(1) In addition to and in combination with the refunding bonds authorized by this article, the public body may concurrently issue special obligation refunding bonds, for the purpose of providing additional funds with which to accomplish the refunding of outstanding general obligations or outstanding revenue obligations. Such special obligation refunding bonds shall be payable solely from amounts pledged under the escrow or trust agreement derived from certain specified interest or principal, or both interest and principal, payments on the investments in said escrow or trust account.

(2) The total principal amount of special obligation refunding bonds shall not exceed the sum of the following items reduced by the total principal amount of refunding bonds, other than special obligation refunding bonds, to be issued as a part of such refunding transaction:

(a) The total outstanding principal amount of the obligations being refunded;

(b) The prior redemption premium, if any, payable on that portion of the obligations being refunded which are to be called for redemption prior to maturity, as set forth in the ordinance or resolution authorizing the refunding bonds;

(c) The total accrued and unaccrued interest payable on the obligations refunded to stated maturity dates or to the dates at which all or specified portions of the refunded obligations are to be called for redemption prior to maturity, as set forth in the ordinance or resolution authorizing the refunding bonds, less the amount of any such accrued interest deposited into the escrow account by the issuer; and

(d) All costs incurred in the authorization, sale, issuance, and delivery of the refunding bonds and the special obligation refunding bonds.

(3) The public body shall have no authority or power, at any time or in any manner, to pledge its credit, or its taxing power or any other funds, moneys, income, or revenues of such public body other than as specified in this section, to the payment of the principal of or interest on the special obligation refunding bonds issued pursuant to this section, nor shall such special obligation refunding bonds be deemed to be a debt or indebtedness of the public body or the state of Colorado, and such condition shall be set forth on the face of the bonds; except that such public body may pledge any other taxing power, funds, moneys, income, or revenues of such public body as additional security for the special obligation refunding bonds.

(4) The general provisions of this article relating to refunding obligations shall equally apply to special obligation refunding bonds, except as otherwise provided in this article.