Plaintiff lessor (Defendant of counterclaim) and Defendant lessee (Plaintiff of counterclaim) concluded a lease contract for state-owned assets, which stipulated that: the lessee’s modification of the premises and facilities would require the lessor’s consent and recognition; if the lessee failed to pay rent for more than one month after the due date, the lessor could unilaterally terminate the contract by notifying the lessee in writing that the lessee would be liable to pay 30% of the annual rent as liquidated damages.