The developer of the massive Hudson Yards project in New York City has agreed to acquire a ground lease at the intersection of Third Street and Congress Avenue in downtown Austin, potentially leading to a skyscraper development, according to sources close to the matter. While the deal is not finalized and could still fall apart, it would represent a huge opportunity — the land is zoned for up to 1.3 million square feet of development, which is more than twice as big as the Frost Bank Tower in Austin.