If a rented second story is damaged, when may the upstairs tenant move in downstairs with the landlord? \u2022 How do the Rambam and Rosh differ in their respective approaches to an unresolved question between Landlord and Tenant? \u2022 Who is responsible for repairing a leak that runs from the upper floor and damages the lower floor? \u2022 Does the right to build a second story include rights to utilize the ground directly?