A lease under subsection (a) shall provide for the payment by the Secretary of Defense of consideration in an amount equal to 105 percent of the monthly rate of basic allowance for housing prescribed under
section 403(b) of title 37 for a member of the uniformed services in the pay grade of O–10 with dependents assigned to duty at the military installation on which the leased housing unit is located. A rate so established shall be considered the fair market value of the lease interest.