Unity of Ownership An easement is extinguished where the freeholds of both the dominant and servient land come into the ownership of the same person. The relevant legal concept is 'unity of seisin', which means that both pieces of land must be owned by the same person, in the same capacity (eg not as freeholder of one, tenant of the other, or freeholder of one, trustee of the other). Therefore, if land was in the common ownership and occupation of A, the easements