580b. No deficiency judgment shall lie in any event after a sale of
real property or an estate for years therein for failure of the
purchaser to complete his or her contract of sale, or under a deed of
trust or mortgage given to the vendor to secure payment of the
balance of the purchase price of that real property or estate for
years therein, or under a deed of trust or mortgage on a dwelling for
not more than four families given to a lender to secure repayment of
a loan which was in fact used to pay all or part of the purchase
price of that dwelling occupied, entirely or in part, by the
purchaser.
Where both a chattel mortgage and a deed of trust or mortgage have
been given to secure payment of the balance of the combined purchase
price of both real and personal property, no deficiency judgment
shall lie at any time under any one thereof if no deficiency judgment
would lie under the deed of trust or mortgage on the real property
or estate for years therein.