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RESO 2024 Spring Conference

2024 RESO Spring Conference collageThe 2024 RESO Spring Conference will be held April 16–18 in Birmingham, Alabama, with an opening night reception on April 15. | SOUND REASONS TO ATTEND

Register by March 22 to ensure that you get the regular registration price before it increases.

Visit the event site for updated hotel options. | VISIT EVENT SITE

Door Prizes
Providing door prizes allows your company an additional low-cost marketing opportunity to show your support for the industry. To contribute, please contact

Many thanks to our current sponsors:

            Sponsors 03052024

RESO Common Format (RCF) Has Arrived!

RCF screenshotRESO Now Certifies Brokers and Their Vendors
Certification at RESO has traditionally been for MLSs and their software providers. But real estate brokerages and their technology vendors have always been an important part of the RESO ecosystem.

The newly ratified RESO Common Format (RCF) standard offers a new way for non-MLSs to freely and efficiently share data between organizations, opening up opportunities for more certainty in broker technology planning through RESO certification.

RCF empowers a brokerage and its website vendor, CRM company, lead gen portal and back office tools to all talk to each other with data packaged in a simple, well-organized format, keeping the broker’s data accurate and consistent across systems.

The gates have been opened for brokers and their vendors to become the first to be certified by RESO. | READ MORE

Product Updates

RESO Product Updates logoData Dictionary Version 2.1
Approved two new lookups for the GreenVerificationStatus field: 

  • Proposed – Indicates that the verification process has not yet started. Plans or specifications have been proposed as part of a new construction building plan. No construction has started.
  • Expired – Indicates that the verification process is complete. All requirements are complete and official verification documentation is on file or published, but the verification has expired per specific mandatory energy labeling program disclosure requirements.

Approved changes to definitions of existing GreenVerificationStatus lookups, removing mention of occupancy:

  • Complete – Indicates that the verification process is complete. All requirements are complete and official verification documentation is on file or published.
  • In Process – Indicates that the verification process is underway but not complete. Application, plans testing or specifications are in process.

Approved two new lookup additions to the EventType field of the InternetTracking Resource:

  • Sign In
  • Sign Out

Approved retroactively renaming the PowerStorage Resource to PropertyPowerStorage to align with the PropertyPowerProduction Resource.

Approved retroactively renaming the following fields of the Media resource to end in “ID” instead of “Id”:

  • OriginatingSystemResourceRecordId
  • SourceSystemResourceRecordId
  • OriginatingSystemResourceRecordSystemId
  • SourceSystemResourceRecordSystemId

Approved disabling payload validation during certification testing for the following enumerated fields in Data Dictionary 2.0:

  • MLSAreaMinor
  • MLSAreaMajor
  • MiddleOrJuniorSchoolDistrict
  • ElementarySchool
  • HighSchoolDistrict
  • HighSchool
  • ElementarySchoolDistrict
  • MiddleOrJuniorSchool
  • ImageSizeDescription

RESO Analytics report dropdownThis change in testing requirements means that those using string enumerations aren’t required to advertise the corresponding lookups for the included fields in their metadata.

RESO Analytics

Web API Conversion graphRESO Web API Leaderboard Update

More than 92% of U.S.-based MLSs have RESO-certified Web API services.

Vendors, brokers and agents have increased their usage of MLS Web API data feeds from less than 5% of the industry in 2014 to nearly 50% in 2024. More than 66% of these MLSs are committed to a full conversion from RETS to Web API.

RESO tracks the migration to the improved Web API standard.

If your organization is not listed, please contact us to be included and consult our free Web API Transition Guide for advice.

New Members

RM New Members March 2024 FINAL E1709659797480

Bosscat provides a one-stop platform for homeowners and real estate professionals for repair renovation and maintenance services.

Brokers Recruiter
Brokers recruiter is an agent-recruiting company that services the brokerage community.

Element Realty Services
Element Realty Services is a real estate consultant providing property management services.

Mosaik is an operating platform for real estate agents and teams to close deals, generate referrals and create client experiences through collaborative search, listing management, transaction management, advanced analytics and more.

Welcome to RESO!


RESO at Clareity24 MLS Workshop

Left: Sam DeBord shows how the transition to the RESO Web API from RETS is working. Right: Chris Haran of MRED (left) talks with CoreLogic’s Matt Cohen (right) about the big changes coming with RESO 2.0, noting the impact on local fields. Photos by Kevin Hawkins.

