By the end of 2018, half of the 28-acre Hudson Yards megaproject will have sprouted on Manhattan’s west side, though right now, the site largely still looks like the active rail yard that it is, save for the beginnings of the complex’s first tower. But the 30 active train tracks are slowly being covered by a massive platform that will hold three towers, a retail complex, a six-acre public square, and a new cultural space—and that’s just phase 1. Developer Related Companies …