1789, Georgetown University features a mix of Romanesque and Gothic Revival architecture. The Ronald Reagan Building is the largest building in the district with a total area of approximately 3.1 million square feet (288,000 m2). Washington Union Station is designed from a combination of different architectural styles. Its Great Hall, which serves as the main hall within the building, has elaborate gold leaf designs along the ceilings and the hall includes several decorative classical-style statues. Demographics The U.S. Census Bureau estimates that the district's population was 705,749 as of July 2019, an increase of more than 100,000 people compared to the 2010 United States Census. When measured on a decade-over-decade basis, this continues a growth trend since 2000, following a half-century of population decline. But on a year-over-year basis, the July 2019 census count shows a population decline of 16,000 individuals over the preceding 12-month period. Washington was the 24th most populous place in the United States . According to data from 2010, commuters from the suburbs increase the district's daytime population to over a million. If the district were a state it would rank 49th in population, ahead of Vermont and Wyoming. The Washington metropolitan area, which includes the district and surrounding suburbs, is the sixth-largest metropolitan area in the U.S. with an estimated six million residents as of 2016. When the Washington area is included with Baltimore and its suburbs, it forms the vast Washington–Baltimore combined statistical area. With a population exceeding 9.8 million residents in 2020, it is the third-largest combined statistical area in the country. According to 2017 Census Bureau data, the population of Washington, D.C. was 47.1% Black or African American, 45.1% White (36.8% non-Hispanic White), 4.3% Asian, 0.6% American Indian or Alaska Native, and 0.1% Native Hawaiian or Other Pacific Islander. Individuals from two or more races made up 2.7% of the population. Hispanics of any race made up 11.0% of the district's population. Washington has had a significant African American population since the city's foundation. African American residents composed about 30% of the district's total population between 1800 and 1940. The black population reached a peak of 70% by 1970, but has since steadily declined due to many African Americans moving to the surrounding suburbs. Partly as a result of gentrification, there was a 31.4% increase in the non-Hispanic white population and an 11.5% decrease in the black population between 2000 and 2010.