How to write the agreement on purchasing demolition and resettlement houses?

Purchase Agreement for Demolition House Party A (Seller): IDNo.: Party B (Buyer): IDNo.: After friendly negotiation, the following agreement is reached on the purchase of house: 1. Party A voluntarily sells the house to Party B, namely, Room _ _ _ _ _ 2. Party A agrees to sell the allocated house to Party B, that is, the price is _ _ _ _ _ _ _ _. Three. Payment method: the house price is RMB * * * only. When handling the real estate license in _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5. The house is located in _ _ _ _ residential area. After Party A sells it to Party B, Party A has no right to interfere in finance or collect fees. After Party A's real estate license is completed, Party A must actively cooperate with Party B to transfer Party A's real estate license and other documents to another party. Party A shall not charge Party B any fees. Intransitive verb The unified real estate license of the house in _ _ _ _ _ district has been completed, and Party A directly transfers the real estate license and land certificate to Party B. However, the fees and transfer taxes for handling the real estate license and land certificate shall be borne by Party B, and Party A shall not bear any expenses. VII. Party A has no right to take back the house from Party B before the collective unified real estate license and land certificate of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Agreement * * * Both parties agree not to violate any agreement. If one party breaches the contract, it shall pay the promisor a penalty of RMB 80,000.00 Yuan only. (If one party breaches the contract, it shall pay the other party a penalty of RMB 80,000 only). X. Since the date of signing this contract, Party A will hand over the key to Party B, which means that this contract will come into effect. XI。 This contract is made in duplicate, which shall come into effect after being signed by both parties, and each party holds one copy for proof. Party a (signature): party b (signature): MM DD YY.