1. Commercial use naturally includes catering. As for the approval of the departments of health, environment and fire protection needed for catering, that's later.

2. Whether the landlord is reasonable depends on whether the lease contract between you and the landlord stipulates that you can sublet. According to the current legal provisions, subletting without subletting is subject to the consent of the landlord, or the landlord has not raised any objection for a period of time after subletting.

3. If the landlord refuses to sublease as stipulated in the lease contract, it will be regarded as a breach of contract.