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How big is 77,000 square meters?

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It's about as big as Buckingham Palace.
(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 77,000 sq. m of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.
It's about nine-tenths as big as Alcatraz.
In other words, 77,000 square meters is 0.870 times the size of Alcatraz, and the size of Alcatraz is 1.10 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 89,000 square meters. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
It's about seven-tenths as big as Ellis Island.
In other words, 77,000 square meters is 0.6940 times the size of Ellis Island, and the size of Ellis Island is 1.440 times that amount.
(Jersey City, New Jersey and New York City, New York)(now officially part of the Statue of Liberty National Monument)
Ellis Island, home of the Ellis Island Immigration Station, is 111,000 square meters in total area. Nine-tenths of the island were artificially created after the New York-New Jersey borders had already been defined, leading to a sovereignty dispute which was settled by the US Supreme Court in 1998.
It's about one-and-a-half times as big as Windsor Castle.
In other words, the size of Windsor Castle is 0.670 times 77,000 square meters.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 53,000 sq. m. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about one-and-a-half times as big as a Polo field.
In other words, 77,000 square meters is 1.534853890 times the size of a Polo field, and the size of a Polo field is 0.6515278140 times that amount.
(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 50,167.6416 sq. m. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.
It's about three-fifths as big as The Pentagon.
In other words, 77,000 square meters is 0.5580 times the size of The Pentagon, and the size of The Pentagon is 1.790 times that amount.
(a.k.a. United States Department of Defense Headquarters) (Washington, D.C.) (total floor area)
The Pentagon, the world's largest office building, contains a total floor area of 138,000 sq. m. Built during World War II, the designers compensated for the steel rations then in effect by using 310,000 cu. m of concrete in the construction efforts.
It's about two-and-a-half times as big as The Lincoln Memorial Reflecting Pool.
In other words, 77,000 square meters is 2.440 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 0.410 times that amount.
(Washington, D.C.) (pool surface area)
The Lincoln Memorial Reflecting Pool has a water surface area of 31,500 sq. m. The Pool has a sloping bottom and extends to 80 cm (30 in) in depth at its center.