CREATE TABLE table_66687 ("Rank" TEXT, "Name" TEXT, "Height ft  ( m ) " TEXT, "Floors" FLOAT, "Year" FLOAT, "Address" TEXT)

What is the total time for one south broad?
SELECT SUM("Year") FROM table_66687 WHERE "Name" = 'one south broad'
SELECT SUM("Year") FROM "table_66687" WHERE "Name" = 'one south broad'