Wis. Stat. § 346.61
In addition to being applicable upon highways, ss. 346.62 to 346.64 are applicable upon all premises held out to the public for use of their motor vehicles, all premises provided by employers to employees for the use of their motor vehicles and all premises provided to tenants of rental housing in buildings of 4 or more units for the use of their motor vehicles, whether such premises are publicly or privately owned and whether or not a fee is charged for the use thereof. Sections 346.62 to 346.64 do not apply to private parking areas at farms or single-family residences.
Wis. Stat. § 346.61
A privately owned parking lot was not included under this section. City of Kenosha v. Phillips, 142 Wis. 2d 549, 419 N.W.2d 236 (1988). A parking lot for patrons of a business is held out for the use of the public under this section. City of LaCrosse v. Richling, 178 Wis. 2d 856, 505 N.W.2d 448 (Ct. App. 1993).