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I have a real estate Wordpress site that uses an IDX provider to add real estate listings to my site. A new page is created as a new property comes to market and then the page is deleted when the property is sold. I like the functionality of the service but it creates a significant amount of 404's and I'm also concerned about duplicate content because anyone else using the same service here in Las Vegas will have 1000's of the exact same property pages that I do. Any thoughts on this and is there a way that I can have the search engines only index the core 20 pages of my site and ignore future property pages? Your advice is greatly appreciated. See link for example http://www.mylvcondosales.com/mandarin-las-vegas/

I have real estate based websites that add new pages when new listings are added to the market and then deletes pages when the property is sold. My concern is that there are a significant amount of 404's created and the listing pages that are added are going to be the same as others in my market who use the same IDX provider. I can go with a different IDX provider that uses IFrame which doesn't create new pages but I used a IFrame  before and my time on site was 3min w/ 2.5 pgs per visit and now it's 7.5 pg/visit with 6+min on the site. The new pages create new content daily so is fresh content and better on site metrics (with the 404's) better or less 404's, no dup content and shorter onsite metrics better? Any thoughts on this issue? Any advice would be appreciated