The several public entities are authorized to and shall make or approve the payments required by Section 305(2) of the Uniform Act for litigation expenses actually incurred by any person, family, business, farm operation, or nonprofit organization which is the plaintiff in any inverse condemnation proceeding brought against an acquiring public entity in which judgment is rendered in favor of the plaintiff for real property taken by the acquiring public entity in its execution of any federal-aid project, the costs of which are now or hereafter financed in whole or in part from federal funds allocated to the acquiring public entity.