That's exactly the point. On big vertical building covers 1 acre of land but it has 80 acres of interior space. There's one honking water pipe in the basement that will never need to be replaced, instead of mile after mile of water pipes with leaky fittings every 50 feet.
$3.9 billion pays for a lot of leaky pipes - and the pipe has to source water from somewhere - https://en.wikipedia.org/wiki/New_York_City_water_supply_sys...