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A concurrent estate or co-tenancy is a concept in property law which describes the various ways in which property is owned by more than one person at a time. If more than one person own the same property, they are referred to as co-owners, co-tenants or joint tenants. Most common law jurisdictions recognize tenancies in common and joint tenancies, and some also recognize tenancies by the entirety. Many jurisdictions refer to a joint tenancy as a joint tenancy with right of survivorship, and a few U.S. States treat the phrase joint tenancy as synonymous with a tenancy in common.
The type of ownership determines the rights of the parties to sell their interest in the property to others, to will the property to their devisees, or to sever their joint ownership of the property. Just as each of these affords a different set of rights and responsibilities to the co-owners of property, each requires a different set of conditions in order to exist.
Law can vary from place to place, and the following general discussion will not be applicable in its entirety to all jurisdictions.
 Rights and duties of co-owners (general)
Under the common law, Co-owners share a number of rights by default:
- Each owner has an unrestricted right of access to the property. When one co-owner wrongfully excludes another from using the shared property, the excluded co-owner can bring a cause of action for ouster. As a remedy, the court may grant the wronged co-owner the fair rental value of the property for the time that they were ousted.
- Each owner has a right to an accounting of profits made from the property. If the property generates any income (e.g. rent, farming, etc. . . .) each owner is entitled to a pro-rata share of that income.
- Each owner has a right of contribution for the costs of owning the property. Co-owners can be forced to contribute to the payment of expenses such as property taxes, mortgages for the entire property.
 Contribution and improvements
Co-owners generally do not have any obligation to contribute to any costs of repairing or improving the property. If one co-owner adds a feature that enhances the value of the property, that co-owner has no right to demand that any others share the cost of adding that feature - even if other co-owners reap greater profits from the property because of it. However, at partition, a co-owner is entitled to recover the value added by his or her improvements of the property if the "improvements" resulted in an increase in property value. Conversely, if the co-owner's "improvements" decrease the value of the property, the co-owner is responsible for the decrease. In an Australian case, the High Court said that the costs of repairing by one co-owner must be taken into account on the partition or final distribution (i.e. sale) of the property.
Furthermore, each co-owner can independently encumber the co-owner's own share in the property by taking out a mortgage on that share (although this may effectively convert a joint tenancy to a tenancy in common, as described below); other co-owners have no obligation to help pay a mortgage that only runs to another owner's share of the property, and the mortgagee can only foreclose on that mortgagor's share. Bank loans secured by mortgages on individual shares of co-owned property are one of the most rapidly expanding areas in the mortgage lending industry.
Finally, co-owners owe one another a duty of fair dealing. Because of this, any co-owner who acquires a mortgage claim against the property must give his co-owners a reasonable opportunity to purchase proportionate shares in that claim.
 Tenancy in common
Tenancy in common is the default form of concurrent estate[where?], in which each owner, referred to as a tenant in common, is regarded by the law as owning separate and distinct shares of the same property. By default, all co-owners own equal shares, but their interests may differ in size.
This form of ownership is most common where the co-owners are not married or have contributed different amounts to the purchase of the property. The assets of a joint commercial partnership might be held as a tenancy in common.
Tenants in common have no right of survivorship, meaning that if one tenant in common dies, that tenant's interest in the property will be part of his or her estate and pass by inheritance to that owner's devisees or heirs, either by will, or by intestate succession. Also, as each tenant in common has an interest in the property, they may, in the absence of any restriction agreed to between all the tenants in common, sell or otherwise deal with the interest in the property (e.g. mortgage it) during their lifetime, like any other property interest.
 Destruction of tenancy in common
Where any party to a tenancy in common wishes to terminate (usually termed "destroy") the joint interest, he or she may obtain a partition of the property. This is a division of the land into distinctly owned lots, if such division is legally permitted under zoning and other local land use restrictions. Where such division is not permitted, a forced sale of the property is the only alternative, followed by a division of the proceeds.
If the parties are unable to agree to a partition, any or all of them may seek the ruling of a court to determine how the land should be divided - physically division between the joint owners (partition in kind), leaving each with ownership of a portion of the property representing their share. Courts may also order a partition by sale in which the property is sold and the proceeds are distributed to the owners. Where local law does not permit physical division, the court must order a partition by sale.
