Defeasible Estates

Chapter 9 established the fee simple absolute as the estate of potentially infinite duration, freely alienable and fully inheritable, and unqualified by any condition of defeasance. This chapter examines the family of estates in which that final quality — the freedom from defeasance — is deliberately withheld. A defeasible estate is a fee simple in every other respect: it is a proprietary estate in land, of potentially infinite duration, freely alienable, and inheritable and devisable. But it is qualified by a condition on the occurrence (or nonoccurrence) of which the estate will terminate or become divestible. Because the tenant's estate is not potentially infinite in the unconditional sense of the fee simple absolute, the ownership of the land is not exhausted by the present estate. The remainder of the ownership is held as a correlative future interest — a possibility of reverter, a right of entry, or an executory interest — which becomes possessory if and when the specified event occurs. This chapter defines the three defeasible fees, traces their historical development, examines the language by which each is created, sets out the correlative future interests, and identifies the modern statutory and judicial modifications that have narrowed their operation.

1. A defeasible estate is a fee simple qualified by a condition of defeasance. It is a proprietary estate in land, potentially infinite in duration, freely alienable, and inheritable and devisable, but subject to a condition on the occurrence of which it will terminate or become divestible.
2. Anglo-American law recognizes three defeasible fees. The fee simple determinable terminates automatically on the occurrence of the stated event. The fee simple subject to a condition subsequent continues until the grantor (or successor) elects to exercise the reserved right of entry. The fee simple subject to an executory limitation is divested — automatically or on election, according to the language — in favor of a third-person taker.
3. Each defeasible fee has a correlative future interest. The fee simple determinable leaves a possibility of reverter in the grantor. The fee simple subject to a condition subsequent leaves a right of entry (also called a power of termination) in the grantor. The fee simple subject to an executory limitation is followed by an executory interest in a third person. Restatement (First) of Property §§ 154–158; Restatement (Third) of Property (Wills and Other Donative Transfers) §§ 25.1–25.5.
4. Automatic termination is distinguished from optional termination. The fee simple determinable terminates by operation of law on the occurrence of the stated event; no act of the grantor is required. The fee simple subject to a condition subsequent, by contrast, does not terminate on the occurrence of the condition; it becomes divestible, and the grantor must affirmatively re-enter or bring suit to terminate the tenant's estate.
5. Language of duration signals a determinable fee; language of condition signals a fee subject to a condition subsequent. Words such as “so long as,” “while,” “during,” and “until” characteristically create a fee simple determinable. Words such as “provided that,” “on condition that,” “but if,” and “if it happens that,” coupled with an express right of re-entry, characteristically create a fee simple subject to a condition subsequent.
6. Forfeitures are disfavored. Where the language of a conveyance is ambiguous, courts prefer the construction that avoids forfeiture. In many jurisdictions this preference produces a construction in favor of the fee simple subject to a condition subsequent (which requires an affirmative election) over the fee simple determinable (which operates automatically), and a construction in favor of a covenant (personal obligation) over any defeasible fee.
7. The correlative future interests are governed by distinct rules. At common law the possibility of reverter and the right of entry are ordinarily descendible but not devisable or alienable inter vivos, though modern statutes in many jurisdictions have made both freely transferable. The executory interest, being a springing or shifting interest recognized only after the Statute of Uses (1536) and the Statute of Wills (1540), is subject to the Rule Against Perpetuities and to the modern statutory refinements of that rule.
8. Modern statutes have narrowed the operation of defeasible fees. Many jurisdictions have enacted marketable title acts, dormant mineral acts, and specific statutes of limitation that extinguish stale possibilities of reverter and rights of entry after a stated period unless a preservation notice is filed. Other statutes require that a possibility of reverter or right of entry be recorded to bind successors.
9. The defeasible fees remain the standard vehicle for enforcing charitable, conservation, and public-use restrictions. Charitable conveyances “so long as” a stated purpose is pursued, conveyances to municipalities for park or school use, and conveyances subject to conservation and environmental restrictions continue to be drafted as defeasible fees, though the modern conservation easement (Restatement (Third) of Property (Servitudes) §§ 1.6, 8.5) has increasingly displaced the defeasible fee in this role.
10. The Rule Against Perpetuities constrains only the executory interest. Because the possibility of reverter and the right of entry are retained by the grantor and are treated as vested at the moment of conveyance, they are not subject to the Rule Against Perpetuities. The executory interest, held by a third person, is subject to the Rule and will be void from the outset unless it must vest, if at all, within lives in being plus twenty-one years.

