1. Unified housing belongs to the housing allocated by the government, and it takes five years to get the real estate license. If the seller regrets it, it may lose both sides.
2. From the legal point of view, the real estate license is the basis to prove the ownership of the house. Only the purchase agreement has no legal benefit, and there may be a situation of one room and two sales.
3. If you encounter demolition before the transfer, you may not be able to make corresponding compensation.