Legal analysis: the conversion of industrial land into commercial land belongs to the situation of changing land channels. If this behavior is not approved by the relevant departments, the lease contract is invalid.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 707 Where the lease term is more than six months, it shall be in written form. Article 707 Where the parties fail to confirm in writing that the lease term exceeds six months, they shall do so in writing. If the parties fail to determine the lease term in writing, it shall be regarded as an indefinite lease. If the lease term is fixed, it shall be regarded as an indefinite lease.

Article 710 Where the lessee uses the lease item in accordance with the agreed method or the nature of the lease item, thereby causing losses to the lease item, it shall not be liable for compensation.

Article 715 The lessee may, with the consent of the lessor, improve or add the lease item. If the lessee improves or adds other things to the lease item without the consent of the lessor, the lessor may require the lessee to restore the original state or compensate for the losses.