• Define the family of defeasible estates and identify the three principal defeasible fees recognized under Anglo-American law.
• Distinguish the fee simple determinable, the fee simple subject to a condition subsequent, and the fee simple subject to an executory limitation, both in the language that creates them and in their operational consequences.
• Identify and analyze each correlative future interest: the possibility of reverter, the right of entry (power of termination), and the executory interest.
• Trace the historical development of the defeasible fees from medieval feudal tenure through De Donis (1285), the Statute of Uses (1536), and the Statute of Wills (1540) to the modern American estate.
• Apply the canons of construction — the judicial preference against forfeitures, the presumption in favor of a covenant over a condition, and the strict construction of conditions of defeasance.
• Analyze the operation of the Rule Against Perpetuities as it applies to executory interests, and identify the reasons the possibility of reverter and the right of entry are not subject to the Rule.
• Identify the modern statutory modifications — marketable title acts, dormant mineral acts, recording requirements, and specific statutes of limitation — that have narrowed the operation of the defeasible fees.
• Diagnose and correct the recurring misconceptions concerning defeasible estates and their correlative future interests.

• 2 William Blackstone, Commentaries on the Laws of England *109–*156 (1766).
• 4 James Kent, Commentaries on American Law *121–*135 (1830).
• Edward Coke, The First Part of the Institutes of the Laws of England (Coke on Littleton) §§ 325–347 (1628).
• John Chipman Gray, The Rule Against Perpetuities §§ 41–113 (4th ed. 1942).
• Lewis M. Simes & Allan F. Smith, The Law of Future Interests §§ 281–299, 1234–1258 (2d ed. 1956).
• Thomas F. Bergin & Paul G. Haskell, Preface to Estates in Land and Future Interests 38–75 (2d ed. 1984).
• Roger A. Cunningham, William B. Stoebuck & Dale A. Whitman, The Law of Property §§ 2.4–2.7 (3d ed. 2000).
• Frederick Pollock & Frederic W. Maitland, The History of English Law Before the Time of Edward I, vol. 2, at 12–29 (2d ed. 1898).
• S. F. C. Milsom, Historical Foundations of the Common Law 178–210 (2d ed. 1981).
• A. W. B. Simpson, A History of the Land Law 88–102, 208–241 (2d ed. 1986).
• Sir John Baker, An Introduction to English Legal History 291–319 (5th ed. 2019).
• Susan F. French, Toward a Modern Law of Servitudes: Reweaving the Ancient Strands, 55 S. Cal. L. Rev. 1261 (1982).

A defeasible estate is a fee simple qualified by a condition on the occurrence of which the estate will terminate or become divestible. It is proprietary, potentially infinite, freely alienable, and fully devisable and descendible — every one of the incidents established for the fee simple absolute in Chapter 9 — save one: it is not unqualified. The withholding of that single incident produces the defining structural consequence of the entire family: the ownership of the land is not exhausted by the present estate. Because the tenant's estate may terminate, the remainder of the ownership must reside somewhere else. It resides in a correlative future interest, retained by the grantor or created in a third person, which becomes possessory if and when the specified condition occurs.

The defeasible estates therefore stand in structural contrast to the fee simple absolute. The fee simple absolute exhausts the whole ownership and leaves no future interest; the defeasible fee retains a present estate of substantial economic magnitude but leaves a future interest — a possibility of reverter, a right of entry, or an executory interest — of variable but nonzero value. Every conveyance that creates a defeasible fee simultaneously creates a future interest; the two are correlative and cannot be understood in isolation. This chapter accordingly treats the defeasible present estates and their correlative future interests as an integrated whole.

Anglo-American law tolerates conditional ownership because the power to attach conditions to a conveyance advances legitimate objectives — the perpetuation of charitable and public uses, the enforcement of neighborhood restrictions, the protection of environmental and historical resources, and the preservation of family expectations across generations. At the same time, conditional ownership imposes real costs: it clouds title, discourages productive investment in the affected parcel, complicates alienation, and — where the condition operates in favor of the dead hand — subordinates the interests of the living to the preferences of the long dead.

The doctrinal architecture of the defeasible fees reflects a persistent effort to balance these competing considerations. The law permits the creation of defeasible fees, but subjects them to strict construction and to a settled judicial preference against forfeiture. It recognizes the correlative future interests, but constrains executory interests by the Rule Against Perpetuities and, in many jurisdictions, terminates stale possibilities of reverter and rights of entry after a stated period. The result is a body of doctrine that gives partial effect to the grantor's conditions while protecting the reliance interests of successors and the productive use of the land.

