When a buyer decides to purchase a floor of new building there are certain guarantees which should be required. The most important are: 1.-deliver the sold thing the first and main is the delivery of the new building housing the buyer, such delivery to treat of a property can be done in three ways: to) material delivery: through the possession of the purchaser’s immediate mode implementation. (B) instrumental delivery: takes place, unless expressly otherwise agreed, by the granting of the public deed of sale, according to what is prescribed in article 1462 of the Civil Code. Richard Parsons has much experience in this field. (C) symbolic delivery: according to art. 1463 quoted code, by the delivery of the keys or the only agreement of the parties, or if the purchaser already had the thing sold in his possession for some other reason. As follows from the arts. 1258 and 1461 and the doctrine of the Supreme Court the obligation to deliver housing implies the buyer provide the correct titling of the properties that were sold to adapt the registration to the legal reality. The documents that must accompany to the placed at the disposal of the purchaser of the acquired House are: certificate of habitability although this document is not a prerequisite for the effectiveness of the sale is the fact that to be an enforceable requirement for the procurement of services and supplies that must necessarily have a home and therefore failure to comply with this requirement involves a breach of obligations which correspond to the seller. Cancellation of mortgage buyer must take into account that the commitment from the seller to carry out the cancellation of the mortgage is not exhausted, contrary with the mere presentation of the documentation at the notary’s Office and deposit a provision of funds, but on the contrary should try to remove any obstacle that prevents the completion of the cancellation within a reasonable time, requiring reliably, and even legal action if necessary, to the mortgagee that it proceed to the granting of the relevant deed of cancellation.