Is it permissible to rent agricultural land from its tenant without the original owner's knowledge, especially since there is an agreement with the tenant regarding the type of crops, and the terms of the original contract are unknown?

It is permissible for the tenant to lease the rented property during the contract period, and to someone who will benefit from it in a manner similar to their own use or with less harm, unless the landlord stipulates that the tenant must utilize the property himself. And the tenant's sub-lease is permissible for the same rent, more, or less. However, it is not permissible for the tenant to lease it to someone who would cause more harm than himself, or to someone whose harm differs from his own. If these conditions are met, then there is no harm in renting the land from its tenant, and there is no need to refer to the original owner. The sin falls upon the original tenant if there was a violation.