Answer: assessment lien
Explanation:
From the question, we are informed that the City of Grand Rapids installed a new water main on Oak Street and that the city then decided to charge the property owners along Oak Street a proportional cost of the new water main.
We are further told that a property owner refuses to pay their proportional share of the cost. In this case, the city may file an assessment lien as this allows the city to sell the property of the homeowner so as to repay the assessments that the person owe.
