P.R. Laws Ap. tit. 32A, § III, Rule 69.1
In all cases in which a personal security is required, such security shall be accompanied by an affidavit by a surety stating that he is a resident of Puerto Rico and that he is the owner of the real property given as security, and that he owns property, exclusive of property exempt from execution, worth double the amount specified in the bond over and above all his debts and liabilities. If there are two (2) or more sureties and their respective liability is not sufficient to answer for the total amount of the bond, they shall also state that the whole amount of their total liability is equivalent to that of a sufficient surety. The affidavit shall also set forth the place of abode of the surety, and shall contain a description sufficient to identify the property owned by him and which he can give as security, an estimate of the actual value of such properties, encumbrances thereon, including their amount, whether or not such encumbrances are recorded in the Registry of Property, any other bond obligation contracted by the surety and which may be standing, and any other impediment in the free use and enjoyment of the property known by the affiant.
A personal or mortgage bond furnished by the surety is sufficient to authorize the court to order the Registry of Property to record it as an encumbrance in the manner provided by Rule 56.7