A leasehold is an interest in real property that terminates on a certain date. The leasehold itself is personal property and has three major forms: (1) the estate for years, (2) the periodic tenancy, and (3) the tenancy at will. The estate for years has a definite beginning and end; it need not be measured in years. A periodic tenancy—sometimes known as an estate from year to year or month to month—is renewed automatically until either landlord or tenant notifies the other that it will end. A tenancy at will lasts only as long as both landlord and tenant desire. Oral leases are subject to the Statute of Frauds. In most states, leases to last longer than a year must be in writing, and the lease must identify the parties and the premises, specify the duration, state the rent, and be signed by the party to be charged.

The law imposes on the landlord certain duties toward the tenant and gives the tenant corresponding rights, including the right of possession, habitable condition, and noninterference with use. The right of possession is breached if a third party has paramount title at the time the tenant is due to take possession. In most states, a landlord is obligated to provide the tenant with habitable premises not only when the tenant moves in but also during the entire period of the lease. The landlord must also refrain from interfering with a tenant’s permissible use of the premises.

If the landlord breaches an obligation, the tenant has several remedies. He may terminate the lease, recover damages, or (in several states) use a rent-related remedy (by withholding rent, by applying it to remedy the defect, or by abatement).

The tenant has duties also. The tenant must pay the rent. If she abandons the property and fails to pay, most states do not require the landlord to mitigate damages, but several states are moving away from this general rule. The tenant may physically change the property to use it to her best advantage, but she may not make structural alterations or commit waste. The tenant must restore the property to its original condition when the lease ends. This rule does not include normal wear and tear.

Should the tenant breach any of her duties, the landlord may terminate the lease and seek damages. In the case of a holdover tenant, the landlord may elect to hold the tenant to another rental term.

The interest of either landlord or tenant may be transferred freely unless the tenancy is at will, the lease requires either party to perform significant personal services that would be substantially less likely to be performed, or the parties agree that the interest may not be transferred.

Despite the general rule that the tenant is responsible for injuries caused on the premises to outsiders, the landlord may have significant tort liability if (1) there are hidden dangers he knows about, (2) defects that existed at the time the lease was signed injure people off the premises, (3) the premises are rented for public purposes, (4) the landlord retains control of the premises, or (5) the landlord repairs the premises in a faulty manner.