A commercial bank may lend on the security of a first security interest on stock or a membership certificate issued to a tenant-stockholder or resident-member by a completed fee simple cooperative housing corporation, as defined in Section 216 of the U.S. Internal Revenue Code, and the assignment by way of security of the borrower’s interest in the proprietary lease or right of tenancy in property issued by such cooperative housing corporation, provided all of the real property owned by such corporation is located within the state, and further provided, that:

1. (a) The term of the loan does not exceed 30 years, is repayable in substantially equal installments (or such variation therefrom as may be authorized under a loan executed pursuant to Section 1916.5 or 1916.8 of the Civil Code), not less often than monthly, with payments commencing not later than 60 days from the date of the loan, and the amount does not exceed 80 percent of the sound market value of such certificates of stock or membership certificates; and

2. (b) The proprietary lease or right of tenancy in the property provides:

   1. (1) That no sublease in excess of one year, amendment or modification to such proprietary lease or right of tenancy in the property shall be permitted or created without the lender’s prior written consent, and

   2. (2) That in the event of the borrower’s default under such loan, the lender shall have the right, without the prior consent or approval of the cooperative housing corporation, to sell such shares or membership certificates at public or private sale following at least 30 days prior written notice to the borrower and to the cooperative housing corporation, at the address of the premises subject to the proprietary lease or right of tenancy in the property, and assign such proprietary lease or right of tenancy in the property to the purchaser who shall agree as a condition of such assignment to cure any defaults thereunder.

      For all purposes of this division, such loan shall be considered a secured residential real estate loan and shall be subject to rules and regulations implementing the provisions of this section issued by the commissioner.