The city may acquire, by purchase, gift, devise, or condemnation, any property, corporeal or incorporeal, either within or without its corporate boundaries, which may be needed by the city for any public use or purpose. Easements for slopes, fills, sewers, building lines, poles, wires, pipes and conduits for water, gas, heat, and power may be acquired by gift, devise, purchase, or condemnation in the manner provided by law.