Why the married or civil union spouse who is not the owner of the real estate property and who is de facto separated or legally separated must intervene and sign the deed of sale?

It is possible that the married or civil union spouses have ceased to live together, but that the judgment of divorce has not been rendered yet. These spouses, de facto separated, still remain legally married or in a civil union. For this reason, the notary who will receive the sale will prefer to ask for the intervention of the non-owner spouse and obtain his renunciation to all his rights in the real estate property, thus assuring the purchaser a clear title of ownership.