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RESO 2023 Summer Developers Workshop

This is the final chance for developers and technology executives to join peers in creating new technical standards at the RESO 2023 Summer Developers Workshop.

Join virtually or in person in Berkeley, California, for two full days of hands-on development on July 31 and August 1 with an event-opening reception on July 30. | LEARN MORE 

banner - RESO Summer Developers Workshop 2023

Transportation and lodging is your responsibility, but there is no registration cost.

Call for Speakers/Sponsors for RESO 2023 Fall Conference

RESO 2023 Fall Conference | October 24–26 | San Diego, CA | Paradise Point Resort & Spa

RESO Fall Conference 2023 location photo collage

Registration is open and filling up fast for the RESO 2023 Fall Conference. Please join us at Paradise Point Resort & Spa in San Diego, California, October 24–26, with an opening reception on October 23. Hotel information is provided in the registration confirmation. We expect a sellout, so register today!

Now Accepting Speaker Presentation Requests
We are accepting speaker requests for innovative presentations to fill out our standards-based, tech-focused agenda. Is RESO providing a tangible benefit to your company that you want to share? Are you experiencing measurable efficiency improvements by using RESO products? Let us know!

If you or someone you know would be a good fit for our audience, please submit your request.


Sponsorship Slots Still Available for RESO 2023 Fall Conference
RESO events are intimate gatherings that put you in direct contact with the best minds in real estate tech. Sponsorship boosts your brand reach, credibility and leadership in the industry.

Our sponsors gain access to executives and experts from the largest MLSs, real estate technology companies and brokerages. Contact Suzanne Biegenzahn at to learn how to become a RESO conference sponsor.

Summer Enrichment Opportunities

RESO Summer Camp | Data Dictionary & wwRED Orientations

RESO Summer Camp 2023 flyer

You’re invited to join us at the virtual RESO Summer Camp this July 18–19.

Do you want to learn more about RESO’s Data Dictionary?

Do you want to work toward your RED-B designation with the Working with Real Estate Data (wwRED) course but don’t know where to begin?

This is a great opportunity to get familiar with one or both to get your questions answered. There is no cost!

Data Dictionary Orientation
Tuesday, July 18, 2:00 pm ET / 11:00 am PT (1 hour)
If the Data Dictionary is something of a mystery, making you feel like you can’t contribute at workgroup meetings, this is your camp. We will discuss the basics of its functions and answer all newbie questions. | SIGN UP

wwRED Orientation
Wednesday, July 19, 2:00 pm ET / 11:00 am PT (1 hour)
Have you noticed your industry friends adding the RED-B designation to their email signatures and LinkedIn profiles? Do you want one of your own? RESO’s wwRED course provides the keys to how data flows through the industry. The “B” is for Business Module, which covers the organizations, rules, processes and technology systems that create the real estate data ecosystem. Learn about the course and ask us anything! |
SIGN UP                             

For more information, visit If you have further questions about either session, please contact Brian Ohnesorgen at We look forward to seeing you soon!

Product Updates

RESO Analytics, v1.3.4
Certification status icons have been added to the provider drop-down list on the Certification Summary page.

RESO Analytics, v1.3.4: Certification status icons have been added to the provider drop-down list on the Certification Summary page.

RESO Analytics, v1.3.4: The icons are hoverable, showing the status for each certification, including in-process certifications.

The icons are hoverable, showing the status for each certification, including in-process certifications.

The icons may also be useful to providers who have an existing certification and are retesting after making changes or testing a new system.

RESO Analytics, v1.3.4: The icons may also be useful to providers who have an existing certification and are retesting after making changes or testing a new system.

Certification Update

Congratulations to the following organizations for achieving their Data Dictionary 1.7 and/or Web API Core 2.0.0 endorsements and being added to RESO Analytics:

Certification Update: Allegheny Highland Association of REALTORS® Calaveras County Association of REALTORS® Fresno MLS Lake Havasu Association of REALTORS® Lubbock Association of REALTORS® Maine Listings MLS United Montgomery Area Association of REALTORS® North Carolina Regional MLS North Central West Virginia REIN Ojai Valley Board of REALTORS® Quincy Association of REALTORS® South Tahoe Association of REALTORS® Southeastern Indiana Board of REALTORS® Staten Island 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

New Members

RESO July 2023 New Members

Central Illinois Board of REALTORS®
The Central Illinois Board of REALTORS® is a professional real estate association located in Charleston, Illinois, with nearly 600 members.

Dealink has software that runs an entire real estate transaction from start to finish on a single platform, keeping all involved parties updated on process workflows in real time.

Equador flagEcuador MLS
Ecuador MLS is a real estate platform dedicated to connecting buyers, sellers and real estate professionals in Ecuador.

Listgen touts itself as an advanced real estate marketing system.

Saudi Arabia flagManzili
Manzili is a platform to buy, rent or sell properties in Saudi Arabia.

