Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the sum of the heights in meters for the commerzbank tower built after 1984?

### Inputs:
table_name: table, columns: ['Name', 'Height (m)', 'Height (ft)', 'Location', 'Year built']

### Response:
SELECT SUM Height (m) FROM table WHERE Year built > 1984 AND Name = commerzbank tower