How to determine whether a residential area is legal?

For units to raise funds to build houses, it is generally stipulated that they shall not be traded within 5 years. Five years later, there are no clear laws and regulations on how to go public. But the reality is that many employees sold their property five years later. Because the fund-raising house also has a title certificate, and there is a title certificate, there will be no problem in the transaction. The only remaining problem is that the owner unit may handle all property rights for the owner in the future, which may result in some expenses. You can make it clear in the contract that after the property is transferred, all the expenses that the seller needs to pay have nothing to do with the buyer.