(1) The principal of and interest on any bonds issued under the authority of this chapter (a) shall be secured by a pledge of the revenues derived from the sale or lease of the facilities out of which such bonds shall be made payable, (b) may be secured by a mortgage covering all or any part of the facilities, (c) may be secured by a pledge or assignment of the lease of such facilities, or (d) may be secured by a trust agreement or such other security device as may be deemed most advantageous by the governing body.
(2) The proceedings under which the bonds are authorized to be issued under the provisions of this chapter, and any mortgage given to secure the same may contain any agreements and provisions customarily contained in instruments securing bonds, including, without limiting the generality of the foregoing, provisions respecting (a) the fixing and collection of rents for any facilities covered by such proceedings or mortgage, (b) the terms to be incorporated in the lease of such facilities, (c) the maintenance and insurance of such facilities, (d) the creation and maintenance of special funds from the revenues of such facilities, and (e) the rights and remedies available in the event of a default to the bond owners or to the trustee under a mortgage or trust agreement, all as the governing body shall deem advisable and as shall not be in conflict with the provisions of this chapter: PROVIDED, That in making any such agreements or provisions a municipality shall not have the power to obligate itself except with respect to the facilities and the application of the revenues therefrom, and shall not have the power to incur a pecuniary liability or a charge upon its general credit or against its taxing powers.
(3) The proceedings authorizing any bonds under the provisions of this chapter and any mortgage securing such bonds may provide that, in the event of a default in the payment of the principal of or the interest on such bonds or in the performance of any agreement contained in such proceedings or mortgage, such payment and performance may be enforced by mandamus or by the appointment of a receiver in equity with power to charge and collect rents and to apply the revenues from the facilities in accordance with such proceedings or the provisions of such mortgage.
(4) Any mortgage made under the provisions of this chapter, to secure bonds issued thereunder, may also provide that, in the event of a default in the payment thereof or the violation of any agreement contained in the mortgage, the mortgage may be foreclosed and the mortgaged property sold under proceedings in equity or in any other manner now or hereafter permitted by law. Such mortgage may also provide that any trustee under such mortgage or the owner of any of the bonds secured thereby may become the purchaser at any foreclosure sale if the highest bidder therefor. No breach of any such agreement shall impose any pecuniary liability upon a municipality or any charge upon their general credit or against their taxing powers.
(5) The proceedings authorizing the issuance of bonds hereunder may provide for the appointment of a trustee or trustees for the protection of the owners of the bonds, whether or not a mortgage is entered into as security for such bonds. Any such trustee may be a bank with trust powers or a trust company and shall be located in the United States, within or without the state of Washington, shall have the immunities, powers and duties provided in said proceedings, and may, to the extent permitted by such proceedings, hold and invest funds deposited with it in direct obligations of the United States, obligations guaranteed by the United States or certificates of deposit of a bank (including the trustee) which are continuously secured by such obligations of or guaranteed by the United States. Any bank acting as such trustee may, to the extent permitted by such proceedings, buy bonds issued hereunder to the same extent as if it were not such trustee. Said proceedings may provide for one or more co-trustees, and any co-trustee may be any competent individual over the age of twenty-one years or a bank having trust powers or trust company within or without the state. The proceedings authorizing the bonds may provide that some or all of the proceeds of the sale of the bonds, the revenues of any facilities, the proceeds of the sale of any part of a facility, of any insurance policy or of any condemnation award be deposited with the trustee or a co-trustee and applied as provided in said proceedings.