Table: philadelphia_buildings
Columns: rank
name
height_ft_m
floors
year
address

Question: What is the total time for one south broad?
SQL: SELECT SUM("year") FROM philadelphia_buildings WHERE "name" = 'one south broad'

Question: What is the 123 south broad street address name before 1973?
SQL: SELECT "name" FROM philadelphia_buildings WHERE "year" < 1973 AND "address" = '123 south broad street'