After you have defined that the listing is for Real Estate on the [Content > Type] tab, you will have one more option called Real Estate where you can enter a title, a description and other important information for this business:

The blue area of the registration is information that will also be used for the Long Term Rental module, in case you also advertise the product for this line of business.
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Now that you know where to set up the specific content information for Real Estate, it is time to see how to register the negotiation amounts for this segment!