The house bought by mainlanders in other places is not a local hukou. Can I buy social security with a real estate license?

No, because ordinary foreign accounts can't pay social security locally in their own names. You can join a local company and pay social security in the name of the company; If you are a freelancer and don't join the company, you can find a social security payment company, China Travel. Ask them to help you pay social security. If you have a job there, you can ask your company to pay social security for you. This is stipulated by the policy. The unit must purchase social security for its employees. If the company doesn't handle social security for you, you can report or complain to them. If you need to change your work place later, then you need to transfer the social security together, just go to the place where you pay the social security now and go through a social security transfer procedure, directly transfer to your current work place or directly transfer back to your household registration.