Anglo-American law recognizes three principal defeasible fees. Each is a fee simple qualified by a condition, and each is followed by a correlative future interest. The three differ in the mode of termination and in the identity of the future-interest holder.

First, the fee simple determinable terminates automatically on the occurrence of the stated event. The grantor's future interest is the possibility of reverter, which becomes possessory by operation of law at the instant the condition occurs. Second, the fee simple subject to a condition subsequent does not terminate on the occurrence of the condition; it becomes divestible. The grantor's future interest is the right of entry (also called the power of termination), which must be affirmatively exercised by re-entry or by suit. Third, the fee simple subject to an executory limitation is divested — automatically or on election, according to the language — in favor of a third person, who holds an executory interest. The three fees are structurally parallel but operationally distinct, and the distinctions have material practical consequences.

The defeasible fees are among the oldest institutions of the English common law. The idea that a fee might be granted on a condition, with the land to revert to the grantor on breach, is present in the earliest sources and reflects the tenurial premise of medieval landholding, in which every fee was held on terms and every tenant owed continuing obligations. What was novel was not the condition itself but the doctrinal apparatus that developed around it: the distinction between limitation and condition, the recognition of automatic termination and re-entry as distinct modes of enforcement, and the eventual recognition of executory interests in third persons after the Statute of Uses (1536) and the Statute of Wills (1540).

The classical distinction between the fee simple determinable and the fee simple subject to a condition subsequent crystallized in the medieval treatises and was firmly established by the time of Littleton (c. 1481) and Coke (1628). Littleton § 325 explains the determinable fee as a fee limited to endure only “so long as” or “while” a specified circumstance obtains; Coke on Littleton § 329 explains the fee on condition subsequent as a fee subject to a defeasance clause on breach of which the grantor may re-enter. The two forms served overlapping functions but produced different operational consequences, and the choice between them was left to the drafter.

The executory interest is of later origin. Before the Statute of Uses (1536) the common law refused to recognize a springing or shifting future interest in a third person following a fee simple, because such an interest violated the classical rule that a fee could not follow a fee and could not vest in derogation of a prior grant. The equitable use, however, was recognized in Chancery and permitted the creation of such interests behind the legal estate. The Statute of Uses executed the use into legal estates and, in doing so, brought the springing and shifting interests into the common law. The Statute of Wills (1540) confirmed that such interests could be created by devise. From that point the executory interest became a settled feature of the law, subject only to the constraints — chiefly the Rule Against Perpetuities — that developed to prevent its use for indefinite dead-hand control.

The American reception preserved the three defeasible fees and their correlative future interests. Nineteenth-century American courts inherited the classical distinctions and applied them to the standard American forms of charitable, public-use, and family conveyance. Twentieth-century developments have narrowed the operation of the defeasible fees in several respects — the marketable title acts of the mid-twentieth century extinguish stale possibilities of reverter and rights of entry; the specific statutes of limitation in a number of jurisdictions require re-entry within a stated period; and the modern conservation easement has partly displaced the defeasible fee in its historical role of enforcing environmental and public-use restrictions. But the classical doctrine remains the analytical framework within which conditional ownership is understood.

The fee simple determinable is a fee simple limited to endure only so long as a specified state of affairs obtains. On the occurrence (or nonoccurrence) of the stated event, the estate terminates automatically by operation of law. No act of the grantor is required; no re-entry, election, or suit is necessary; the estate simply ends, and the possibility of reverter matures into a present possessory estate in the grantor.

The classical form of words is a limitation of duration: “to A and his heirs so long as the premises are used for school purposes,” “to A while the land is farmed,” “to A during the maintenance of the church,” “to A until the sale of intoxicating liquors on the premises.” Each formulation ties the endurance of the estate to a condition and provides no separate defeasance clause. The estate is limited in its very grant to endure only for the duration of the specified state of affairs.

A fee simple determinable is created by durational language. The characteristic terms — “so long as,” “while,” “during,” “until” — are treated by courts as words of limitation that measure the duration of the estate and produce automatic termination on the occurrence of the specified event. See Restatement (First) of Property § 44. The estate must be created by clear and unambiguous language: because the operational consequence is severe (immediate termination without notice or election), courts are reluctant to construe ambiguous language as creating a determinable fee where a less drastic construction is available.

A conveyance that combines durational language with an express clause reserving a right of re-entry presents a construction question. The prevailing view treats the durational language as controlling and the reserved right of re-entry as either redundant or as an alternative remedy; the estate is a fee simple determinable, and the reversion is by operation of law rather than by re-entry. A minority view treats the reserved right of re-entry as controlling and characterizes the estate as a fee simple subject to a condition subsequent; this construction reflects the judicial preference against forfeiture and against automatic termination.

