[['11 Diagonal Street', 'COMPLETION_DATE', '1983'], ['11 Diagonal Street', 'FLOOR_COUNT', '20'], ['11 Diagonal Street', 'ARCHITECT', 'Helmut Jahn'], ['11 Diagonal Street', 'BUILDING_START_DATE', '"1978"']]
The building at _____ was completed in 1983 , 5 years after the street itself was build in 1978. It is a 20 floor structure designed by _____.