"In the event of credit nonreturn it becomes to be impossible without prejudice to banks to sell an object of security. That stands the question of validness of aplicable bases of valuation, in particular of delimitation in using definitions """"market value"""", """"mortgage lending value"""", """"realization value"""", and """"liquidation value"""". We consider justified for aims of the mortgage lending an use of only market value, as well as liquidation value of real estate as measure of market value under forced sale in restricted time. Use of definitions """"mortgage lending value"""" and """"realization value"""" is represented excessive."