1. An authority whose board members are appointed by one or more elected officials shall have the right to acquire by the exercise of the power of eminent domain any real property which it may deem necessary for a land clearance project or for its purposes under this law after the adoption by it of a resolution declaring that the acquisition of the real property described therein is necessary for such purposes. An authority may exercise the power of eminent domain in the manner and under the procedure provided for corporations in chapter 523 and acts amendatory thereof or supplementary thereto.
2. Property already devoted to a public use may be acquired in like manner, provided that no real property belonging to the municipality, the county or the state may be acquired without its consent.