The resolution of intention:
(a) Shall briefly describe the proposed improvement.
(b) Shall describe, in writing or by reference to the diagram referred to in Section 18041 with any modifications required by the city council, the boundaries of the assessment district.
(c) May order that a certain portion or percentage of the costs and expenses of the improvement, the amount of which portion or percentage shall be specified in the resolution, shall be paid out of the city treasury from any fund the city council may designate.