Each co-owner is entitled to partition as a matter of right, meaning that the court will order a partition at the request of any of the co-owners. The only exception to this general rule is where the co-owners have agreed, either expressly or impliedly, to waive the right of partition. The right may be waived either permanently, for a specific period of time, or under certain conditions. The court, however, will likely not enforce this waiver because it is a restraint on the alienability of property.
 Joint tenancy
A joint tenancy or joint tenancy with right of survivorship (JTROS or JTWROS) is a type of concurrent estate in which co-owners have a right of survivorship, meaning that if one owner dies, that owner's interest in the property will pass to the surviving owner or owners by operation of law, and avoiding probate. The deceased owner's interest in the property simply evaporates and cannot be inherited by his or her heirs. Under this type of ownership, the last owner living owns all the property, and on his or her death the property will form part of their estate. Unlike a tenancy in common, where co-owners may have unequal interests in a property, joint co-owners have an equal share in the property.
It is important to note, however, that creditors' claims against the deceased owner's estate may, under certain circumstances, be satisfied by the portion of ownership previously owned by the deceased, but now owned by the survivor or survivors. In other words, the deceased's liabilities can sometimes remain attached to the property.
This form of ownership is common between husband and wife, and parent and child, and in any other situation where parties want ownership to pass immediately and automatically to the survivor. For bank and brokerage accounts held in this fashion, the acronym JTWROS is commonly appended to the account name as evidence of the owners' intent.
To create a joint tenancy, clear language indicating that intent must be used - e.g. "to AB and CD as joint tenants with right of survivorship, and not as tenants in common". This long form of wording may be especially appropriate in those jurisdictions which use the phrase "joint tenancy" as synonymous with a tenancy in common. Shorter forms such as "to AB and CD as joint tenants" or "to AB and CD jointly" can be used in most jurisdictions. Words to that effect may be used by the parties in the deed of conveyance or other instrument of transfer of title, or by a testator in a will, or in an inter vivos trust deed.
If a testator leaves property in a will to several beneficiaries "jointly" and one or more of those named beneficiaries dies before the will takes effect, then the survivors of those named beneficiaries will inherit the whole property on a joint tenancy basis. But if these named beneficiaries had been bequeathed the property on a tenancy in common basis, but died before the will took effect, then those beneficiaries' heirs would in turn inherit their share immediately (the named beneficiary being deceased).
Nevada Probate Case Example: General partners held partnership property as "joint tenants." Upon dissolution, the survivIng partner took the property for his own use and refused to account for his deceased partner's interest. The probate court summarily rejected a challenge to that action, ruling that the surviving partner enjoyed full rights of survivorship regardless of who paid for the property, the terms of the partnership agreement, or the deceased partner's last will and testament. The Matter of The Estate of Fae Blackett Rider, Case No. P062231 (Clark County).
 Four unities of a joint tenancy
To create a joint tenancy, the co-owners must share "four unities":
- Time - the co-owners must acquire the property at the same time.
- Title - the co-owners must have the same title to the property. If a condition applies to one owner and not another, there is no unity of title.
- Interest - each co-owner owns an equal share of the property; for example, if three co-owners are on the deed, then each co-owner owns a one-third interest in the property regardless of the amount each co-owner contributed to the purchase price
- Possession - the co-owners must have an equal right to possess the whole property
If any of these elements is missing, the joint tenancy is ineffective, and the joint tenancy will be treated as a tenancy in common in equal shares.
 Breaking a joint tenancy
If any joint co-owner deals in any way with a property inconsistent with a joint tenancy, that co-owner will be treated as having terminated (sometimes called "breaking") the joint tenancy. The remaining co-owners maintain joint ownership of the remaining interest. The dealing may be a conveyance or sale of the co-owner's share in the property. The position in relation to a mortgage is more doubtful (see below). For example, if one of three joint co-owners conveys his or her share in the property to a third party, the third party owns a 1/3 share on a tenancy in common basis, while the other two original joint co-owners continue to hold the remaining 2/3s on a joint tenancy basis. This result arises because the "unity of time" is broken: that is, because on the transfer the timing of the new interest is different from the original one. If it is desired to continue to maintain a joint tenancy, then the three original joint co-owners would need to transfer, in the one instrument, the joint interest to the two remaining joint co-owners and the new joint co-owner.
