What form of ownership provides the most complete rights over real property?

The form of ownership that provides the most complete rights over real property is fee simple absolute. Fee simple absolute is the highest form of property ownership recognized at law, granting the owner full control and rights over the property. This includes the rights to use, sell, lease, or will the property to heirs without restrictions. It is characterized by having no limitations on the estate's duration, which means that it does not revert to any previous owner or come with conditions that could limit the owner's rights.

In contrast, a fee simple conditional can be subject to certain conditions or restrictions that, if violated, can result in the property reverting to a previous owner. A leasehold estate, while it provides the tenant with rights to use the property, is inherently temporary and does not grant ownership. Tenancy in common shares ownership among multiple individuals, who each hold an undivided interest in the property but may not exercise complete control over it independently.

Thus, fee simple absolute stands out as the form of ownership that ensures the most extensive rights and least restrictions for the property owner.