All proceedings or actions under any power of eminent domain pending at the time of the effective date of this act shall be completed in conformity with the laws in effect prior to such date.

If any part or parts of this act shall be held unconstitutional, such unconstitutionality shall not affect the validity of the remaining parts of this act. The legislature hereby declares that it would have passed the remaining parts of this act if it had known that such part or parts thereof would be declared unconstitutional.