Unlike a rental agreement subject to normal rent laws, this type of special rental agreement is not established by the Civil and Commercial Code, but established by the Supreme Court of Thailand. In certain situations where the lessee has made an agreed substantial investment in the improvement of the leased object, which benefits the owner at the expiry of the contract, the lease agreement may be considered a particular reciprocal contract. If there is a mutual agreement between the parties on the lessee`s investment and the benefit to the owner at the end of the term of the contract, the lease agreement could be considered a particular mutual contract and (based on Supreme Court rulings), another set of rules would apply to the contract (beyond the leasing of real estate laws). Tenant`s right of subletting, if agreed), contrary to contractual promises (e.g. B rent renewal option) that can be imposed on a particular person or person – under Thai rental law, the line between real estate rights (rental rights) and personal contract promises in a rental agreement is not always easy. Therefore, Thai law only allows the right to sublet or assign a housing rental agreement: if the lease contains the tenant`s right to transfer his rental rights or to transfer ownership of the rented property to a third party (Article 544, paragraph 544 (Civil and Commercial Code): “Unless otherwise provided in the rental agreement, a tenant cannot assert his rights over all or part of the rented property to a third party subletting or transfer. . . .