It is actually quite
common practice in Spain to offer the owner or estate agent to remove it from
the market while you arrange the legal side of things. If you are satisfied with
the first legal checks, then you would normally be expected to pay 10% deposit
on the price of the house to secure its sale to you.
The
deposit system has advantages for the seller and the buyer. If at any stage you
decide to pull out of the deal, you lose the deposit. On the other hand, if the
owner decides to pull out of the deal, then he or she has to compensate you with
double the 10% deposit.
This tends to make it very
unusual for sellers to pull out of a sale because they have received a better
offer from other potential buyers.