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groundscraper is a large building that is only around a dozen stories high but which greatly extends horizontally.
MSN Encarta defines groundscraper as "a large low or medium-rise building, typically containing offices, that spreads horizontally and occupies a large amount of land".
Prora on Rugia Island in Germany is one of the largest building complexes ever constructed. The
Berlin Tempelhof Airport was the world's largest building when constructed in the 1930s.
Merchandise Mart in Chicago, Illinois, a massive multi-story shopping and commercial center. Swiss bank
UBS is planning the largest office building in the City of London; the design of 5 Broadgate has been labelled a groundscraper.  The
Indonesia Convention Exhibition in Greater Jakarta, Indonesia is a massive convention center built to host various public events and performances for the city.
China Vanke headquarters in Shenzhen is as large as the Empire State Building, but is laid out horizontally and 5 stories above ground level.  A park occupies the space below.   
The Squaire in Frankfurt am Main is Germany's largest office building and is 660 metres long, over twice the height of Germany's tallest building, the Commerzbank Tower.
The Pentagon in Arlington County, Virginia is one of the largest office buildings in the United States, and is as long across as the Empire State Building is tall, but only rises five stories above ground level.
Apple Park in Cupertino, California is one of the largest office buildings in the United States, notable for its unique circular form and size rivaling that of The Pentagon. The Jean-Luc Lagardère Plant in Toulouse, France is the massive assembly hall of the Airbus A380, the world's largest airliner.