Are you asking if someone at the ODP would pay some other site, for that other site to link to some ODP category page? You'd have to contact the AOL advertising hirelings for that; but I'd bet they would not be interested.
If a site wants to link to an ODP category without outside sponsorship, they can just browse to the category page at dmoz.org, copy the link out of their browser window, and use that as the link URL. Nobody at the ODP or AOL will say yea or nay: it is a free internet, and you can link wherever you want from your site. (Well, your local police may restrict you, but we won't.)
Since the real estate business is so intrinsically local, ODP real estate listings are nearly all in locality categories -- there really isn't an ODP page that links to all pages containing only real estate listings. (And in localities too small to HAVE a separate real estate category, the real estate listings are just mingled in with the other local businesses.) So what you are looking for may not even exist.
Feel free to rephrase your question if I've completely missed all of its gist.