Finding:

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   Empire State Building

   As of 2007, approximately 21,000 employees work in the building each day, making the Empire State Building the second-largest single office complex in America, after the Pentagon. ... The exterior of the building was built using Indiana limestone panels.
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   Order of St. Gregory the Great

   John J. Raskob, financial executive and businessman (DuPont, General Motors); built the Empire State Building
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   John J. Raskob

   Raskob left GM after the board supported Sloan, sold his GM stock, and used the proceeds to build the Empire State Building.
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   Skyscraper design and construction

   A worker helps build the Empire State Building ... "Skyscrapers will continue to be built, author of book on tall buildings says".
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   July 20/Events1

   1930 - New York State: Alfred E. Smith, president of the company building the Empire State Building, announces the structure will have an observation deck 1,288 feet above Fifth Avenue.
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   Al Smith

   He then became president of the Empire State, Inc. and was instrumental in getting the Empire State Building built during the Great Depression.
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   List of California Historical Landmarks

   Plymouth Trading Post (#470), Plymouth—This building, constructed entirely of brick, was built in 1857. ... Location: Empire Mine State Historic Park, 10791 Empire St, 1 mi (1.6 km).2 of Grass Valley
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   List of national historic sites of Canada

   Fort Garry Hotel — Château style railway hotel built 1911-13 ... Langevin Block - Fine Second Empire building for expanding federal government, 1883-89
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   Song Dynasty

   The 42 m (137 ft) tall, brick and wood Lingxiao Pagoda of Zhengding, Hebei, built in 1045. ... The architect Li Jie (1065–1110), who published the Yingzao Fashi ('Treatise on Architectural Methods') in 1103, greatly expanded upon the works of Yu Hao and compiled the standard building codes used by the central government agencies and by craftsmen throughout the empire.
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    Sassanid Empire

    The Sassanids, similar to the Roman Empire, were in a constant state of conflict with neighboring kingdoms and nomadic hordes. ... The Persians solved the problem of constructing a circular dome on a square building by employing squinches, or arches built across each corner of the square, thereby converting it into an octagon on which it is simple to place the dome.

Explore the following pages on Powerset:

• Empire State Building,
• Order of St. Gregory the Great,
• John J. Raskob,
• Skyscraper design and construction,
• July 20/Events1,
• Al Smith,
• List of California Historical Landmarks,
• List of national historic sites of Canada,
• Song Dynasty,
• Sassanid Empire