Is it legal to sign the property fee in the purchase contract?

Legal. According to the provisions of Article 38 of the Contract Law of People's Republic of China (PRC), the contents of the contract are agreed by the parties, which does not violate the mandatory provisions of laws and administrative regulations, public interests, public order and good customs, and the parties can agree on the contents of the contract, so it is legal to sign the property fee in the house purchase contract.