Wis. Stat. § 823.21: Dilapidated buildings declared nuisances.

Any building which, under s. 66.0413 (1) (b) 1., has been declared so old, dilapidated or out of repair as to be dangerous, unsafe, unsanitary or otherwise unfit for human habitation or has been determined to be unreasonable to repair under s. 66.0413 (1) (b) 1. is a public nuisance and may be proceeded against under this chapter.