Who is actually building RPR's tech?

NAR's Realtors Property Resource appears to have subcontracted out significant work, but refuses to clarify

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Luxury Connect | Oct. 16-18 | Beverly Hills

Every year, the National Association of Realtors pours ever-more millions of its members’ dues into a for-profit subsidiary that has never produced a profit and which 88 percent of its members don’t use regularly.