'GUEST, Not a property developer' there seem to be five huge assumptions underlying your contribution:

(i) The only thing at issue is the crude economics of house building.

(ii) We have an infinite amount of land available which we can go on filling up with houses and infrastructure forever.

(iii) Because agriculture (food production) is not very viable at the moment it won't be again in the future. And there will never be a time when we won't be able to rely on imported food and will need to feed our ever-growing population on 'home-grown' food.

(iv) The surface of this island is exclusively for human use only and any other living things are irrelevant.

(v) Overpopulation is solely the fault of immigrants and has nothing to do with the indigenous assumption that exponentially expanding human populations are not a problem.

Until we start challenging such absurd assumptions, and start looking at ways of slowing down population growth and reducing the 'human footprint' (as opposed to madly increasing it) will we have any a chance of the survival of the human race beyond the next couple of centuries.