Montgomery Area Association of REALTORS®
Founded in 1948, the Montgomery Area Association of REALTORS® has more than 1,600 members servicing counties in central Alabama.

Real Grader
Real Grader measures, manages and maximizes digital marketing and online reputation for real estate agents.

Türkiye flagTurkiyeMLS
TurkiyeMLS was formed to combat fragmented property data, inconsistent listing information and inefficiencies in property transactions by bringing the promise of a comprehensive MLS solution based on RESO standards to the more than 50,000 real estate professionals in Türkiye.

Canada flagVictoria Real Estate Board
The Victoria Real Estate Board is an association of approximately 1,600 REALTORS® who work and live in the communities of Greater Victoria and the Southern Gulf Islands in British Columbia, Canada.

Welcome to RESO!


Thanks to All OurCanadian RESO Members graphicCanada AEs in Kelowna
In June, RESO spent a few days in Kelowna, British Columbia, speaking with provincial and local association executives about proptech. With nearly 50 Canadian MLSs and associations already part of the RESO membership, we look forward to bringing more standards to Canada.

The sessions were informative, Lake Okanogan was amazing, the events included delicious local beverages and the Cuban poutine was unbelievable.

Through innovation and collaboration, RESO’s Canadian members have laid the groundwork for enhancing data standards in Canada.

Thank you to our growing Canadian membership and their efforts towards the advancement of taking RESO standards international.

White Block E1654543656590

West + Main Instagram (West + Main Broker Open)West + Main Broker Open
While RESO does not have the bandwidth to attend every association, broker or MLS event we are invited to, we will make the effort whenever possible.

In this case, West + Main is a growing brokerage based in Denver that opened an office in Minneapolis. Managing Broker, Greg Fischer (pictured on the left), has been a consistent contributor to RESO’s brokerage meetings and online conversations. This was a great opportunity for RESO to hear fresh ideas as we continue to look for new and innovative ways to support and listen to the needs of our broker members.

Help us grow by participating in the Broker Advisory Workgroup, a great place to discuss broker-centric issues and turn them into RESO standards.

On the RESO Blog

Next in Interoperability: Web API Add/Edit

Next in Interoperability: Web API Add/Edit
The merits of the RESO Web API Add/Edit endorsement were discussed by a panel of leaders from Ocusell, MLSListings, FBS and MRED. Create, update and delete actions are now possible for data from broker back office and other non-MLS software systems. | READ MORE


Omni MLS Brings RESO Standards to 9 Latin American Countries with 12 More on the HorizonOmni MLS Brings RESO Standards to 9 Latin American Countries with 12 More on the Horizon
RESO international membership continues to grow with Omni MLS making its way across Central and South America. The RESO-certified MLS system is now available in nine countries, and a dozen more countries will be ready soon. | READ MORE

A Call for New Media Standards in the MLS

A Call for New Media Standards in the MLS
The Data Dictionary’s Media Resource received a lot of attention at the RESO 2023 Spring Conference. Two sessions highlighted some needed upgrades to account for advances in media technology. | READ MORE


RESO RED-B LogoEarn Your Designation
Complete the Working with Real Estate Data (wwRED) – Business Module and earn your RED-B designation to take charge of your career in data.

Organizations can also greatly benefit from incorporating wwRED into their staff and volunteer leadership onboarding strategy to start the year strong. Bulk discounts are available! | MORE INFO | SEE THE COMPLETE LIST OF RED-B DESIGNEES

In wwRED news this month, 30 people have completed the course! Here’s who completed their RED-B designation during Q2 2023:

RED-B Designations Q2 2023 graphic

Industry News

CMLS Industry Awards
Nominations are open for CMLS industry awards! It’s time to reward CMLS members who have advanced our industry through their guidance and leadership. | LEARN MORE & NOMINATE NOW!

Latest from NAR: iOi in August
Join real estate technology experts at the 5th annual iOi (Innovation. Opportunity. Investment.) Summit in Miami, Florida, August 29–30, to help you uncover proptech solutions to sustain your business and feed your curiosity. Use the promo code “RESO,” to receive $150 off registration costs.

iOi (Innovation. Opportunity. Investment.) Summit 2023More than 700 leaders, investors and forward-thinking real estate professionals come together for two days to fuel the future of the real estate industry. Proptech is driving transformation, and iOi has become the gathering point for all-hands, frank discussions about innovations that seek to tackle the biggest issues of the industry. RESO will be there! | MORE INFO | REGISTER

Why RESO Standards are Set to Revolutionize Real Estate (requires subscription)
Brandon Doyle talked to Greg Sax, Director of Growth at RESO, about RESO’s mission, the power of data, the future of real estate standards and how we are still at the front end of our journey to create meaningful standards that organizations around the world can follow. | READ MORE (requires subscription)

