here's an example : a pub fails, and the brewers cannot see a profitable future for it. It is put up for sale as a pub, since planning permission for anything else cannot be obtained. The locals get together and bid to buy it and run it themselves as a community asset. The brewers suspect that this, too, will fail, and the community will have to sell it for redevelopment in a few years time, having shown that it has no future as a community asset. The value for redevelopment will be ( say) double the value as a useless pub, so the brewers want to hang on to get some of the value they would have got if they themselves could have got planning permission. Must be a common problem.