Wis. Stat. § 707.03
A contract to purchase a time-share creates an interest in real estate, which, under s. 706.02(1) must be signed by or on behalf of the grantor in order to be valid. Section 707.46(1) (a) requires a time-share purchase contract to contain the actual date that the contract is executed by each party, which means that a valid time-share purchase contract must include the signature of both parties. Irrespective of any statutory right to cancel a valid contract, a party to an invalid contract may, under the common law, have it rescinded and be restored to the status quo. Ott v. Peppertree Resort Villas, Inc. 2006 WI App 77, 292 Wis. 2d 173, 716 N.W.2d 127, 04-1226.