The correlative future interest that follows a fee simple determinable is the possibility of reverter. It is the interest retained by the grantor (or by the grantor's successors) that becomes possessory automatically on the termination of the determinable fee. It is not, strictly speaking, a reversion, because a reversion follows a lesser estate (a life estate or leasehold) and is certain to become possessory; the possibility of reverter follows a fee (and hence a potentially infinite estate) and is contingent on the occurrence of the specified event. See Restatement (First) of Property § 154; Restatement (Third) of Property (Wills and Other Donative Transfers) § 25.3.

At classical common law the possibility of reverter was descendible (it passed to the grantor's heirs on death intestate) but was neither devisable nor alienable inter vivos. This restriction reflected the medieval characterization of the possibility of reverter as a mere expectancy rather than a present interest. Modern American statutes in many jurisdictions have made the possibility of reverter freely transferable, both inter vivos and by will, on the theory that free transferability serves the general policy in favor of the alienability of interests in land. The reader should consult the applicable statute in each jurisdiction; the common-law rule survives in a diminishing minority.

Because the possibility of reverter is treated as vested at the moment of the original conveyance — vested in the grantor, that is — it is not subject to the Rule Against Perpetuities. This treatment is often criticized as anomalous, since the possibility of reverter may in fact remain contingent and unexercised for centuries. Several jurisdictions have accordingly enacted marketable title acts or specific statutes of limitation that extinguish possibilities of reverter after a stated period (typically thirty or forty years) unless the holder files a notice of preservation. These statutes function as substitutes for the Rule and are designed to clear stale interests from titles.

The fee simple subject to a condition subsequent is a fee simple that continues indefinitely but is subject to a clause of defeasance on the occurrence of which the grantor (or the grantor's successor) may re-enter and terminate the tenant's estate. The critical operational feature of this estate — the feature that distinguishes it from the fee simple determinable — is that the estate does not terminate on the occurrence of the condition. It becomes divestible; the grantor acquires the right, but not the duty, to terminate. Unless and until the grantor affirmatively exercises the right of entry, the tenant's estate continues, and the tenant retains full possession, use, and enjoyment of the land.

The classical form of words combines a grant in fee with a proviso of defeasance and an express reservation of the right of re-entry: “to A and his heirs, provided that if the premises are used for the sale of intoxicating liquors, the grantor may re-enter and terminate the estate hereby granted.” The critical elements are (a) the grant of a fee simple, (b) a defeasance clause introduced by conditional language (“provided that,” “on condition that,” “but if,” “if it happens that”), and (c) an express reservation of the right of re-entry in the grantor. In the absence of the express reservation, many courts will treat the language as merely a covenant giving rise to damages rather than as a condition of defeasance giving rise to forfeiture. See Restatement (First) of Property § 45.

The correlative future interest that follows a fee simple subject to a condition subsequent is the right of entry, also called the power of termination. It is a right — not a duty — vested in the grantor to terminate the tenant's estate on the occurrence of the specified condition. The right must be affirmatively exercised, either by physical re-entry (the classical method) or by suit for possession (the modern method). Until the right is exercised, the tenant's estate continues in full. See Restatement (First) of Property § 155; Restatement (Third) of Property (Wills and Other Donative Transfers) § 25.4.

At classical common law the right of entry, like the possibility of reverter, was descendible but not devisable or alienable inter vivos. Modern American statutes in many jurisdictions have made the right of entry freely transferable. In addition, several jurisdictions have imposed statutes of limitation that require the right of entry to be exercised within a stated period after the occurrence of the condition, on pain of extinguishment. These statutes are designed to prevent the indefinite postponement of forfeiture and to encourage the prompt resolution of title disputes.

The right of entry is not subject to the Rule Against Perpetuities, for the same reason that the possibility of reverter is not: it is treated as vested in the grantor at the moment of the original conveyance. This treatment is subject to the same criticisms and the same statutory correctives as the possibility of reverter, and the marketable title acts that extinguish stale possibilities of reverter typically extinguish stale rights of entry as well.

Because the right of entry does not operate automatically, the grantor must elect whether to exercise it. Failure to exercise the right within a reasonable time (or within a specific statutory period, where one is prescribed) may result in waiver or estoppel. Acceptance of rent or other performance after the occurrence of the condition, express or implied acquiescence in the tenant's continued possession, and delay coupled with the tenant's substantial improvement of the land are the classical grounds of waiver. See Restatement (First) of Property § 561. The doctrine of waiver protects the tenant's reliance interests and reinforces the general judicial policy against forfeiture.

