49 C.F.R. § 24.107 : Transportation — OFFICE OF THE SECRETARY OF TRANSPORTATION — UNIFORM RELOCATION ASSISTANCE AND REAL PROPERTY ACQUISITION FOR FEDERAL AND FEDERALLY-ASSISTED PROGRAMS — REAL PROPERTY ACQUISITION — 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.

49 C.F.R. § 24.107