We arrive at the final Mishnah in chapter eight, which concludes the topic of renting residences and the laws of landlords and tenants. The Mishnah begins: "Hamaskir bayis lachaveiro, venafal" - A person rented a house to his fellow, and during the rental period the house collapsed, whether from a lightning strike or an earthquake, and it is no longer fit for living. The Mishnah states: "Chayav leha'amid lo bayis" - The landlord is obligated to provide another house for the tenant to live in.
The basis of the obligation - a commitment to provide a place to live:
The idea underlying this law is that the tenant approached the landlord and said: "I need a place to live, and I know you own many houses - I would like one of them". This is similar to a person who arrives at an inn and asks for a room for the night, without specifying a particular room. Since the landlord committed to providing a place to live, he has no choice but to rebuild the house, and he cannot wash his hands of it and say: "This is not my problem, but rather your problem".
When a specific house was agreed upon:
However, when the parties agreed upon a specific house - which is how almost all rentals are conducted nowadays - the law is different. We cannot force the landlord to rebuild, because his commitment was to rent out this specific house, not to provide a person with a place to live in general. Therefore, the landlord can say: "Your house is right here before you, and you must deal with it; I do not agree to rebuild it".
Rashi explains this in a far-reaching manner, saying that the landlord can tell the tenant: "You asked for this house, and you received this house. The lightning that struck it - that is your luck and your fate, and you must deal with it rather than blaming me". According to this approach, the landlord is not even obligated to refund the rent, and he may continue to collect it for the rest of the year, or keep the payment that was paid in advance for that period.
However, almost all the Rishonim disagree with this, and this is not the ruling of the Rema and the poskim. The halachah is as follows: Although the landlord cannot be forced to rebuild the specific house, since he never committed to doing so, he certainly must refund the rent that was paid in advance, or refrain from collecting it in the future, because he is no longer providing the ability to live there.
"I am renting you a house like this one":
The continuation of the Mishnah deals with a new case: a tenant who examined various options among the landlord's houses and said, "I want a house like this one" - meaning a house similar to the one he saw. In such a case, if the house falls, the replacement house provided to him must be exactly "like this one", similar to what was agreed upon. From here emerge the details of the law:
"Hayah katan lo ya'aseh gadol" - If the house he rented was small, the landlord cannot provide him with a large house, because it is possible that the tenant is not interested in maintaining a large house: the electricity expenses are significant, the cleaning costs are high, and there is also the evil eye of the neighbors to consider.
Hayah gadol - lo ya'aseh katan: If the house was large, the landlord cannot provide him with a smaller house, because the tenant can claim that he needs a more spacious area for his family members.
Regarding the number of rooms: If the house had one room, he may not provide him with a two-room house; if it had two rooms, he may not provide him with a one-room house.
Regarding the number of windows: If there were six windows in the house, their number may not be changed.
It is worth noting that in the times of the Mishnah, windows were not made of glass panes like in our days, but were openings in the structure designed to let in light. Naturally, the cold entered through them as well, and therefore there is a balance here: the advantage of having many windows versus their disadvantage. For this reason, one may not add to or subtract from the number of windows, nor may one change the number of rooms or make a significant change in the area of the house, unless both parties agreed to it.
Consequently, the landlord cannot force the tenant to accept another house that is not "like this one" - meaning, one that does not match what was agreed upon between them when making the original transaction.
In summary: In this lesson, we learned that a landlord who committed to providing a tenant with an unspecified residence is obligated to provide him with another house if the house collapses; whereas when a specific house was agreed upon, he cannot be compelled to rebuild it, but he must refund the rent (unlike the opinion of Rashi). We also noted that when the agreement was for "a house like this," the replacement house must match in its dimensions, its number of rooms, and its number of windows, unless both parties agreed to a change.