If a purchaser exercises rights under 15 U.S.C. 1703(b), (c), or (d) , but cannot reconvey the lot in substantially similar condition, the developer may subtract from the amount paid by the purchaser, and otherwise due to the purchaser under 15 U.S.C. 1703 , any diminished value in the lot caused by the acts of the purchaser.
12 C.F.R. § 1011.5