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The four unities is a concept in the common law of real property describing conditions that must exist in order for certain kinds of property interests to be created. Specifically, these four unities must be met in order for two or more people to own property as joint tenants with right of survivorship, or for a married couple to own property as tenants by the entirety. Some jurisdictions may require additional unities. == The four unities == ; Unity of time : Interest must be acquired by both tenants at the same time. ::In common law, the "time" requirement could be satisfied only by using a "straw man" to create a joint tenancy. The party creating the joint tenancy would have to convey title to a straw man, who would then transfer title to the two parties as joint tenants. ; Unity of title : The interests held by the co-owners must arise out of the same instrument.〔''Re Murdoch and Barry'' (1976), 10 O.R. (2d) 626 (H.C.J.).〕 ; Unity of interest : Both tenants must have the same interest in the property. ::This means that the joint tenants must have the same type of interest, and the interest must run for the same duration. For example, if X and Y create a joint tenancy, both X and Y's interests must be in fee simple absolute. If, for example, X has a fee simple absolute and Y has a life estate, there is no unity of interest. ; Unity of possession : Both tenants must have the right to possess the whole property. If any of the four unities is broken and it is not a joint tenancy, the ownership reverts to a tenancy in common. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Four unities」の詳細全文を読む スポンサード リンク
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