I wondered how common this was in Turkey since I have some friends who did just this and said they thought it was commonplace. This is how it works. You buy a plot of land big enough for two houses. A builder builds these two for you and then - this is the clever bit - gives you yours for nothing! In return he gets the other house and, when he sells it, that's his profit on the job. Has anybody/everybody come across this, or is it local to a particular area?