Wis. Stat. § 703.265

(1)   If the revision or adoption of a building code or zoning ordinance prevents or substantially affects the construction of a unit or common elements as platted, the declarant may reasonably modify the condominium plat, by addendum, to the extent necessary to comply with the code or ordinance in order to construct the unit or common elements. (2)   If the revision or adoption of a building code or zoning ordinance prevents or substantially affects the reconstruction of a unit or common element as platted, the declarant, unit owner, or association, as appropriate, may reasonably modify the condominium plat, by addendum, to the extent necessary to comply with the code or ordinance in order to reconstruct the unit or common elements. (3)   An addendum made under this section shall be recorded as provided under s.