49 CFR 24.107: Certain litigation expenses.

The owner of the real property shall be reimbursed for any reasonable expenses, including reasonable attorney, appraisal, and engineering fees, which the owner actually incurred because of a condemnation proceeding, if:

(a) The final judgment of the court is that the agency cannot acquire the real property by condemnation;

(b) The condemnation proceeding is abandoned by the agency other than under an agreed-upon settlement; or

(c) The court having jurisdiction renders a judgment in favor of the owner in an inverse condemnation proceeding or the agency effects a settlement of such proceeding.