(1) Theoretically speaking:
First of all, according to the landlord, "I signed a contract with Zhang, and generally rented the house to Zhang for three years, starting from June 1 day, 2009", so you have acquiesced in Liu's sublease contract, which has been established although it has not taken effect. Article 224 of the Contract Law does not apply. With the consent of the lessor, the lessee may sublet the leased property to a third party. If the lessee sublets, the lease contract between the lessee and the lessor shall remain valid, and if a third party causes losses to the leased property, the lessee shall compensate for the losses.
If the lessee sublets without the consent of the lessor, the lessor may terminate the contract.
Secondly, if Zhang has the following circumstances, he can terminate the contract. Article 227 Contract Law Where the lessee fails to pay or delays in paying the rent without justifiable reasons, the lessor may require the lessee to pay within a reasonable period of time. If the lessee fails to pay within the time limit, the lessor may terminate the contract.
Third, June 2009 is the effective time of the contract. Article 229 During the lease term, if the ownership of the lease item changes, the validity of the lease contract shall not be affected. The so-called "business does not break the contract." Therefore, even if the house is sold, the lease contract cannot be terminated before it expires. The landlord can negotiate with the buyer when selling the house, and the rent belongs to the buyer.
I don't understand why the landlord asked him to move out. You are the owner of the house, so it's up to you to sell it. Although buying and selling does not break the lease, on the other hand, leasing does not affect buying and selling. Article 230 Where the lessor sells the leased house, it shall notify the lessee within a reasonable period before the sale, and the lessee shall enjoy the preemptive right under the same conditions. So you can sell the house. If Zhang doesn't agree, you can let Zhang buy your house at the same price.
(2) According to the situation of the landlord, you can:
1, please consult with Zhang first. It's best not to go to court. It is time-consuming and laborious to explain the lawsuit to him.
I don't know how to sign your contract You'd better consult a local lawyer with the contract. In general, you can always find writing loopholes in the contract. Hold on!
Especially in terms of rent and lease term, a breakthrough must be made. If you don't agree on the specific amount (remember: it must be agreed in writing), it will be very beneficial to you!
The house is yours! You can take appropriate extreme measures!