The taking and condemnation of properties, facilities, and franchises, as authorized by this act, may, at the option of such cities, be made subject to the existing bonds, obligations, or other liabilities, liens, and encumbrances of the owners thereof, or to which such properties, facilities, and franchises may be subject; or such taking and condemnation may be free therefrom, or may be subject in part thereto and in part free therefrom, as any such city may elect.
53 P.S. § 15564