The city shall have the power to make public improvements, including local improvements, within the city and to the extent authorized by law, ordinance or this charter, outside the city.
The cost of a public improvement may be paid wholly by the city, or partly by the city and partly by benefited property, or wholly by benefited property, as the council may determine. Said cost or part thereof to be borne by benefited property may be assessed by special assessment upon the benefited property.