CREATE TABLE table_47886 ("Name" CLOB, "Height  ( m ) " FLOAT, "Height  ( ft ) " FLOAT, "Location" CLOB, "Year built" FLOAT)

What is the sum of the heights in meters for the commerzbank tower built after 1984?
SELECT SUM("Height (m)") FROM table_47886 WHERE "Year built" > '1984' AND "Name" = 'commerzbank tower'
SELECT SUM("Height (m)") FROM "table_47886" WHERE "Name" = 'commerzbank tower' AND "Year built" > '1984'