re-purposed as a hotel. The Scanlan Building, at Main and Preston, was built on the site of the first official "White House" of the Republic of Texas. Constructed in 1909 by the daughters of Thomas Howe Scanlan to honor their father, former mayor of Houston (1870–1873). The Scanlan Building is listed in the U.S. National Register of Historic Places and was the largest building in the city at the time of its construction. Demographics In 2017 the Downtown Super Neighborhood #61, which includes Downtown and East Downtown, had 12,879 people. 34% were non-Hispanic White, 28% were Hispanic, 32% were non-Hispanic Black, 4% were non-Hispanic Asians, and 2% were non-Hispanic people of other racial identities. In 2015 there were 12,407 residents. 33% were non-Hispanic White, 32% were non-Hispanic Black, 29% were Hispanic, 5% were non-Hispanic Asian, and 1% were non-Hispanics of other racial identities. In 2000 there were 12,407 residents. 5,083 (41%) were non-Hispanic Black, 4,225 (34%) were non-Hispanic White, 2,872 (23%) were Hispanic, 156 (1%) were non-Hispanic Asians, 56 were of two or more races, 11 were non-Hispanic American Indian, and two each were non-Hispanic Native Hawaiian and non-Hispanic people of other racial identities. Economy Downtown is Houston's single largest office market, containing of space. A premium submarket, Downtown commands the highest office rental rates in the city and was one of the ten most expensive office markets in the United States in 2016. Louisiana Street, which runs through the heart of the district, is one of the fifteen most expensive streets in the United States. 3,500 businesses in the district employ approximately 150,000 workers. Major employers include Chevron, JPMorgan Chase, and United Airlines. Downtown Houston has between 35% and 40% of the Class A office locations of the business districts in Houston. Companies based in Downtown Firms which are headquartered in Downtown include: Calpine Dynegy in Wells Fargo Plaza KBR Baker Botts in One Shell Plaza Bracewell LLP in Pennzoil Place Total Petrochemicals USA in Total Plaza CenterPoint Energy in CenterPoint Energy Plaza Vinson & Elkins in First City Tower Waste Management in First City Tower El Paso Corp. Plains All American Pipeline in Allen Center Enterprise GP Holdings in Enterprise Plaza EOG Resources in Heritage Plaza Companies with operations in Downtown Continental Airlines (now known as United Airlines) formerly had its headquarters in Continental Center I. At one point, ExpressJet Airlines had its headquarters in Continental's complex. In