What conditions does the property need to be an intermediary by itself?

Illegal! If you want to be a broker in an intermediary company, as the two upstairs said, it is ok to have a mouth, but whether you can make money depends on how you play. To put it bluntly, it is to sell.

If you want to start your own intermediary company, you must first have a business license, and you must have a senior broker license under the company name (hanging your name is ok). The other is housing and customers. Generally speaking, the threshold is low. But if you are the champion, you will lose money. Business is up to you.