Google Sitemaps is a relatively new service in an effort to expand Google’s coverage and reduce the time it takes to index your site.
The XML Sitemap format allows several different options allowing you to customize your Google Sitemap.
If is a free service and you are encouraged to re-submit as your site changes. You are required to have a Google Account which is also free.
While there are no guarantees this will improve your real estate website’s rankings in Google, it may be a good way to have your site crawled by the Google bots.
Feel free to post any questions or comments on Google Sitemaps to this thread.