24 CFR § 58.57 - Lead agency designation.

If there are several agencies ready to assume the lead role, the responsible entity must make its decision based on the criteria in 40 CFR 1501.5(c). If the responsible entity and a Federal agency are unable to reach agreement, then the responsible entity must notify HUD (or the State, where applicable). HUD (or the State) will assist in obtaining a determination based on the procedure set forth in 40 CFR 1501.5(e).