REALTOR Associations Should Download the San Diego Case Study

For decades, the relationship between REALTOR associations and MLS organizations has followed a familiar structure. Associations often own the MLS, frequently through a for-profit subsidiary, and MLS access has traditionally required association membership. That model is now under increasing legal, competitive, and strategic scrutiny. A new WAV Group case study examining San Diego’s long-standing Open MLS environment offers real evidence to help leaders evaluate their next move.  

Antitrust Risk is Real

Antitrust risk is not abstract. Plaintiffs in the courts have repeatedly challenged policies that tie MLS access to association membership. National guidance has shifted as well, returning local discretion on membership requirements while acknowledging legal exposure tied to restrictive access.  

For associations that own MLSs, this creates a governance question:

  • Continue legacy structures and accept legal uncertainty
  • Or modernize governance while strengthening association value

The case study provides clarity grounded in decades of operational experience rather than speculation.

Association Membership Does not Crash

Many association leaders worry that removing mandatory membership could reduce dues revenue and weaken the organization. The San Diego example strongly suggests otherwise.

Despite operating under an Open MLS framework since the late 1970s:

  • About 99% of MLS participants still maintain REALTOR membership
  • Non-member MLS users represent only about 1% of subscribers
  • Most non-members are mortgage professionals, commercial brokers, or investors rather than traditional residential agents  

In practical terms, membership stability has followed market cycles, not MLS policy changes.

What Associations Gain

Open MLS can create advantages beyond risk reduction:

  • Reduced antitrust exposure
  • Stronger voluntary value proposition for membership
  • Potential new MLS revenue streams
  • Greater industry goodwill and inclusivity

Most importantly, it reframes the association as a value provider rather than a gatekeeper. This is not theory or advocacy. It is operational evidence from one of the longest-running Open MLS environments in the United States. For association executives, MLS boards, and industry policymakers, it provides:

  • Historical legal context
  • Membership impact data
  • Practical governance insight
  • A roadmap for future strategy

If your organization owns an MLS, this is essential reading. The decisions made today will shape governance, risk exposure, and member value for decades.