flash in patterns of various colors at night. This building occupies the site where the Lamar Hotel stood before it was demolished in 1985. A two-level trading floor with 30 ft high ceilings, currently leased by the trading arm of Shell plc, is located on the 10th and 11th floors. It is squeezed between the garage and the office tower. Century development built the Reliant Energy Plaza. In 2003 Reliant Energy occupied more than 500,000 square feet (46,000 m2) of space in the building. During the same year two subsidiaries of Marsh & McLennan Companies, Marsh USA and Mercer Human Resource Consulting, had a combined 105,000 square feet (9,800 m2) of space in the building. The Reliant Energy Plaza was 86% leased in 2003.

Main Street Square is a station on the METRORail Red Line in Houston, Texas (USA). This originally was the 3rd station heading south along the rail line and is in the heart of downtown. There are many shopping areas and offices nearby. The station is located on Main Street in Downtown Houston and has two separate platforms. The northbound platform is located between the Walker and McKinney Streets, while the southbound platform is located between Lamar and Dallas Streets. These two platforms are divided by the Main Street Square fountain.

The Consulate-General of Japan in Houston (在ヒューストン日本国総領事館, Zai Hyūsuton Nippon-koku Sōryōjikan) is Japan's diplomatic facility in Houston, Texas, United States. It is located in Suite 3000 at 2 Houston Center, which is located at 900 Fannin Street in Downtown Houston. The consulate serves Texas and Oklahoma.As of 2020 the consul general is Hideo Fukushima (福島 秀夫, Fukushima Hideo).

Houston Center is a retail and office complex in Downtown Houston, Texas, United States. It is owned by Brookfield Property Partners and Spear Street Capital, LLC, and operated separately by Jones Lang LaSalle (JLL) and Brookfield Property Management. The three towers in Houston Center have almost 3,400,000 square feet (320,000 m2) of Class A office space. The buildings in Houston Center include: LyondellBasell Tower (formerly 1 Houston Center) 2 Houston Center Fulbright Tower (formerly 3 Houston Center) 4 Houston Center 5 Houston Center (individually owned) The Shops in Houston Center (formerly The Park Shops) The Shops, built in 1982, is an enclosed shopping mall. Four Seasons Hotel Houston

The Stowers Building is located at 820 Fannin Street in downtown Houston. The building was constructed in 1913 and is listed on the National Register of Historic Places (NRHP). The building is named for George Arthur Stowers and his furniture company, which had moved into the new "skyscraper" after a fire at his Main Street store. The local firm of Green & Finger designed the ten-story building which was constructed out of reinforced steel by Pearson & Co. The building was representative of a period of skyscraper construction in Houston between 1908 and 1913. It is listed on the National Register of Historic Places.

The Bender Hotel was a ten-story building in Downtown Houston on Main Street at the corner of Walker. It was later known as the San Jacinto Hotel, and later repurposed as an office building before it was demolished.

811 Main (formerly BG Group Place and MainPlace) is a 630 ft (192 m) tall skyscraper in Downtown Houston, Texas. It was completed in February 2011 and has 46 floors. It is LEED Platinum Certified. When it was completed, BG Group Place became the 15th tallest building in Houston and features 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. The naming was done when BG Group Plc became an anchor tenant and leased 164,000sq ft of space. The primary monument & all core signage for the facility was built by Ad Display Sign Systems. Current major tenants include: Crestwood Midstream Partners KPMG Baker Hostetler Latham & Watkins Quorum Citi Kayne Anderson Reed Smith

GreenStreet, formerly known as Houston Pavilions, is a commercial development in Downtown Houston, Texas, United States. Construction was scheduled to begin in Spring 2006, with the first developments opening in the fourth quarter of 2007. The project possesses an estimated cost of $200 million and is expected to contain almost 560,000 square feet (50,000 m2) of space, including 360,000 square feet (33,000 m2) of retail space in the first two levels of the development. The project covers three 1.4-acre (5,700 m2) city blocks. As of November 16, 2006, 50% of the retail space had been leased. 200,000 square feet (19,000 m2) of loft office space will be available on the mid-block between Fannin and San Jacinto Streets. Office parking will be provided in the Houston Pavilions' 1,675 garage located on the corner of Main and Polk.The project was developed by Texas Real Estate Trust, Inc. and Entertainment Development Group, who also developed the Denver Pavilions in Denver, Colorado. Geoffrey Jones and William Denton served as the co-developers of the project. The designers were Laguarda.Low Architects from Dallas. To finance the development, developers obtained a construction loan from North Houston Bank, an $8.8 million development grant for infrastructure improvements from the city of Houston, and $5.5 million from Harris County. The Houston Chronicle reported that the Pavilions will provide around 1,800 to 2,000 full- and part-time jobs. The Houston Pavilions office tower, which is 11 stories tall, is named the NRG Tower, after its main tenant.