The fee simple subject to an executory limitation is a fee simple that will be divested, on the occurrence of a specified event, in favor of a third person (not the grantor). It is the third of the three defeasible fees, and it differs from the first two chiefly in the identity of the future-interest holder: the correlative future interest is not retained by the grantor but is created in a third party, who takes as executory interest holder.

The classical form of words is: “to A and his heirs, but if the premises cease to be used for school purposes, then to B and his heirs.” The words “but if” introduce the divesting event, and the phrase “then to B and his heirs” creates the executory interest in the third person. Alternative formulations use “provided that” and similar conditional language coupled with the gift-over. The operational consequence is that on the occurrence of the divesting event, A's fee is cut short and B (or B's successor) takes the fee. Depending on the language and the applicable state law, divestment may be automatic (in which case B's interest is treated as a shifting or springing executory interest that vests automatically) or may require B's election (in which case B's interest resembles a right of entry held by a third person). The default construction favors automatic divestment. See Restatement (First) of Property § 46; Restatement (Third) of Property (Wills and Other Donative Transfers) § 25.2.

The executory interest is a future interest, created in a person other than the grantor, that becomes possessory by divesting a prior estate. It is either shifting (if it divests an estate held by a person other than the grantor) or springing (if it divests an estate held by the grantor). The executory interest is of post-medieval origin: it was recognized in equity behind the use, brought into the common law by the Statute of Uses (1536), and confirmed as a testamentary interest by the Statute of Wills (1540). See Restatement (First) of Property § 158; Restatement (Third) of Property (Wills and Other Donative Transfers) § 25.5.

Because the executory interest is held by a third person rather than by the grantor, it is subject to the Rule Against Perpetuities. An executory interest is void from the outset unless it must vest, if at all, within lives in being at the creation of the interest plus twenty-one years. This is a substantial constraint on the defeasible fee subject to an executory limitation, and it is the reason that many long-term conditional gifts are drafted as fee simple determinable followed by a possibility of reverter (with a gift-over on some other theory) rather than as fee simple subject to an executory limitation.

The Rule Against Perpetuities has been modified in most American jurisdictions by the Uniform Statutory Rule Against Perpetuities (which validates any interest that in fact vests within ninety years) and by wait-and-see doctrine (which validates any interest that in fact vests within the classical period). Many jurisdictions have also enacted specific statutes exempting charitable-to-charitable gifts-over from the Rule, on the theory that such gifts serve continuing public purposes and should not be defeated by the classical constraints. The details of these modifications are examined in the chapters on future interests and perpetuities.

The three defeasible fees may be distinguished along four axes. First, the mode of termination: the fee simple determinable terminates automatically; the fee simple subject to a condition subsequent becomes divestible on election; the fee simple subject to an executory limitation is divested automatically (default) in favor of a third person. Second, the identity of the future-interest holder: the possibility of reverter and the right of entry are retained by the grantor; the executory interest is held by a third person. Third, the applicable perpetuities rule: the possibility of reverter and the right of entry are exempt from the Rule Against Perpetuities; the executory interest is subject to it. Fourth, the language of creation: durational language characteristically creates a fee simple determinable; conditional language coupled with an express right of re-entry characteristically creates a fee simple subject to a condition subsequent; conditional language coupled with a gift-over to a third person characteristically creates a fee simple subject to an executory limitation.

These distinctions have significant practical consequences. The choice among the three fees affects the timing of forfeiture, the identity of the successor, the availability of waiver, the applicability of statutes of limitation, and the enforceability of the condition against remote takers. A drafter who understands the distinctions and articulates them clearly in the conveyance produces an instrument whose operation is predictable; a drafter who confuses the categories produces an instrument that is likely to be construed against the intended forfeiture and in favor of the tenant.

Where the language of a conveyance is ambiguous, several settled canons guide construction. The overriding canon is that forfeitures are disfavored. Ambiguous language will be construed, wherever possible, to avoid forfeiture altogether. A conveyance that might be read either as creating a defeasible fee or as imposing a covenant enforceable in damages will typically be construed as a covenant, because damages are a less drastic remedy than forfeiture.

A second canon is that a fee simple subject to a condition subsequent is preferred over a fee simple determinable, because the former requires an affirmative election by the grantor and thereby permits the doctrine of waiver to soften the effect of the condition. Where the language is genuinely ambiguous between the two, courts often construe it as creating a fee simple subject to a condition subsequent. A third canon is that the grantor's intention governs, but that intention is to be gathered from the four corners of the instrument, read in light of the surrounding circumstances at the time of the conveyance.

