Question: How big is the building one of the largest in the world is in?

Context paragraphs:
Aylor, Virginia: Aylor is an unincorporated community located in Madison County, Virginia, United States.  Aylor, VA was named after its founder, Kyle Aylor, who settled the area in 1869 after serving as a Confederate soldier during the American Civil War.  Aylor then, was known for building one of the largest Horse Breeding Grounds in Virginia.  After his disappearance in 1875, the State of Virginia decided to name the small community after the Breeder for great development of Madison County.  However, there have been urban legends that Aylor was a slave breeder and continued to do so even after the Emancipation Proclamation.  There are also far more frightening legends of his disappearance that reference the Mysterious Mary , the said bride of Aylor, and immobile horses.  Despite these silly legends about Aylor, the town remained under his name.

Blaiken wind farm: Between 2011 and 2015, BlaikenVind AB, a joint venture of Skellefteå Kraft and Fortum are building one of Europe's largest wind farms in northern Sweden.  When finished, the park will consist of 90 wind power plants and have a total capacity of 225 MW.  Blaiken wind farm, has been chosen as a demonstration plant by the EU's NER300 programme, one of the world's largest funding programmes for climate-neutral energy.  The project meets the challenge of developing good solutions for efficient wind power production in a cold and icy climate.

Metro Fuel Oil: United Metro Energy Corp. is a family-owned energy company that supplies and delivers bioheat, biodiesel, heating oil, ultra-low sulfur diesel fuel, natural gas and gasoline from its terminals in Greenpoint, Brooklyn, New York and Calverton, Long Island, New York.  United Metro Energy is currently building one of the largest biodiesel plants in North America, with a capacity up to 110 million gallons per year, directly adjacent to United Metro Energy’s existing Brooklyn terminal.  The biodiesel processing facility will be able to accept multiple feedstocks, including waste restaurant grease, animal fats, and soy and canola oil.  United Metro Energy plans to process 100% renewable biodiesel which can be blended with heating oil or diesel fuel.  The plant will employ technology that will enable United Metro Energy to capture and utilize waste generated by the process.  The plant is scheduled to open in Third Quarter 2012.

List of tenants in One World Trade Center: The original One World Trade Center (also known as the North Tower, Tower 1, Building One, or 1 WTC) was one of the Twin Towers of the original World Trade Center in New York City.  It was completed in 1972, standing at a height of 417 m , and was the tallest building in the world until being surpassed by the Sears Tower in Chicago in 1973.  It was distinguishable from its twin, the original Two World Trade Center, also known as the South Tower, by the 110.3 m telecommunications antenna on its roof.  Including the antenna, the building stood at a total height of 527.3 m .  The building's address was One World Trade Center, with the WTC complex having its own ZIP code of 10048 due to its large size.

New York State Museum: The New York State Museum is a research-backed institution in Albany, New York, United States.  It is located on Madison Avenue, attached to the south side of the Empire State Plaza, facing onto the plaza and towards the New York State Capitol.  The museum houses art, artifacts (prehistoric and historic), and ecofacts that reflect New York’s cultural, natural, and geological development.  Operated by the New York State Education Department's Office of Cultural Education, it is the nation's oldest and largest state museum.  Formerly located in the State Education Building, the museum now occupies the first four floors of the Cultural Education Center, a ten-story, 1500000 sqft building that also houses the New York State Archives and New York State Library.

Cathy Simon: Cathy Simon is an American architect.  She is known for her adaptive reuse and urban design projects, many of which are in the Bay area.  She is currently a Design Principal at Perkins and Will.  She was one of five founding partners of the influential female-owned firm SMWM (Simon Martin-Vegue Winkelstein Moris), based in San Francisco.  She and Martin-Vengue have spent more than 18 years "building one of the nations largest women-owned firms."  She has worked on major projects including the conversion of the San Francisco Ferry building, the San Francisco Main Library, the renovation of PG&E’s San Francisco headquarters, and the San Francisco Conservatory of Music.

New York State Library: The New York State Library was established in 1818 to serve the government of the state.  The library is one of the largest in the world by number of items held, with over 20 million.

Windows on the World: Windows on the World was a complex of venues on the top floors (106th and 107th) of the North Tower (Building One) of the original World Trade Center complex in Lower Manhattan that included a restaurant called Windows on the World, a smaller restaurant called Wild Blue, a bar called The Greatest Bar on Earth, and rooms for private functions.  Developed by restaurateur Joe Baum and designed initially by Warren Platner, Windows on the World occupied 50,000 square feet (4,600 m²) of space in the North Tower.  The restaurants operated from April 19, 1976, until 2001 when they were destroyed in the September 11 attacks.

Sam Boyd: Samuel A. "Sam" Boyd (April 23, 1910 – January 15, 1993) was an American businessman and casino manager and developer.  Boyd is noted for introducing successful marketing, gaming, and entertainment innovations into the casino gaming industry, as well as building one of the largest and most successful casino empires in the world.

Eugene C. Eppley: Eugene C. Eppley (April 8, 1884 – October 14, 1958) also known as Gene, was a hotel magnate in Omaha, Nebraska.  Eppley is credited with single-handedly building one of the most successful hotel empires, by the 1950s the largest privately owned hotel chain in the United States.

Supporting paragraphs: New York State Museum New York State Library
Answer: 1500000 sqft