Wis. Stat. § 229.54: Responsibility to sports and entertainment arena facilities.

(1) Neither the state, a sponsoring municipality, nor the most populous county in which the sponsoring municipality is located is responsible for equipping, maintaining, operating, improving, and repairing sports and entertainment arena facilities.

(2) The district is responsible only for equipping, maintaining, operating, improving, and repairing sports and entertainment arena facilities during the initial development and construction of the sports and entertainment arena facilities. If the professional basketball team or its affiliate breaches the non-relocation agreement or lease under s. 229.461, the district is responsible for equipping, maintaining, operating, and repairing sports and entertainment arena facilities during the remainder of the lease, but only from moneys received from the parent company of the professional basketball team, the professional basketball team, or its affiliate resulting from the breach of the non-relocation agreement or lease.