At one point, the Witnesses held 4.5 million square feet over 30 buildings. They’re down to nine buildings, having made about $1.25 billion on staggered sales since 2004, according to the CO.
http://therealdeal.com/2016/09/22/the-secret-to-jehovahs-witnesses-real-estate-success-maintenance-and-patience/
Warwick is 1.6 Million Square-Foot. At $125 per foot (industry standard), you are looking at 200 Million construction fee. Sure, there is free work force, however, they still had to pay for the land. Other expense would be actually moving over there. So, it looks like it is a clear profit of about 1 Billion dollars!
What puzzles me is the fact that they could have easily paid 100 million dollars in labor and let the brothers and sisters preach instead of building something. They obviously don't hold preaching as such a high priority after all, do they. Better put 100 million aside to pay the law suites!