<Tr> <Th> Main contractor </Th> <Td> Starrett Brothers and Eken </Td> </Tr> <Tr> <Td_colspan="2"> Empire State Building </Td> </Tr> <Tr> <Td_colspan="2"> U.S. National Register of Historic Places </Td> </Tr> <Tr> <Td_colspan="2"> U.S. National Historic Landmark </Td> </Tr>

Who has offices in the empire state building