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How big is 325 square feet?

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It's about one-three-thousandth as big as Alcatraz.
In other words, 325 square feet is 0.00034 times the size of Alcatraz, and the size of Alcatraz is 2,900 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 960,000 square feet. 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 one-three-thousand-five-hundredth as big as Ellis Island.
In other words, 325 square feet is 0.000272 times the size of Ellis Island, and the size of Ellis Island is 3,680 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 1,190,000 square feet 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-four-thousand-five-hundredth as big as The Pentagon.
In other words, 325 square feet is 0.000219 times the size of The Pentagon, and the size of The Pentagon is 4,570 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 1,490,000 square feet. 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 one-five-thousandth as big as Grand Central Station.
In other words, the size of Grand Central Station is 5,000 times 325 square feet.
(formally Grand Central Terminal, a.k.a. Grand Central, a.k.a. GCT) (New York City, New York) (total terminal area). Grand Central station, the largest train station in the world by platform count, measures 2,000,000 square feet in total area. The large flag which was suspended from the concourse ceiling following the September 11th 2001 terrorist attacks measures about 800 square feet.
It's about 5,500 times as big as a Playing Card.
In other words, the size of a Playing Card is 0.00019 times 325 square feet.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 0.06 square feet. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 0.028 square feet smaller.
It's about 5,500 times as big as a Post-it® Note (3M).
In other words, the size of a Post-it® Note (3M) is 0.00018 times 325 square feet.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.058 square feet in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Post-it® note attached to his front door.
It's about one-seven-thousand-five-hundredth as big as Washington National Cathedral.
In other words, the size of Washington National Cathedral is 7,700 times 325 square feet.
(a.k.a. Cathedral Church of Saint Peter and Saint Paul) (Washington, DC) (total plot)
Sitting atop the 115 m (377 ft) tall Mount Saint Alban at the corner of Massachusetts and Wisconsin Avenues, Washington National Cathedral sits on a landscaped, 2,500,000 square feet plot.