Finally, courts distinguish sharply between conditions of defeasance and personal covenants. A promise by the grantee to use the premises for a stated purpose is not, without more, a condition of defeasance; it is a covenant, enforceable in damages against the promissor but not producing forfeiture. To create a condition of defeasance the drafter must use language that unmistakably ties the endurance or continuation of the estate to the specified condition. See Restatement (First) of Property § 45 cmt. a; Restatement (Third) of Property (Servitudes) § 3.1.

The defeasible fees remain the traditional vehicle for enforcing charitable and public-use restrictions. A conveyance “to the town so long as the premises are used for a public park,” “to the church so long as the premises are used for religious worship,” or “to the school district so long as the premises are used for a public school” creates a fee simple determinable coupled with a possibility of reverter. The grantor's expectation is that the possibility of reverter will operate as an incentive to continued charitable use and, on cessation, will restore the land to the grantor's family.

This traditional pattern has been substantially displaced in modern practice by the conservation easement and by charitable trust structures. The conservation easement (Restatement (Third) of Property (Servitudes) §§ 1.6, 8.5; Uniform Conservation Easement Act) permits the imposition of enforceable restrictions on the use of land without the operational hazards of the defeasible fee — chiefly the risk of forfeiture on a technical breach and the clouded title produced by a long-outstanding possibility of reverter. The charitable trust permits comparable results with the added flexibility of the cy pres doctrine, which allows the trust purpose to be modified when the original purpose becomes impossible or impracticable. See Restatement (Third) of Trusts § 67.

Environmental and conservation restrictions — restrictions requiring preservation of open space, prohibiting subdivision, or restricting development — have historically been drafted as defeasible fees but are now more commonly drafted as conservation easements. The conservation easement offers three principal advantages over the defeasible fee: (a) enforceability by a third-party holder (typically a land trust or governmental body), which provides a reliable enforcement mechanism; (b) tax deductibility of the qualified conservation contribution under I.R.C. § 170(h), which provides economic incentives for the landowner; and (c) freedom from the operational hazards of the defeasible fee. The reader interested in the modern law of environmental restrictions should consult the treatment of servitudes and conservation easements in the servitudes chapters.

Several categories of modern statute have narrowed the operation of the defeasible fees. The marketable title acts, enacted in a substantial number of American jurisdictions, extinguish possibilities of reverter and rights of entry after a stated period (typically thirty to forty years) unless the holder files a notice of preservation. These statutes function as substitutes for the Rule Against Perpetuities in respect of the grantor-held future interests and are designed to clear stale interests from titles.

Specific statutes of limitation in some jurisdictions require the right of entry to be exercised within a stated period after the occurrence of the condition, on pain of extinguishment. Other statutes require possibilities of reverter and rights of entry to be recorded to bind successors, or impose transfer taxes on the exercise of such interests. The dormant mineral acts perform an analogous function in respect of severed mineral interests. The reader should consult the applicable statute in each jurisdiction; the classical common-law rules survive in modified form.

Modern drafting practice reflects these statutory modifications. Where a conservation or public-use restriction is intended to endure indefinitely, the drafter should consider whether the restriction is better structured as a conservation easement, a charitable trust, or a set of enforceable covenants and servitudes, rather than as a defeasible fee. Where a defeasible fee is nevertheless the chosen vehicle, the drafter should attend to the applicable marketable title act, the applicable perpetuities modifications, and the recording requirements, and should draft the condition and the correlative future interest with the precision that the classical doctrine requires.

The Anglo-American doctrine of defeasible fees has no exact analogue in the civilian tradition. The civilian conception of ownership (dominium) treats ownership as unitary and indivisible; conditional ownership is uncommon and is generally treated as a species of resolutive condition on a contract of sale rather than as a modification of the underlying property interest. The Anglo-American willingness to fragment ownership into estates and to permit the grantor to attach conditions of defeasance reflects the medieval tenurial premise that every fee is held on terms, and the doctrine of estates that grew out of that premise.

Within the common-law world, the American doctrine of defeasible fees remains closest to the English classical doctrine, though several English statutory reforms — chiefly the Law of Property Act 1925 — have simplified the English law of estates and reduced the practical importance of the defeasible fee in modern English practice. Australian and Canadian law preserve the classical distinctions but have introduced various statutory refinements analogous to the American marketable title acts.

