An item that was personal property but has been attached to and become part of the real property is known as:

A fixture is an item that was previously classified as personal property but has been permanently attached to real property, making it an inherent part of the property itself. This transformation typically occurs when the item is affixed in such a way that its removal would cause damage or substantial alteration to the structure or land. Common examples of fixtures include built-in appliances, light fixtures, and cabinets.

Understanding the concept of fixtures is essential in real estate transactions, as these items generally remain with the property when ownership is transferred, unlike personal property. This distinction is crucial during the transfer of property rights, ensuring clarity about what is included in the sale.

The other terms presented relate to different aspects of property but do not accurately describe the process of personal property becoming a permanent part of real estate. An accessory usually refers to a supplementary item that doesn't necessarily bind with the property in the same way as a fixture. An appurtenance is generally defined as a right or a privilege associated with the property, such as access rights or easements, rather than a tangible item. Incorporation refers more broadly to the process of something becoming legally part of a system or framework rather than specifically addressing property attachment.