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Penthouse
apartment on the highest floor of an apartment building / From Wikipedia, the free encyclopedia
A Penthouse is typically an apartment on the highest floor of an apartment building. It usually takes up less than half of the entire (flat) roof of the building.[1] Originally the word penthouse meant a small building with a sloped roof.[2] The modern use of the word started in the 1920s in America. In the age of skyscrapers the "house" on the roof was called a penthouse.[2] A penthouse can also be commercial space.
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Penthouse with a pool in New York City