What type of property ownership involves both the land and any structures on it?

The correct choice pertains to "fee simple" ownership, which signifies the most complete form of property ownership recognized in real estate law. When someone holds property in fee simple, they retain full control over the land and any structures on it, which means they have rights to use, sell, lease, or transfer the property as they see fit. This ownership is characterized by its permanence and inheritable nature.

In contrast, leasehold ownership grants the right to use and occupy a property for a defined period under the terms of a lease, without actually owning the land. Cooperatives, or co-ops, involve ownership of shares in a corporation that owns the property, rather than direct ownership of the property itself. Time-shares allow multiple owners to use the property, typically for specified periods, but do not convey full ownership of the property. Thus, fee simple is the most comprehensive and traditional form of property ownership, integrating both land and any structures built upon it.