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Good discussion here. I want to add, I noticed that you had categorized your question in two of our Local SEO categories, so I'm guessing you might be specifically looking to hire a Local SEO. If that's true, I recommend that you check out the websites of some of the experts who participated in the Moz Local Ranking Factors 2014 Survey. You'll see them listed on the left side of the survey in the box titled 'Contributors'. There are some very good companies represented there: https://moz.com/local-search-ranking-factors If you specifically need Local SEO rather than traditional SEO, you'll want to be sure you're working with Local experts.

Obviously Dirk is right but again you will lose the opportunity to rank in search engines from the related key phrases and if you have played around with real estate industry before, you will have an idea about how difficult it is to rank and what are the advantages of ranking for that particular term. In my opinion, duplication on page works like when the page is 60 to 70% identical to another page on the website and this is exactly what is happening in your case. I do agree the fact that you cannot change the descriptions but you can actually add the section on the page that explain more about the property. A custom box where you can include your custom written content. I agree it’s a lot of work at your end but at the end of the day you will get a chance to rank well for those important key phrases that can offer you great amount of conversions. Just a thought!