As I've said, I have a real estate background. Making money in flipping properties requires doing something to the property that makes it more valuable. This style of building doesn't have anything that can be upgraded. The only value that will change is the land under it.
In commercial buildings, landlords have a fair amount of say in the allowed uses in the building. Exceptions to discrimination laws are available (at least in the US) for properties owned by religious organizations. I used to manage a medical office tower owned by an order of Catholic nuns. Their leases had specific language about what uses they allowed in the building.
I don't think that part would be a problem for the WTBS in this. And they have a proven track record in passing off BS to the membership no matter how it smells. I'm sure they could convince most of the R&F that this was Jehovah's provision for paying for the world wide work.