Wis. Stat. § 85.15: Property management.

(1) Subject to any prior action under s. 13.48 (14) (am) or 16.848 (1), the department may improve, use, maintain or lease any property acquired for highway, airport or any other transportation purpose until the property is actually needed for any such purpose and may permit use of the property for purposes and upon such terms and conditions as the department deems in the public interest.

(2) The department shall credit to the appropriation account under s. 20.395 (4) (ew) the amount, if any, by which moneys received in any year from the sale or lease of property acquired by the department exceeds $2,750,000. The department shall use 50 percent of any proceeds credited to this appropriation account from the sale or lease of any property to supplement the costs of management and operations of the district office of the department that initiated the sale or lease of that property.