No military department may acquire real property not owned by the United States unless the acquisition is expressly authorized by law. The foregoing limitation shall not apply to the acceptance by a military department of real property acquired under the authority of the Administrator of General Services to acquire property by the exchange of Government property pursuant to subtitle I of title 40 and division C (except sections 3302, 3501(b), 3509, 3906, 4710, and 4711) of subtitle I of title 41.

The maximum amount payable as a commission on a contract for the purchase of land from funds appropriated for the Department of Defense is two percent of the purchase price.

The limitations on reduction in scope or increase in cost of a land acquisition in subsection (c) do not apply if the reduction in scope or the increase in cost, as the case may be, is approved by the Secretary concerned and a notification of the facts relating to the proposed reduced scope or increased cost (including a statement of the reasons therefor) is submitted by the Secretary concerned to the congressional defense committees. A contract for the acquisition may then be awarded only after the end of the 14-day period beginning on the date the notification is received by the committees in an electronic medium pursuant to section 480 of this title.

The Secretary concerned shall promptly pay any deficiency judgment against the United States awarded by a court in an action for condemnation of any interest in land or resulting from a final settlement of an action for condemnation of any interest in land. Payments under this subsection may be made from funds available to the Secretary concerned for military construction projects and without regard to the limitations of subsections (c) and (d).