Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_70 (height__m_ INTEGER, year_built VARCHAR, name VARCHAR)
### Question:
What is the sum of the heights in meters for the commerzbank tower built after 1984?
### Answer:
SELECT SUM(height__m_) FROM table_name_70 WHERE year_built > 1984 AND name = "commerzbank tower"