N.D. Cent. Code § 35-03-17
A mortgage which contains the following statement in printed or typed capital letters: "THE PARTIES AGREE THAT THIS MORTGAGE CONSTITUTES A COLLATERAL REAL ESTATE MORTGAGE PURSUANT TO NORTH DAKOTA CENTURY CODE CHAPTER 35-03" is subject to the provisions of this section. A mortgage executed pursuant to this section must be entitled in printed or typed capital letters: "MORTGAGE - COLLATERAL REAL ESTATE MORTGAGE". A mortgage made pursuant to this section, notwithstanding the fact that from time to time during the term thereof no indebtedness is due from the mortgagor to the mortgagee, constitutes a continuing lien against the real property covered thereby for the amount stated in the mortgage. Any sums not exceeding the face amount of the mortgage, together with interest thereon as provided in the instrument secured by the mortgage, advanced by the mortgagee during the term of the mortgage have a lien priority as of the date the mortgage was filed. At any time the indebtedness due the mortgagee is zero, the mortgagor may demand in writing that the mortgage be satisfied, and the mortgagee shall within ten days thereafter execute and record a satisfaction thereof. Collateral real estate mortgages may be used to secure commercial, agricultural, or consumer loans or lines of credit including, but not limited to, revolving notes and credits and overdraft checking plans.
A filed collateral real estate mortgage which states a maturity date of the instrument secured thereby of five years or less is effective until such maturity date and thereafter for a period of sixty days. Any other filed collateral real estate mortgage is effective for a period of five years from the date of filing and thereafter for a period of sixty days. A filed collateral real estate mortgage which states that the instrument secured thereby is payable on demand is effective for five years from the date of filing and thereafter for a period of sixty days. The effectiveness of a filed collateral real estate mortgage lapses upon the expiration of the sixty-day period unless an addendum to the collateral real estate mortgage extending its effective date is filed prior to the lapse. If a filed collateral real estate mortgage exists at the time insolvency proceedings are commenced by or against the debtor, the mortgage remains effective until sixty days after termination of the insolvency proceeding or until expiration of the five-year period, whichever occurs later. Upon such lapse, the lien created by the collateral real estate mortgage terminates. An addendum continuing the effectiveness of the lien of the collateral real estate mortgage may be filed by the mortgagee:
An addendum to a collateral real estate mortgage for the sole purpose of continuing the effectiveness of its lien need be signed only by the mortgagee. Upon the timely filing of such an addendum to a collateral real estate mortgage, the effectiveness of the collateral real estate mortgage will be continued for five years after the stated maturity date in those instances in which the original collateral real estate mortgage provided a maturity date or for five years after the expiration of the five-year period whereupon it lapses in the same manner as provided above unless another addendum to the collateral real estate mortgage continuing the effectiveness of its lien is filed prior to such lapse. Succeeding addendums to collateral real estate mortgages may be filed in the same manner to continue the effectiveness of the lien of the collateral real estate mortgage.
N.D.C.C. § 35-03-17