Is the second-hand house contract invalid when the property is transferred and delivered?

The property transferred and delivered by the second-hand house contract will not be invalid. After the second-hand housing contract is transferred and delivered, the property will not be invalid, mainly because the object of property service is housing, not people. Even if the ownership of the house changes, it is still necessary to provide property services. When the second-hand house is delivered, both parties will negotiate who will pay the future property fee. If the new owner is willing to continue to use the original property service, then the original property service agreement needs to be transferred and updated.