Duplicate Content/ Indexing Question

[AnthonyLasVegas]

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/

[clotairedamy]

There is an good article on this issue here.