Any necessity of taking property for the city by condemnation shall be determined by the council and declared by a resolution of the council describing the property and stating the uses to which it is to be devoted.
The time, method and manner of making all street, sidewalk, sewer and other public improvements, the method of financing the same, the procedure for vacating, altering or abandoning streets and other public improvements, shall be governed by ordinance, or, in the absence of ordinance, by the general laws of Oregon.
The procedure for levying, collecting and enforcing special assessments for public improvements or other services to be charged against real property shall be governed by ordinance.
A contract in excess of $500 for a public improvement to be made by a private contractor shall be let to the lowest responsible bidder for the contract and shall be done in accordance with plans and specifications approved by the council.