The classification of a conveyance as creating one or another of the defeasible fees has substantial practical consequences for drafters, title examiners, litigators, and estate planners.

• Deed drafting. A drafter intending to create a defeasible fee must use language that unmistakably ties the endurance or divestment of the estate to the specified condition, and must select the appropriate future-interest structure. Durational language (“so long as,” “while,” “until”) creates a determinable fee with a possibility of reverter; conditional language coupled with an express reservation of re-entry creates a fee subject to a condition subsequent with a right of entry; conditional language coupled with a gift-over creates a fee subject to an executory limitation with an executory interest. Ambiguity is likely to be resolved against forfeiture.
• Title examination. The title examiner must identify any outstanding possibility of reverter, right of entry, or executory interest that burdens the fee. The applicable marketable title act, statute of limitations, and recording statute must be consulted to determine whether the future interest remains enforceable. Where a defeasible fee is in the chain of title, the examiner must consider whether the specified condition has occurred and, if so, whether the correlative future interest has been exercised or has been extinguished.
• Charitable and public-use conveyances. Where a charitable, public-use, or conservation restriction is intended, the drafter should consider whether the restriction is better structured as a conservation easement, a charitable trust, or a set of enforceable servitudes, rather than as a defeasible fee. The defeasible fee remains available but is often not the optimal vehicle.
• Estate planning. Defeasible fees may be used in family dispositions to condition a beneficiary's ownership on the pursuit of a specified course of conduct, but the tax consequences (including gift, estate, and generation-skipping transfer tax consequences) and the perpetuities constraints must be carefully considered. In most cases the trust is a more flexible vehicle for conditional dispositions in the family context.
• Litigation. Litigation concerning defeasible fees typically centers on three questions: whether the language of the conveyance created a condition of defeasance or a mere covenant; whether the specified condition has in fact occurred; and whether the correlative future interest has been exercised, extinguished, or waived. Each of these questions is fact-intensive and often outcome-determinative.

Because the defeasible fees combine features of the fee simple absolute with features of the future-interest system, they attract several persistent misconceptions that must be corrected before the doctrine may be applied with confidence.

1. “The fee simple determinable and the fee simple subject to a condition subsequent are the same estate.” They are not. The fee simple determinable terminates automatically on the occurrence of the specified event; the fee simple subject to a condition subsequent becomes divestible only, and the grantor must affirmatively exercise the right of entry. The distinction affects the timing of forfeiture, the availability of waiver, and the operation of statutes of limitation.
2. “A covenant in a deed operates as a condition of defeasance.” A covenant is a personal promise enforceable in damages; it does not, without more, produce forfeiture. To create a condition of defeasance the drafter must use language that unmistakably ties the endurance or continuation of the estate to the specified condition. Ambiguous language is typically construed as a covenant rather than a condition, in accordance with the judicial preference against forfeiture.
3. “All defeasible-fee future interests are subject to the Rule Against Perpetuities.” Only the executory interest is subject to the classical Rule. The possibility of reverter and the right of entry are treated as vested in the grantor at the moment of the original conveyance and are exempt from the Rule, though many jurisdictions have enacted marketable title acts and specific statutes of limitation that perform an analogous function.
4. “The possibility of reverter and the right of entry cannot be transferred inter vivos.” That was the classical common-law rule, and it survives in a diminishing minority of American jurisdictions. Most jurisdictions have made both interests freely transferable by statute. The applicable statute must be consulted in each jurisdiction.
5. “The fee simple determinable terminates only when the grantor learns of the breach.” No. The estate terminates automatically on the occurrence of the specified event, regardless of the grantor's knowledge. The grantor's later actions may bear on the availability of ejectment or on damages, but the termination itself is by operation of law.
6. “A charitable or public-use restriction is best drafted as a defeasible fee.” Modern practice increasingly favors the conservation easement, the charitable trust, and the enforceable servitude, each of which avoids the operational hazards of the defeasible fee. The defeasible fee remains available but is rarely the optimal vehicle for a modern conservation or charitable disposition.
7. “A defeasible fee is a lesser estate than the fee simple absolute.” Not in the ordinary sense. A defeasible fee is a fee simple: potentially infinite, freely alienable, fully inheritable and devisable, and carrying every incident of the fee simple absolute save the freedom from defeasance. It is not a life estate, not a leasehold, and not a fee tail. Its qualification affects the probability of endurance, not the character of the estate as a fee.
8. “The correlative future interest becomes possessory only after the grantor sues.” That is true only of the right of entry. The possibility of reverter operates by operation of law; the executory interest ordinarily operates automatically. Only the right of entry requires an affirmative act of the future-interest holder.

