<Tr> <Th> Floor area </Th> <Td> 4,000,000 square feet (372,000 m) </Td> </Tr> <Tr> <Th_colspan="2"> Design and construction </Th> </Tr> <Tr> <Th> Architect </Th> <Td> Graham, Anderson, Probst and White </Td> </Tr> <Tr> <Th> Main contractor </Th> <Td> John W. Griffiths & Sons </Td> </Tr>

222 merchandise mart plaza chicago illinois united states of america