Clareity24 MLS Workshop
RESO CEO Sam DeBord joined Chris Haran, Managing Director/CTO at MRED and RESO Interoperability Workgroup Chair at the Clareity24 MLS Workshop in Scottsdale, Arizona, to present “RESO 2.0: MLSs Doing the Work.”

Sam and Chris explained how MLS executives must prepare for major changes coming to their products that RESO certifies. MLSs and their vendors need ample time and proactive planning in order to accommodate new data compliance requirements.

Association Executives Institute (AEI) event logoAssociation Executives Institute (AEI)
RESO will also be attending the National Association of REALTORS® (NAR) annual gathering of association executives, March 11–14 in San Diego.

We will be part of a breakout session called “Embracing Change: A Conversation with Change Makers Inside and Outside the REALTOR® Family” that will also feature Jeff Bosch, CEO of IRES MLS and RESO Broker Advisory Chair; Richard Haggerty, CEO of OneKey MLS; Dionna Hall, CEO of Broward, Palm Beaches & St. Lucie REALTORS® and Beaches MLS; and Charlie Lee, Director of Legal Affairs, NAR.

The group will discuss how MLSs continue to provide efficient, transparent and accessible marketplaces to further serve their participants, subscribers and home sellers and buyers.

On the RESO Blog

Acquiring Listing Media via Web API
See how a video marketing project using the RESO Data Dictionary and Web API to run listing data and photo media through AI quickly evolved into a video-creation tool for real estate. | READ MORE

Hear How RESO Birmingham is Full of “Surprise” This Spring
We know you have options on which conferences to attend. We think ours is worth your while, so we put together several “sound” reasons to join us in Birmingham, Alabama, for the RESO 2024 Spring Conference. | READ MORE

  • Your passion for standards fuels RESO’s industry clout.
  • Your participation is necessary for tech advancement.
  • You will meet industry leaders in an intimate setting.
  • Your office budget will not have a more affordable trip for this much bang. Registration includes most meals, drinks, receptions and more.

Industry News

Organized Real Estate Rankings Updated for 2024
The annual report by T3 Sixty provides insights into MLSs, local REALTOR® associations and state REALTOR® associations, including current subscription/membership numbers, total counts and other metrics. RESO proudly works with T3 Sixty on this endeavor. | READ MORE

MLS-PropTech Digest has launched a print publication for real estate industry executives and proptech enthusiasts. RESO is participating in the first couple of issues. | READ MORE

Intentionally International

The Canadian Real Estate Association Technology Committee
RESO CEO Sam DeBord attended the CREA Technology Committee meetings in Vancouver, British Columbia. At the event, we officially recognized Greater Vancouver REALTORS® as a RESO RED Ambassador for their continued support of the Working with Real Estate Data (wwRED) course by signing employees and volunteer leaders as part of onboarding and continuing education.

The Canadian Real Estate Association Technology Committee and International MLS Forum images

Left: Kat Newel, VP of Business Innovation, Greater Vancouver REALTORS®; Right: “Investment Opportunities in Emerging MLS Markets.”

From the International MLS Forum
As part of our ongoing effort to bring RESO to international markets and international markets to RESO, we are highlighting sessions from the 2023 International MLS Forum in Paris. Save the date for the 2024 forum, October 8–9, in Milan, Italy.

“Investment Opportunities in Emerging MLS Markets” was moderated by Jeff Turner of Tangilla with a panel that included Carlos Grass of Amplify Systems, Matthew Ebrescia of 2nd Generation Ltd and Shayne Fairley of Stellar MLS.

The group touched on the importance of the MLS concept for innovation, data quality and eliminating duplication. | WATCH VIDEO (39:33)


RESO RED-B logoRegister by April 14, 2024, and be entered to win our RED-B Raffle to win a custom red RESO polo shirt and a $150 Amazon gift card.

  • Join our growing community of passionate learners
  • Gain valuable knowledge
  • Develop new skills
  • Connect with like-minded individuals from all over the world

Email to sign up today!

