Yes George, typical JW Org M.O. Use you for no cost as long as they can, as soon as that changes, throw you on the mercy of charity from other JW's. At no cost to the Org.
They did this for many a long year with D.O's ,C.O's and all the other " Full Time" folks, so no change there.
Many years ago, maybe even two decades, when London properties were going up and up in value, I suggested a move similar to the Chelmsford one to a group of Elders, they just nodded and didn't really see the point of what I was saying. Which was, sell on a rising market. They have left it so long that here in the U.K when Brexit really begins to bite from Jan. 1st property prices, especially Commercial property, but even Development too, will fall dramatically, they will sell for far less than even when I proposed it !