How to find out how many properties a person owns in Dongguan?

Want to know how many houses a person has under the name of Dongguan, can only be found on the local housing management department's regional network. Search the websites of local provincial and municipal real estate administrations for inquiries, enter the name of the property owner and the number of the real estate license, and inquire about the real estate under the personal name. But what is even more inconvenient is that at present, not all the websites of real estate administrations in all regions can be found.