Wis. Stat. § 1.025
The legislature consents to the conveyance by lease with option to purchase to the United States of the institution and the land on which it is located in the town of New Chester, Adams County, described as follows: The entire section 15, township 16 north, range 7 east of the fourth principal meridian, consisting of 640 acres, and upon the execution of said lease the state grants, cedes and confirms to the United States exclusive legislative jurisdiction over said place and tract, retaining concurrent jurisdiction solely to the extent that all legal process issued under the authority of the state may be served upon persons located on said place and tract. The authority granted in this section shall remain in effect for the duration of said lease and continue in effect in the event title passes to the United States at the termination of the lease.
Wis. Stat. § 1.025