How to determine the validity of property contract?

The validity of the property contract can be identified from the following points: 1. According to the bidding management methods of property management in the early stage of the seven systems of property management, the projects undertaken by property companies must first be obtained through legal bidding procedures; 2. The preliminary realty service contract must be signed with the developer and filed with the housing management department and the price department at or above the county level; 3. The realty service contract must be signed with the owners' committee and filed with the housing management department and the price department at or above the county level; 4. The industrial and commercial license and enterprise qualification grade certificate of the property enterprise must be consistent with Party B in this contract; 5. The business plan of the property enterprise, the qualification certificate of the employees and the actual personnel must be consistent; 6, the property enterprise's government affairs open system must be open, and effectively accept the supervision of the owners.