Cal. Gov. Code § 54702.7
In the discretion of the local agency, any bonds issued under the provisions of this chapter may be secured by a trust agreement by and between the local agency and a corporate trustee or trustees, which may be any trust company or bank having the powers of a trust company within or without this state. Such a trust agreement or the resolution providing for the issuance of bonds may pledge or assign the revenues to be received and may convey or mortgage any housing the construction of which is to be financed from the proceeds of such bonds. Such trustee agreement or resolution providing for the issuance of bonds may contain such 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 such provisions as may be included in any resolution or resolutions of the local agency authorizing the issuance of the bonds. Any such trust agreement may set forth the rights and remedies of the bondholders and of the trustee or trustees, and may restrict the individual right of action by bondholders. In addition to the foregoing, any such trustee agreement or resolution may contain such other provisions as the local agency may deem reasonable and proper for the security of the bondholders. All expenses incurred in carrying out the provisions of such trustee agreement or resolution may be treated as a part of the cost of issuance of the bonds.
Ca. Gov. Code § 54702.7