WASHINGTON -- A subsidiary of the National Association of Realtors that's building a national property database has entered into licensing agreements to obtain listings data from groups representing more than 210,000 Realtors in 43 U.S. markets.Realtors Property Resource LLC -- the subsidiary NAR launched in November to build and operate the database -- is currently beta-testing the parcel-based database with nearly 1,000 Realtors in 14 markets.When RPR goes live some time in the next three to four months, all of NAR's nearly 1.1 million members will be able to log into the system to access public property records and other contextual data regardless of whether their MLS is providing listings.Only the roughly 185,000 Realtors in the beta test markets will have have full access to the datab...