Georgia Code Title 50. State Government § 50-39-15

(a) After the adoption by the authority of a resolution declaring that the acquisition of the real property described therein is necessary for the purposes of this chapter, the authority may exercise the power of eminent domain in the manner provided in Title 22; or it may exercise the power of eminent domain in the manner provided by any other applicable statutory provisions for the exercise of such power; provided, however, that the provisions of Article 7 of Chapter 16 of this title shall not be applicable to the exercise of the power of eminent domain by the authority. Property already devoted to public use may be acquired, except that no real property belonging to the state other than property acquired by or for the purposes of the Department of Transportation may be acquired without the consent of the state.

(b) Real property acquired by the authority in any manner for the purposes of this chapter shall not be subject to the exercise of eminent domain by any state department, division, board, bureau, commission, authority, or other agency or instrumentality of the executive branch of state government, or by any political subdivision of the state or any agency, authority, or instrumentality thereof, without the consent of the authority.