Question: The KVLY-TV mast is the fourth tallest structure in the world behind the megatall skyscraper that is how many stories in height?
Sentence (from "Shanghai Tower"): It is the world's second-tallest building by height to architectural top (behind Dubai's Burj Khalifa, 828 m) and the world's third-tallest structure (behind Tokyo Skytree, 634 m).
Relevant evidence: No