(1) PROCEDURE. The city may alter the plan of improvement after its approval under s. 32.55 (2) at any time prior to the confirmation of the assessment of benefits and damages. The board shall submit to the common council the proposed alteration of the plan plus an amended estimate of the cost and the benefits and an amended map of the proposed improvement. The common council shall approve the alteration by resolution before the alteration is effective. If the city alters the plan while benefits and damages are being assessed under s. 32.57, the board shall reassess benefits and damages based on the altered plan.
(2) RECORDING THE ALTERATION. The city attorney shall record the common council’s resolution approving the alteration under sub.
(1) plus a description of the alteration in the office of the register of deeds of the county in which the property is located.