Which of the following best defines an appurtenance?

An appurtenance refers to a right or privilege that is attached to and runs with the land, meaning it is inherently linked to the property itself and typically transfers with the ownership of the land. This definition encompasses various rights, including easements, rights of way, or other entitlements that enhance the value of the property. For example, if a property has a right of access to a body of water, that right is considered an appurtenance because it is tied to ownership of the land.

In contrast, property improvements that can be sold separately reflect physical enhancements or additions to the property, which do not inherently pertain to the concept of appurtenances. Similarly, a type of mortgage agreement pertains to financial arrangements rather than rights attached to the land. Services provided by real estate agencies are focused on the transactional aspects of property sales and do not relate to the definition of appurtenance. Thus, option B accurately describes the nature of appurtenances in the context of real estate law.