Is it permissible for the landlord to annul the lease contract after the house has been built, knowing that the tenant stipulated this lease for entering into the partnership, and what if the annulment results in harm to the tenant?

It is permissible for two individuals to share in purchasing a piece of land and constructing floors on it, with each having their own floor. It is also possible to stipulate a lease contract within the partnership contract, provided it does not lead to a Shariah-prohibited matter such as usury (riba). It is permissible for one of them to lease their share to the other. If the lease is for a specified period, neither party can unilaterally annul it except with the consent of the other. However, if the lease is for an unspecified period, it is a void contract and must be annulled. If the agreement is merely a promise to lease, it is not binding unless it is held that fulfilling a promise is obligatory. But if it is an actual contract that meets the conditions, such as the apartment being described and the duration and rent being known, then it is permissible to lease something described in one's liability (dhimma) or for a period that does not immediately follow the contract.