We are asked to determine whether, in Wyoming, a commercial easement in gross is freely assignable. Declining the request to answer so broad a question, we affirm the decision of the district court on other grounds.
I. ISSUES
Appellants state the issues on appeal:
1. Is a commercial easement in gross an assignable easement?
2. Is the grantee of an easement in gross judicially estopped to deny its as-signability when he signs a stipulation in a prior proceeding which conveys to the heirs, executors and assigns?
Appellees restate the issue:
A Whether the easement granted to Francis and Elvira Thar in 1976 is assignable.
II. FACTS
In 1976, Edwin N. Moran (Moran),1 granted an easement across his land to Francis and Elvira Thar (the Thars). The easement provided access to a landlocked parcel that the Thars were leasing from the State of Wyoming. In 1993, the Thars purchased the parcel from the state, acquiring title in fee simple, and leased it to Gary Thar. This case arises out of an action for trespass brought by the Edwin N. Moran Revocable Family Trust against the Thars’ lessee. Moran maintains that the easement granted in 1976 is an easement in gross that is personal to the Thars and cannot be transferred to their lessee. The Thars insist that the easement is a commercial easement in gross and, as such, is an alienable property interest. Following a bench trial, the district *414court held that the easement is an easement in gross but that it was not assignable.
III. DISCUSSION
We choose not to answer the question of whether commercial easements in gross are freely alienable in Wyoming since more specific and appropriate grounds exist upon which to decide this case. Despite our refusal to fully consider this issue, we note research which indicates that questions regarding the assignability of easements in gross may be more readily resolved if counsel addresses the question of assignability within the four corners of the granting instrument. Farmer’s Marine Copper Works, Inc. v. City of Galveston, 757 S.W.2d 148, 151 (Tex.App.1988) (noting that parties may create an assignable easement in gross through an express assignment provision).
Turning our attention to the resolution of the case at hand, we observe that an easement cannot extend beyond the life of the estate it serves. Hoffman v. Savage, 15 Mass. 130, 131 (1818) (holding that an easement appurtenant to a freehold estate of a dowager expired with that estate); Leuthold v. John A. Stees Co., 141 Minn. 213, 169 N.W. 709, 710-11 (1918) (holding that an easement cannot be created in favor of an estate for years extending beyond the life of the estate); Ludwig v. Gosline, 191 N.J.Super. 188, 465 A.2d 946, 947 (1983) (holding that an easement by prescription may be obtained against the holder of a present interest, but that that prescriptive easement is subject to divestment if and when the property passes to the holder of a future interest); Newhoff v. Mayo, 48 NJ.Eq. 619, 23 A, 265, 267 (1891) (noting that when the dominant estate is a terminable estate, the right of passage ceases when that estate is terminated). In light of this rule, we hold that the easement serving the Thars’ leased lands expired with the leasehold estate.
Moran granted an easement to serve leased lands, not an easement to serve lands held in fee. When Elvira Thar acquired the leased lands in fee, the leasehold estate expired and the easement serving that estate was terminated. Unlike the district court, which did not decide the issue, we hold that the Thars’ easement expired with their leasehold interest in the state lands.
The Thars also argue that Moran is judicially estopped from denying the assignability of the easement. We need not consider this argument since the question of assigna-bility is not reached in our decision.
IV. CONCLUSION
The district court’s decision denying the use of the expired easement by the Thars’ lessee is affirmed. Since the easement has expired, the Thars must consider some other means of acquiring access to their landlocked parcel.
THOMAS, J., files a dissenting opinion.. The stipulation in which the easement was granted to Francis and Elvira Thar was executed by Edwin N. Moran, Nita C. Brennan, Ted Gas-sin and Edwin N. Moran as Administrator of the Estate of Blanche E. Moran. For convenience, we will identify Edwin N. Moran as the primary party.