A joint co-owner may break a joint tenancy and maintain an interest in the property. Most jurisdictions permit a joint owner to break a joint tenancy by the execution of a document to that effect. In those jurisdiction which retain the old common law requirements, an actual exchange with a straw man is required. This requires another person to "buy" the property from the joint co-owner for some nominal consideration, followed immediately by a sale-back to the co-owner at the same price. In either case, the joint tenancy will revert to a tenancy in common as to that owner's interest in the property.
There is a big problem that is possible with the simple document execution method. In the straw man approach, there are witnesses to the transfer. With the document, there may not be witnesses. With either method, as soon as the break occurs, it works both ways. Because there may not be witnesses, the party with the document could take advantage of that fact and hide the document when the other party dies.
 Mortgages to break joint tenancy
If one joint co-owner takes out a mortgage on jointly owned property, in some jurisdictions this may terminate the joint tenancy. Jurisdictions which use a title theory in this situation treat a mortgage as an actual conveyance of title until the mortgage is repaid, if not permanently. In such jurisdictions, the taking of a mortgage by one owner terminates the joint tenancy as to that co-owner. There are exceptions, and the law in the State of Georgia is a notable exception.
In Georgia, joint tenancy is commonly conveyed in a deed as "Joint Tenants with Rights of Survivorship". The legal effect of this type of tenancy is a "life estate" with a "contingent remainder". Translated, this means that the interest of each joint tenant can be thought of in two parts: the "present" interest while the parties are both alive and what happens in the "future" when one of the tenants dies. Viewed separately, the interest of each independent co-tenant is only "temporary" interest while they both co-tenants are alive and neither owns a "full" interest. The "full" interest is determined by who outlives the other and vests automatically in the survivor at, and only at, the time of death. In the case of a mortgage executed by only one of the living joint tenants, the mortgage does not sever the tenancy. Instead, the mortgage is interpreted as conveying whatever interest the debtor holds. In this example, that would be the debtor's life (or "temporary") estate only, since both parties are still living, but the lender would also be entitled to the full estate, but only if the debtor were to outlive the other joint-tenant. Consequently, if the debtor dies first, the co-tenant, who is not party to the mortgage, would take full ownership interest of the property free and clear of the mortgage. In sum, under Georgia law, execution of a mortgage (called a "Deed to Secure Debt" or "Security Deed") by one co-tenant does not sever the joint tenancy.
However, in jurisdictions which use the lien theory, the mortgage merely places a lien on the property, leaving the joint tenancy undisturbed. As a lien is not enough to terminate a joint tenancy, if the debtor dies before the creditor sues, the creditor is left with no claim against the property, as the debtor's interest in the property evaporates and automatically vests in the other surviving co-owners.
 Petition to partition to sever a joint tenancy
A co-owner of a joint tenancy with rights of survivorship deed may sever the joint tenancy by filing a petition to partition. A petition to partition is a legal right, so usually there is no way to stop such an action. When a court grants a partition action for a joint tenants with rights of survivorship deed, the property is either physically broken into parts and each owner is given a part of equal value OR the property is sold and the proceeds are distributed equally between the co-owners regardless of contribution to purchase price. No credits would be issued to any tenant who may have made a superior contribution toward purchase price.
Some states allow a co-owner the option of buying out the other co-owners to avoid a public sale of the property. Some states also allow multiple co-owners to join their shares together to claim a majority ownership to avoid public sale of the property and to have the property awarded to the majority owners. If the property is sold publicly, the usual method is a public auction.
During a partition process, credits may be granted to co-tenants who have paid property expenses in excess of their share, such as utilities and property maintenance. Credit may be given for improvements done to the property if the improvements have increased the value of the property. No credit would be given for excess contribution to purchase price, as joint tenancy with rights of survivorship deeds are taken in equal shares as a matter of law.
