Work by National Association of Realtors

The National Association of Realtors (NAR), whose members are known as Realtors, is the largest trade association and one of the most powerful lobbying groups in North America, having spent more than $99 million between 1999 and 2012. It has over 1.2 million members (as reported November 2008), including NAR's institutes, societies, and councils, involved in all aspects of the residential and commercial real estate industries. NAR also functions as a self-regulatory organization for real estate brokerage. The organization is headquartered in Chicago.

http://www.realtor.org