user: Question: What is the sum of the heights in meters for the Commerzbank Tower built after 1984?
Columns: ['Name', 'Height (m)', 'Height (ft)', 'Location', 'Year built']
Types: ['text', 'real', 'real', 'text', 'real']
Sample row: ['Europaturm', 337.5, 1107.3, 'Ginnheimer Stadtweg 90, Bockenheim', 1979.0]
SQL:

assistant: SELECT SUM("Height (m)") FROM "Table" WHERE "Year built" > 1984.0 AND "Name" = 'Commerzbank Tower';