What should I do if I buy a house fifteen years ago and the seller goes back on his word?

Registration of real estate ownership against a third party. In this case, the subject house has not gone through the transfer formalities, so for the third party, the owner is still Lao Zhou. But the relationship between Lao Zhou and Lao Zhao is the relativity of contract. Although the house has not been transferred, Lao Zhao has paid the house price as agreed, and actually occupied the target house 15 years. Lao Zhou may, according to the contract signed by both parties, ask Lao Zhao to cooperate with the transfer of house property rights; Of course, if both parties have an agreement on the transfer of housing property rights in the contract, they can also apply to the people's court for confirmation of housing ownership according to the contract. The specific scheme needs to be determined according to the contents of the contract. It is recommended to hire a professional lawyer to help solve the problem. Supplement: 1 If Lao Zhou doesn't cooperate, Lao Zhou can make up the difference between today's house and the original house, and then the house will be returned to Lao Zhou. Of course, there is still depreciation. When the ownership of real estate changes, the registration confrontation means that the ownership of the house is still 35 years. Check whether the clockwork is too long at night within a predetermined period?