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_16 (year VARCHAR, town VARCHAR)
### Question:
What year was the structure in greensboro, north carolina considered tallest?
### Answer:
SELECT year FROM table_name_16 WHERE town = "greensboro, north carolina"