<Table> <Tr> <Th_colspan="2"> John Hancock Center </Th> </Tr> <Tr> <Td_colspan="2"> John Hancock Center </Td> </Tr> <Tr> <Td_colspan="2"> Show map of Chicago Show map of Illinois Show map of the US Show all Location within Chicago </Td> </Tr> <Tr> <Th_colspan="2"> General information </Th> </Tr> <Tr> <Th> Status </Th> <Td> Complete </Td> </Tr> <Tr> <Th> Architectural style </Th> <Td> Structural Expressionism </Td> </Tr> <Tr> <Th> Location </Th> <Td> Chicago, Illinois, U.S. </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 41 ° 53 ′ 56" N 87 ° 37 ′ 23" W ﻿ / ﻿ 41.8988 ° N 87.6230 ° W ﻿ / 41.8988; - 87.6230 Coordinates: 41 ° 53 ′ 56" N 87 ° 37 ′ 23" W ﻿ / ﻿ 41.8988 ° N 87.6230 ° W ﻿ / 41.8988; - 87.6230 </Td> </Tr> <Tr> <Th> Construction started </Th> <Td> 1965 </Td> </Tr> <Tr> <Th> Completed </Th> <Td> 1969 </Td> </Tr> <Tr> <Th> Cost </Th> <Td> $100,000,000 </Td> </Tr> <Tr> <Th> Owner </Th> <Td> The Hearn Company </Td> </Tr> <Tr> <Th_colspan="2"> Height </Th> </Tr> <Tr> <Th> Architectural </Th> <Td> 1,128 ft (343.7 m) </Td> </Tr> <Tr> <Th> Tip </Th> <Td> 1,500 ft (457 m) </Td> </Tr> <Tr> <Th> Roof </Th> <Td> 1,127 ft (344 m) </Td> </Tr> <Tr> <Th> Top floor </Th> <Td> 1,054 ft (321 m) </Td> </Tr> <Tr> <Th> Observatory </Th> <Td> 1,030 ft (314 m) </Td> </Tr> <Tr> <Th_colspan="2"> Technical details </Th> </Tr> <Tr> <Th> Floor count </Th> <Td> 100 </Td> </Tr> <Tr> <Th> Floor area </Th> <Td> 2,799,973 sq ft (260,126 m) </Td> </Tr> <Tr> <Th> Lifts / elevators </Th> <Td> 50, made by Otis Elevator Company </Td> </Tr> <Tr> <Th_colspan="2"> Design and construction </Th> </Tr> <Tr> <Th> Architect </Th> <Td> Fazlur Rahman Khan Skidmore, Owings and Merrill </Td> </Tr> <Tr> <Th> Developer </Th> <Td> John Hancock Insurance </Td> </Tr> <Tr> <Th> Main contractor </Th> <Td> Tishman Construction Co . </Td> </Tr> <Tr> <Th_colspan="2"> Website </Th> </Tr> <Tr> <Td_colspan="2"> www.360chicago.com </Td> </Tr> <Tr> <Th_colspan="2"> References </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> John Hancock Center </Th> </Tr>

When was the john hancock building in chicago built