<Table> Kiewit Corporation <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Type </Th> <Td> Private </Td> </Tr> <Tr> <Th> Industry </Th> <Td> Construction, mining, welding </Td> </Tr> <Tr> <Th> Founded </Th> <Td> 1884 (Kiewit Brothers) </Td> </Tr> <Tr> <Th> Headquarters </Th> <Td> Kiewit Plaza Omaha, Nebraska, U.S. </Td> </Tr> <Tr> <Th> Key people </Th> <Td> Bruce Grewcock (President / CEO) </Td> </Tr> <Tr> <Th> Revenue </Th> <Td> $12,338.0 million USD (2012) </Td> </Tr> <Tr> <Th> Net income </Th> <Td> $581.0 million USD (2011) </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.kiewit.com </Td> </Tr> </Table> <Tr> <Th> Type </Th> <Td> Private </Td> </Tr>

Where is the corporate office of kiewit corporation located
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