(a) the average annual rate of increase for principal and interest payments shall not exceed:

(i) 7.5 percent per annum for a mortgage with a graduation period of five years or less;

(ii) 6.5 percent per annum for a mortgage with a graduation period of six years;

(iii) 5.5 percent per annum for a mortgage with a graduation period of seven years;

(iv) 4.5 percent per annum for a mortgage with a graduation period of eight years;

(v) 3.5 percent per annum for a mortgage with a graduation period of nine years; and

(vi) 3 percent per annum for a mortgage with a graduation period of ten years.

(b) periodic payments of principal and interest shall not change more than once per annum and increases shall be limited to the first ten years of the term of the mortgage.

(c) payments of principal and interest are required in amounts sufficient to pay all interest and full repayment of principal within a period not to exceed forty years. 3. Graduated payment mortgages may be offered only if the lender:

(a) offers the prospective borrower a non-graduated payment mortgage loan at the prevailing rate being offered by that lender;

(b) provides the mortgagor with the option to convert the graduated payment mortgage loan to a non-graduated payment mortgage loan at a pre-determined time agreed upon between the borrower and lender and at the same rate of interest provided for the graduated payment mortgage loan; and

(c) discloses in advance on a uniform disclosure statement, prescribed by the superintendent of financial services, the relevant provisions of the graduated payment mortgage loan including:

(i) a side by side comparison of interest rates and other terms that differ between a non-graduated payment mortgage loan and a graduated payment mortgage loan;

(ii) payment schedules for both types of loans and the total payment in dollars over the full term of each loan;

(iii) a statement prominently displayed that borrowers have the option to elect a non-graduated payment mortgage loan; and

(iv) a description of the conversion option. 4. Failure of any lender to comply with any of the foregoing provisions shall not render the mortgage void or unenforceable unless otherwise provided by law. 5. The provisions of this section shall be applicable only to a mortgage on real property improved by a one to six family residence given by a natural person to secure a loan or to any agreement or note made by a natural person in pursuance of any loan for the purpose of financing the purchase of or refinancing an existing ownership interest in certificates of stock or other evidence of an ownership interest in, and a proprietary lease from, a corporation or partnership formed for the purpose of the cooperative ownership of real estate, unsecured except to the extent of an assignment or transfer of the stock certificates or other evidence of ownership interest of the borrower and the proprietary lease within ninety days from the making of the loan which would otherwise conform to the provisions of this section but is not otherwise entitled to be recorded as a mortgage.