The process of transferring real estate to heirs largely depends on the form of ownership in which the property is registered.
Your heirs will become the full owners of the property after the administrator receives a court decision on the inheritance case.
The death of a tenant does not entail the transfer of his rights and obligations to his heirs. The Thai court will not hear such a case in probate proceedings (by law it is an object of contract law, not an asset or property).
What to do? When purchasing a property on leasehold, it is mandatory to include in the contract a clause regarding the procedure for obtaining such a right (long-term lease) by your heirs.
If a foreigner owns a share in the authorized capital of a Thai company on which real estate is registered, then in a will in Thailand it is necessary to indicate exactly this share in the company, and not the property.
The procedure for preparing documents has a lot of subtleties - therefore, it is advisable to worry about the issue of inheritance in advance.