If the property being listed is owned by the entireties, for the contract to be valid and enforceable it...

When property is owned by the entireties, it is a form of ownership that is available only to married couples, where both spouses have an equal and undivided interest in the property. For a contract concerning such property to be enforceable, it must be executed by both spouses. This requirement is rooted in the legal principle that both spouses are considered joint owners of the property. As a result, one spouse cannot independently bind the other to a contract related to the property without the other's consent.

The need for both spouses to sign the contract ensures that both individuals are fully aware of and agree to the terms regarding the property. This provision prevents potential disputes and reinforces the notion that both partners are equally responsible for the agreements made about their jointly owned asset. Thus, the execution by both spouses is crucial for the contract’s validity and enforceability.

Options like being oral in nature or having restrictions on the contract's duration aren't requirements specifically tied to the ownership structure of entireties. Recording the contract is not a condition for validity but rather a procedural step for public notice and does not affect enforceability in the context of ownership by the entirety.