In the discretion of the Authority, any bonds issued under the provisions of this article may be secured by a trust indenture or agreement by and between the Authority and a corporate trustee, which may be any trust company or bank having the powers of a trust company within or without the Commonwealth. The trust indenture or agreement or the resolution providing for the issuance of the bonds may (i) pledge or assign the revenues to be received and provide for the mortgage of any project or property or any part thereof and (ii) contain provisions for protecting and enforcing the rights and remedies of the bondholders as may be reasonable and proper and not in violation of law, including covenants providing for the repossession and sale by the Authority or any trustees under any trust indenture or agreement of any project, or part thereof, upon any default under the lease or sale of such project, setting forth the duties of the Authority in relation to the acquisition of property and the planning, development, acquisition, construction, rehabilitation, establishment, improvement, extension, enlargement, maintenance, repair, operation and insurance of the project in connection with which the bonds shall have been authorized; the amounts of rates, rents, fees and other charges to be charged; the collection of such rates, rents, fees and other charges; the custody, safeguarding and application of all moneys; and conditions or limitations with respect to the issuance of additional bonds. It shall be lawful for any national bank with its main office in the Commonwealth or any other state or any bank or trust company incorporated under the laws of the Commonwealth or another state that may act as depository of the proceeds of bonds or of revenues to furnish the indemnifying bonds or to pledge the securities required by the Authority. Any trust indenture or agreement or resolution may set forth the rights of action by bondholders. In addition to the foregoing, any such trust indenture or agreement or resolution may contain such other provisions as the Authority may deem reasonable and proper for the security of the bondholders including, without limitation, provisions for the assignment to a corporate trustee or escrow agent of any rights of the Authority in any project owned by, or leases or sales of any projects made by, the Authority. All expenses incurred in carrying out the provisions of the trust indenture or agreement or resolution or other agreements relating to any project, including those to which the Authority may not be a party, may be treated as a part of the cost of the operation of the project or projects.