The property over which an easement runs, in favor of another parcel of real estate, is known as a:

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Explanation:

An easement is a non-possessory right to use and/or enter onto the real property of another without possessing it. The dominant estate is the one benefiting from the easement and the servient is the one burdened by it. Said another way, the property "over which" an easement runs is the servient tenement, while the property whose easement "runs over" another is the dominant tenement.