Three Questions

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

The series will take a break in July and return in August. Here’s who has been interviewed since the last RESO Monthly:


RESO Workgroup Meetings

Research & Development Workgroup | June 8, 2023
The group provided updates on ongoing business cases. For the Smart Home Standards business case, the group will suggest clarifying changes to the Smart Home lookup definition to the Data Dictionary Workgroup. The Standard Status Subgroup will revise Standard Status definitions and review certification data of the MLS Status field for possible new additions to Standard Status. The Payload Filter on Certification Pages case may include an additional component of ranking the importance of fields tagged for each payload. An update on the adoption of the Universal Property Identifier (UPI) and its upcoming version 2 release were given, along with an update on the progress of the Unique Licensee Identifier (ULI). | NOTES

Transport Workgroup | June 12, 2023
The group discussed a proposal to support a default subset of selected fields from a given provider. Selecting everything by default can be resource intensive in cases such as the Property Resource, which has a large number of computed fields. This applies to live query clients rather than those using replication, who would typically consume all data they had access to. The group also continued the discussion of Add/Edit with Media, which is one of the Summer Developers Workshop topics. | NOTES

Interoperability Workgroup | June 13, 2023
The chair recapped the 2023 RESO Spring Conference Interoperability Workgroup session. The group discussed each of the new cases that were brought forth and the existing RESO Change Proposals (RCPs) that may be used to help move them forward. A research plan was formed and an unofficial poll taken on the importance of each case. A post for each case will be made within the Current Discussions section of the Interoperability Workgroup home page for further comments. The group also discussed the creation of a best practices guide for using RESO standards. | NOTES

Certification Subgroup | June 15, 2023
The group discussed originating and source system fields with respect to the Model, Field and Lookup resources in addition to their current usage in existing resources, which is common but not standardized. Some clarification was made around testing rules for StandardStatus and MlsStatus in that if a provider has MlsStatus, they MUST have StandardStatus as well. | NOTES

Standard Status Definitions Subgroup | June 20, 2023
As noted in the R&D Workgroup notes, this group is working on revising the Standard Status definitions and reviewing certification data of the MLS Status field for possible new additions to Standard Status.

Commercial Real Estate (CRE) Subgroup | June 21, 2023
The group reviewed the CRE Mapping Spreadsheet with a focus on specific topics and related fields that were identified at the previous meeting and whether they should be included in a CRE standard. | NOTES

Broker Advisory Workgroup | June 22, 2023
The meeting included discussion of two potential new resources for business linkages and MLS data processes. Both would ideally improve collaboration, communication and ease of bringing new products into the real estate data market. The group also discussed how to improve adoption of the Social Media structure of the Data Dictionary and encourage a centralized entry point for that type of data. Additionally, a prospective Data Share Compliance Subgroup was determined not to be needed. | NOTES

Distributed Ledger Workgroup | June 27, 2023
The group discussed the existing Listings on Blockchain and User-Defined Terms-of-Use and Tracking business cases, deciding to “archive” or not pursue them further at this time. The group also decided to shelve potential new business cases, Invocation of Smart Contracts and Replication Through Distributed Ledger. Additionally, feedback for the Transport Workgroup about RCP-025, RCP-027 and RCP-028 was documented. | NOTES

Universal Property Identifier (UPI) | June 28, 2023
A recap of recent group activities was presented, and there was an open discussion about existing UPI topics. The group also gathered feedback and suggestions for how to engage the real estate tech community about UPI adoption and improvement. | NOTES

Data Dictionary Workgroup | June 29, 2023
The meeting included a review of the upcoming Model, Field and Lookup resources, as well as the proposals for conveying local data and supporting multiple metadata locales. The FrontageType vs. WaterfrontFeatures and Safety Fields proposals were reviewed and suggestions were discussed. The request for a Closet Type field was also discussed, and the group decided that further research on potential redundancy with the requested lookups should be conducted. Before being put to a vote, it was determined that the ImageContains proposal will require additional discussion in a special subgroup or at the next meeting. | NOTES

Rental Subgroup | June 29, 2023
The group reviewed Rent Price, Pets and Listing Status. Additionally, the group indicated that they would like to increase participation prior to making any recommendations, and the chair will work with RESO staff on increasing subgroup visibility. | NOTES

Upcoming RESO Workgroup Meetings

If you want to participate in any of the following recurring workgroup or subgroup meetings, email to get started.

  • Tuesday, July 18: Fast Track Subgroup
  • Wednesday, July 19: Internet Tracking Workgroup
  • Thursday, July 20: Data Dictionary Workgroup
  • Thursday, July 20: Certification Subgroup
  • Wednesday, July 26: Universal Property Identifier (UPI) Workgroup
  • Thursday, July 27: Commercial Real Estate (CRE) Subgroup
  • Thursday, August 3: Research & Development Workgroup
  • Tuesday, August 8: Interoperability Workgroup


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