This chapter has developed the family of defeasible estates as fees simple qualified by conditions of defeasance. Each defeasible fee is a proprietary estate in land, potentially infinite in duration, freely alienable, and fully inheritable and devisable, and carries every incident of the fee simple absolute save the freedom from defeasance. Because the estate is not unqualified, the ownership of the land is not exhausted by the present estate, and every defeasible fee is accompanied by a correlative future interest.

Anglo-American law recognizes three defeasible fees. The fee simple determinable terminates automatically on the occurrence of the specified event; the correlative future interest is the possibility of reverter, retained by the grantor. The fee simple subject to a condition subsequent becomes divestible on the occurrence of the specified event but does not terminate until the grantor affirmatively exercises the reserved right of entry (power of termination). The fee simple subject to an executory limitation is divested — automatically or on election, according to the language — in favor of a third person, who takes as executory interest holder.

The three defeasible fees are distinguished by the mode of termination, the identity of the future-interest holder, the applicable perpetuities rule, and the language of creation. Durational language (“so long as,” “while,” “until”) creates a determinable fee; conditional language coupled with an express reservation of re-entry creates a fee subject to a condition subsequent; conditional language coupled with a gift-over to a third person creates a fee subject to an executory limitation.

The historical development of the defeasible fees traces the classical doctrine from medieval English law through De Donis (1285), the Statute of Uses (1536), and the Statute of Wills (1540) to the modern American estate. The American reception preserved the three defeasible fees; twentieth-century developments — marketable title acts, specific statutes of limitation, recording requirements, and the modern conservation easement — have narrowed their operation but have not displaced the classical framework.

Judicial construction of ambiguous conveyances is governed by the settled canons that forfeitures are disfavored, that a fee simple subject to a condition subsequent is preferred over a fee simple determinable, and that the grantor's intention governs but is to be gathered from the four corners of the instrument. The Rule Against Perpetuities constrains the executory interest but not the possibility of reverter or the right of entry, though the latter interests are constrained by statutory limitation and marketable title acts in many jurisdictions.

The chapter that follows examines the fee tail — the estate limited to a designated line of issue — and the modern rules governing its abolition or conversion in nearly every American jurisdiction. The reader now equipped with the framework of the defeasible fees is prepared to understand the fee tail as another qualified variant of the fee simple with its own historical development and its own doctrinal apparatus.

• 2 William Blackstone, Commentaries on the Laws of England *109–*156 (1766).
• 4 James Kent, Commentaries on American Law *121–*135 (1830).
• Edward Coke, The First Part of the Institutes of the Laws of England (Coke on Littleton) §§ 325–347 (1628).
• John Chipman Gray, The Rule Against Perpetuities §§ 41–113 (4th ed. 1942).
• Lewis M. Simes & Allan F. Smith, The Law of Future Interests §§ 281–299, 1234–1258 (2d ed. 1956).
• Thomas F. Bergin & Paul G. Haskell, Preface to Estates in Land and Future Interests 38–75 (2d ed. 1984).
• Roger A. Cunningham, William B. Stoebuck & Dale A. Whitman, The Law of Property §§ 2.4–2.7 (3d ed. 2000).
• Frederick Pollock & Frederic W. Maitland, The History of English Law Before the Time of Edward I, vol. 2, at 12–29 (2d ed. 1898).
• S. F. C. Milsom, Historical Foundations of the Common Law 178–210 (2d ed. 1981).
• A. W. B. Simpson, A History of the Land Law 88–102, 208–241 (2d ed. 1986).
• Sir John Baker, An Introduction to English Legal History 291–319 (5th ed. 2019).
• Susan F. French, Toward a Modern Law of Servitudes: Reweaving the Ancient Strands, 55 S. Cal. L. Rev. 1261 (1982).
• Restatement (First) of Property §§ 16, 23–24, 44–46, 154–158, 561 (1936).
• Restatement (Third) of Property (Servitudes) §§ 1.6, 3.1, 8.5 (2000).
• Restatement (Third) of Property (Wills and Other Donative Transfers) §§ 25.1–25.5 (1999).
• U.S. Const. amends. V, XIV.
• Statute De Donis Conditionalibus, 13 Edw. 1, c. 1 (1285).
• Statute Quia Emptores, 18 Edw. 1, c. 1 (1290).
• Statute of Uses, 27 Hen. 8, c. 10 (1536).
• Statute of Wills, 32 Hen. 8, c. 1 (1540).
• Statute of Frauds, 29 Car. 2, c. 3 (1677).