You may not be in the penalty box for the spam links. I have had sites that were hacked and spam links inserted just like yours and Google did not drop the positions in the serps. They put up a notice warning that if anyone clicked on the link they risked going to a site that contained malware. When I cleaned up the hacked pages the notice would disappear in a couple of days.
Right now many real estate sites have disappeared from Google's serps. They are undergoing some major changes right now and sites have disappeared for no reason - yours is probably one of them.
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