The wwRED course continues to be the best primer for understanding how data flows through the industry. Onboard new employees and volunteer leaders with a group rate and make wwRED your organization’s default training course on your way to earning the RED-B designation. | MORE

Three Questions collage for March 2024Three Questions

The Three Questions interview series introduces you to real estate professionals with a hint of personality and humor. | VISIT THREE QUESTIONS

Recent Entries:

RESO Workgroup Meetings

Transport Workgroup | February 5, 2024
The group approved changing testing requirements for a limited number of enumerated fields in Data Dictionary 2.0; rather than failing when values are not advertised in the metadata for one of these nine fields, providers will receive a warning during the certification process instead. This requirement will be re-enabled next year in Data Dictionary 2.1. There were also some changes to how enumerations are validated for those using the Lookup Resource in cases where the underlying fields never have data in them. | NOTES

Research & Development Workgroup | February 8, 2024
The group discussed the proposed MLS Data Process and Display Rules Resource for which a template of proposed fields has been posted. A plan was laid out for group review, Council of Multiple Listing Services (CMLS) review, making any necessary changes and then a vote by the workgroup. Pain points regarding roster information updates and ambiguity about the source of the data was discussed, along with RESO standards that may be used to help with standardizing data and transport of data. | NOTES

Interoperability Workgroup | February 13, 2024
Business-oriented user stories are being collected for a Best Practices Guide. The group discussed a hypothetical Association Management System (AMS) use case. Stories that answer key questions and data exchange workflows will be incorporated into the guide. Additionally, the group talked about the Payload Filter Business Case and the creation of a simplified Data Dictionary 2.0 sheet to indicate which fields belong with which payloads, beginning with AMS and Offer Management (OM) payloads. | NOTES

Data Dictionary Workgroup | February 15, 2024
The meeting included several votes, all of which passed: 1) changed the names of four fields in the Media Resource to use “ID” instead of “Id;” 2) added two new lookups (Proposed and Expired) to the GreenVerificationStatus field and removed mention of “occupancy” from existing definitions; 3) retroactively renamed the PowerStorage Resource to PropertyPowerStorage; 4) added Sign In and Sign Out lookup options to the EventType field of the Internet Tracking Resource. A newly rebooted Waterfront Data Elements Subgroup will streamline, standardize and reorganize water-related lookups in the WaterfrontFeatures and FrontageType fields. | NOTES

Fast Track Subgroup | February 20, 2024
The group reviewed the [Fast Track 2023-12-19] Suggested Mappings sheet, including the lookups for Appliances, Sewer and Utilities fields, and will review ongoing work being done with the WaterSource field at the next meeting. Suggestions for Appliances, Sewer and Utilities with an outcome date of 2024-02-20 were approved. A spreadsheet will be compiled and posted with lookups that may be beneficial additions to the Data Dictionary. | NOTES

Broker Advisory Workgroup | February 22, 2024
The meeting included a discussion of RESO Common Format (RCF), its potential benefits and real-world use cases. The proposed MLS Data Process and Display Rules Resource, which originated in this workgroup, is now with the R&D Workgroup, and proposed fields have been posted for review. The group also discussed how they currently exchange data in data shares, related pain points and what can be done via available and upcoming standards to address them. | NOTES

Upcoming RESO Workgroup Meetings

If you want to participate in any of the following recurring workgroup or subgroup meetings, it’s never been easier to do so. | JOIN A RESO WORKGROUP

  • Thursday, March 7: Research & Development Workgroup
  • Tuesday, March 12: Interoperability Workgroup
  • Tuesday, March 19: Fast Track Subgroup
  • Wednesday, March 20: Internet Tracking Workgroup
  • Thursday, March 21: Data Dictionary Workgroup
  • Thursday, March 21: Certification Subgroup
  • Wednesday, March 27: Universal Property Identifier (UPI) Workgroup
  • Monday, April 1: Transport Workgroup
  • Thursday, April 4: Research & Development Workgroup

Certification Update

RESO Certified logoCongratulations to the following organizations for achieving their Data Dictionary 1.7 and/or Web API Core 2.0.0 endorsements. Results are viewable in RESO Analytics.

  • Quest MLS
  • South Central Wisconsin Multiple Listing Service

View the certification status of all MLSs on the RESO Certification Map. Please send any address or subscriber count changes to

Questions about RESO certification should be directed to your MLS vendor. Questions about self-testing or the technical aspects of certification may be directed to


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