Swapping is not so easy.

Real states affirm they are out of money. It is something unbelievable. We can imagine at least a couple of uses they gave to those huge sums of money they received...

Now the housing market is stopped, they offer you the best option, the business of your life: swapping the non-existing-house you bought, for the nearly-built-house-difficult to sell. The proposal is as clear as "taking the money from the deposit over the house you selected and paid for three, four or five years ago and putting it over other house" (any of that nice houses they are unable to sell nowadays). Who cares about legal consequences of this? who cares about the money you paid, about the interest over the money you paid, about the prices then (higher) and now (lower)?

You can think about that option, meditate on the possibility, of course but ALWAYS taking legal advice. You need to know if the offer is right and fair and the most important point: you need to know what will happen after the swapping. Legal and taxes implications are several and serious, you can not take the risk without knowing what kind of risk you are facing exactly: the last thing a buyer in problems needs is more problems.