Pennsylvania partition case example: In D’Arcy v. Buckley, 71 Bucks Co. L. Rep. 167 (August 21, 1998), two persons purchased property as joint tenants with right of survivorship. The Plaintiff contributed five times more than the Defendant toward the purchase price. In a partition action, the Plaintiff sought credit for the full amount of his superior contributions. The Court held that, in the absence of fraud, the working of the deed operated to convey a one-half interest to each of the two joint tenants. The decision relies the authorities of Masgai v. Masgai, 460 Pa. 453, 333 A.2d 861 (1975) and DeLoatch v. Murphy, 369 Pa. Super. 255, 535 A.2d 146 (1987). The Plaintiff argued, to no avail, that he did not intend to make a lifetime gift to defendant.
 Tenancy by the entirety
A tenancy by the entirety (sometimes called a tenancy by the entireties) is a type of concurrent estate formerly available only to married couples, where ownership of property is treated as though the couple were a single legal person. (In the State of Hawaii, the option of Tenants by the Entirety ownership is also available to domestic partners in a registered "Reciprocal Beneficiary Relationship"; Vermont's Civil Union statute qualifies parties to a civil union for tenancy by the entirety). Like a JTWROS, the tenancy by the entirety also encompasses a right of survivorship, so if one spouse dies, the entire interest in the property passes to the surviving spouse, without going through probate.
In some jurisdictions, to create a tenancy by the entirety the parties must specify in the deed that the property is being conveyed to the couple "as tenants by the entirety," while in others, a conveyance to a married couple is presumed to create a tenancy by the entirety unless the deed specifies otherwise. Also, besides sharing the four unities necessary to create a joint tenancy with right of survivorship - time, title, interest, and possession - there must also be the fifth unity of marriage. However, unlike a JTWROS, neither party in a tenancy by the entirety has a unilateral right to sever the tenancy. The termination of the tenancy or any dealing with any part of the property requires the consent of both spouses. A divorce breaks the unity of marriage, leaving the default tenancy, which may be a tenancy in common in equal shares. Many US jurisdictions no longer recognize tenancies by the entirety. Where it is recognized, benefits can include the ability to shield the property from creditors of only one spouse, as well as the ability to partially shield the property where only one spouse is filing a petition for bankruptcy relief. If a non-debtor spouse in a tenancy by the entirety survives a debtor spouse, the lien can never be enforced against the property. On the other hand, if a debtor spouse survives a non-debtor spouse, the lien may be enforced against the whole property, not merely the debtor spouse's original half-interest.
Kurtz, Hovenkamp. Cases and Materials on American Property Law, Fifth Edition. Chapter 5: Concurrent Estates.
Note that every country and every state in the United States has at least minor variations on the law as applied to joint ownership of property. These links generally discuss the law as applied in the state from which they originate:
IRS Revenue Procedure 2002-20, which covers the finer details controlling what constitutes a Tenant in Common for federal tax purposes.
Tenant in Common Association
Comprehensive Tenancy in Common Resource Database
Detailed Info on San Francisco Tenancy in Common Rules
Tenancy By the Entirety in Massachusetts.
For a good discussion on this misunderstood estate see Coraccio v. Lowell Five Cents Savings Bank, 415 Mass. 145, 612 N.E. 2d 650.
There is nothing in the laws of Massachusetts, or New York as stated in Coraccio, to prevent one tenant by the entirety from conveying her own or his own interest in the property, subject to the continuing rights of the other. While it is generally believed that one tenant by the entirety cannot convey their interest because the tenancy cannot be severed, rather it is the survivorship rights of the other that cannot be severed. Thus, if a husband conveyed his interest in the property held as tenants by the entirety to his brother, the husband no longer owns an interest in the property. The brother takes his (the husband's) place within the tenancy. Here is the tricky part: if the wife dies then the husband's brother acquires all interest in the real estate. If the husband dies before the wife then it all goes to her free and clear and the husband's brother has nothing. Some conveyancers have treated deeds by one tenant by the entirety as null. However, such a deed conveys the interest of the grantor in the property subject to the survivorship rights of the other co-tenant.
Tenancy By the Entirety at Common Law/effect of a conveyance by one: