Wis. Stat. § 708.04
The removal, without the consent of the mortgagee or the mortgagee's assigns, of any building from any real estate upon which there is an unsatisfied mortgage, properly recorded, shall not destroy the lien of such mortgage upon such removed building, but the mortgagee or the mortgagee's assigns shall be entitled to recover the possession of the same in an action of replevin, from any person, and wherever the same may be situated, without regard to the question of the adequacy of the real estate remaining to pay the mortgage debt. If such removal be made by the mortgagor or with the mortgagor's consent, all reasonable expense incurred in recovering such building shall be added to, and collected as a part of, the mortgage debt.
Wis. Stat. § 708.04