The method of comparison determines the MV by comparing the data of properties similar to that which is being valuated to the property in question, standardising the existing differences and making adjustments when applicable for the mortgage market. The methods for updating determine the UV from the current value obtained by capitalising, according to market rates, the net profit attributable to the property, or in the case of rented properties, the net rent existing on the valuation date. The residual methods determine the RV from the current value that may be paid for a piece of property, considering that such investment will provide, under average market conditions, profitability adjusted to the risk involved.