<Table> <Tr> <Th_colspan="2"> Empire State Building </Th> </Tr> <Tr> <Td_colspan="2"> Seen from 30 Rockefeller Plaza, 2010 </Td> </Tr> <Tr> <Th_colspan="2"> Record height </Th> </Tr> <Tr> <Td_colspan="2"> Tallest in the world from 1931 to 1970 </Td> </Tr> <Tr> <Th> Preceded by </Th> <Td> Chrysler Building </Td> </Tr> <Tr> <Th> Surpassed by </Th> <Td> 1 World Trade Center (Twin Towers) </Td> </Tr> <Tr> <Th_colspan="2"> General information </Th> </Tr> <Tr> <Th> Status </Th> <Td> Complete </Td> </Tr> <Tr> <Th> Type </Th> <Td> Office building; observation deck </Td> </Tr> <Tr> <Th> Architectural style </Th> <Td> Art Deco </Td> </Tr> <Tr> <Th> Location </Th> <Td> 350 Fifth Avenue Manhattan, New York 10118 </Td> </Tr> <Tr> <Th> Construction started </Th> <Td> March 17, 1930; 87 years ago (1930 - 03 - 17) </Td> </Tr> <Tr> <Th> Completed </Th> <Td> April 11, 1931; 86 years ago (April 11, 1931) </Td> </Tr> <Tr> <Th> Opening </Th> <Td> May 1, 1931; 86 years ago </Td> </Tr> <Tr> <Th> Cost </Th> <Td> $40,948,900 ($645 million in 2016 dollars) </Td> </Tr> <Tr> <Th> Owner </Th> <Td> Empire State Realty Trust </Td> </Tr> <Tr> <Th_colspan="2"> Height </Th> </Tr> <Tr> <Th> Architectural </Th> <Td> 1,250 ft (381.0 m) </Td> </Tr> <Tr> <Th> Tip </Th> <Td> 1,454 ft (443.2 m) </Td> </Tr> <Tr> <Th> Roof </Th> <Td> 1,250 ft (381.0 m) </Td> </Tr> <Tr> <Th> Top floor </Th> <Td> 1,224 ft (373.1 m) </Td> </Tr> <Tr> <Th> Observatory </Th> <Td> 1,224 ft (373.1 m) </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Th> Other dimensions </Th> <Td> length (east - west) 424 ft (129.2 m) width (north - south) 187 ft (57.0 m) </Td> </Tr> <Tr> <Th_colspan="2"> Technical details </Th> </Tr> <Tr> <Th> Floor count </Th> <Td> 102 </Td> </Tr> <Tr> <Th> Floor area </Th> <Td> 2,248,355 sq ft (208,879 m) </Td> </Tr> <Tr> <Th> Lifts / elevators </Th> <Td> 73 </Td> </Tr> <Tr> <Th_colspan="2"> Design and construction </Th> </Tr> <Tr> <Th> Architect </Th> <Td> Shreve, Lamb and Harmon </Td> </Tr> <Tr> <Th> Developer </Th> <Td> John J. Raskob </Td> </Tr> <Tr> <Th> Structural engineer </Th> <Td> Homer Gage Balcom </Td> </Tr> <Tr> <Th> Main contractor </Th> <Td> Starrett Brothers and Eken </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Td_colspan="2"> </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> <Tr> <Td_colspan="2"> NYC Landmark </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Show map of Manhattan Show map of New York Show map of the US Show all Location in New York City </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 40 ° 44 ′ 54.36" N 73 ° 59 ′ 08.36" W ﻿ / ﻿ 40.7484333 ° N 73.9856556 ° W ﻿ / 40.7484333; - 73.9856556 Coordinates: 40 ° 44 ′ 54.36" N 73 ° 59 ′ 08.36" W ﻿ / ﻿ 40.7484333 ° N 73.9856556 ° W ﻿ / 40.7484333; - 73.9856556 </Td> </Tr> <Tr> <Th> NRHP reference #</Th> <Td> 82001192 </Td> </Tr> <Tr> <Th_colspan="2"> Significant dates </Th> </Tr> <Tr> <Th> Added to NRHP </Th> <Td> November 17, 1982 </Td> </Tr> <Tr> <Th> Designated NHL </Th> <Td> June 24, 1986 </Td> </Tr> <Tr> <Th> Designated NYCL </Th> <Td> May 19, 1981 </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Th_colspan="2"> References </Th> </Tr> <Tr> <Td_colspan="2"> I. ^ Empire State Building at Emporis </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Empire State Building </Th> </Tr>

When was the empire state building started and finished