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_23759976_1 (rank VARCHAR, building_ VARCHAR, a_ VARCHAR)
### Question:
How many different ranks does the Cathay Pacific Plaza 2 have?
### Answer:
SELECT COUNT(rank) FROM table_23759976_1 WHERE building_[a_] = "Cathay Pacific Plaza 2"