As the lessee may assign or sublet unless forbidden, so may the lessor part with his interest in the leased premises. When an assignment of it is made, the assignee may sue in his own name for rent accruing after the assignment.

The lease of a private residence is not a warranty that it is reasonably fit for occupancy. Thus saith the law. Nor can a lessee, unless the lessor has misrepresented the healthfulness of the place, leave after the unwelcome discovery that it is not healthful. This seems to be rather harsh, but the rule is founded on the presumption that the lessee will examine the house before leasing and make proper inquiries about its healthfulness.

By the common law the lessor was not required to make repairs. This has been changed in some states by statute. He is not required to make repairs needed and known to the tenant at the time of making his lease. Hallways, staircases, elevators, and the like that are used in common by the tenants of a building and are under the landlord's control, must be kept in repair by him. If he shall let a many storied building to several tenants, to each tenant a story, who have exclusive possession thereof, the lessor will not be liable to any lessee for the damage caused by another.

If the landlord agrees to make repairs and keep the tenement in good condition, he is required to keep it in essentially the same condition as it was when the tenant took possession. Should the house or other building be destroyed by fire what then? An agreement to keep it in good repair imposes an obligation on the landlord's part to rebuild. But an agreement by the lessee to keep and leave it in good repair, does not require him to rebuild should it be destroyed by fire, or other cause without any fault of his own. If the lease provides that the insurance money, when the landlord has insured the premises, shall be applied to rebuild in the event of fire, he must regard his agreement, but if there be no such agreement, the tenant cannot compel his landlord to thus apply it. Should the lessor fail to fulfill his agreement to repair, the tenant is not excused from paying his rent, nor justified in leaving the premises. His remedy is to sue his landlord for the damages or injury to himself. And even if the premises be destroyed by fire the tenant must continue to pay his rent unless he has been wise enough to relieve himself by a proper clause, or unless some kindly statute has been passed relieving him on the happening of such an event. No oral stipulation, that the parties should make covering the effect of loss by fire or other contingency, would be binding if contrary to the terms of the written lease. As this is the highest form of the agreement, all verbal stipulations to the contrary must give way.

A tenant can make no permanent alteration without his landlord's consent; and should he do so and injure the premises the landlord may recover damages, or, if such an alteration is feared or threatened, he may prevent it by obtaining an injunction from a court ordering the tenant not to make it and penalizing him should the order be disobeyed.

When a lease is renewed, the new lease may be regarded in two different ways. It may be considered as the continuation of the lease, and thereby protecting all the interests created under it. And this will be the case whenever the old lease clearly shows that if a renewal should be made this was the intention of the parties. When nothing is said, a renewed lease is a surrender of the old one and different conditions may arise. It is important therefore when providing for the renewal of a lease to specify what the parties intend, whether a renewal or continuation on the old terms, or a renewal on other terms to be fixed at another time.

Usually a lease specifies not only the amount of rent to be paid, but the time of payment. If silent, yearly rent is not due until the end of the year, quarterly rent at the end of the quarter, monthly rent at the end of the month. When a lessee is evicted or turned out of possession by his landlord, he is excused from paying rent. What, therefore, is an eviction? Any act by the landlord, or by his agent, impairing the worth of the premises to the tenant, for example, the destruction of a summer house, turning rooting pigs into the premises, the erection of a new building rendering the leased premises unfit for occupation. One of the curious cases is the lease of a distillery which could not be run because the landlord prevented the lessee from getting a license. In like manner if the landlord is to furnish heat and fails to do so, the tenant is justified in leaving. More generally, any act by the landlord whereby the leased premises are rendered unfit or impossible for the purpose intended, and affecting the health and comfort of the tenant, is an eviction.

The eviction must be done by the lessor. An act done by a wrongdoer, not under the lessor's order, will not justify the lessee in quitting. Thus the darkening by an adjacent owner of the lessee's premises by erecting a structure, however injurious it might be, would not justify the lessee in quitting and refusing to pay his agreed rent. This is one of the risks taken when making the lease.

Suppose a person occupying state land is evicted by the state, must he continue to pay rent? In Missouri the rent ceases, or if evicted of a part, he must pay rent on the remainder. In some states he must still continue to pay his rent and then demand compensation for his loss.

Sometimes land is rented on shares, a very common way in the olden time. When this is done, the relation of landlord and tenant may be created, or perhaps a partnership relation. If the farmer is to do the work of a servant of the owner of the farm, receiving in return therefor, a specified part of the crops, the agreement is one of hiring and not a lease. If the farmer has rightful possession of the use of the land, then the payment of his rent in produce does not affect his relation as a tenant. The natural increase of stock leased with a farm belongs to the tenant, and a landlord cannot recover for the death of cattle in the tenant's possession, unless he can prove his tenant's negligence. And if a lessee should sell part of the stock contrary to the lease, the purchaser would be liable therefor.