My thought is that it's a TOWERing structure, it TOWERs over the city, etc. Rather than being a tower per se.
Edit: On both this and the Spanish/Portuguese question, I think T-hawk is a big believer in giving clues that have the right connotations and convey the right idea, even if they aren't 100% factually accurate.
Edit: On both this and the Spanish/Portuguese question, I think T-hawk is a big believer in giving clues that have the right connotations and convey the right idea, even if they aren't 100% factually accurate.