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Product Updates

PU June 1 1 E1717763012922

July 2024

Data Dictionary

Building Subgroup Proposal – The fields of the proposed Building Resource were approved by the Data Dictionary Workgroup.

Concessions in Price – The following fields and lookups were approved: 


  • ConcessionInPrice (Number)
  • ConcessionInPriceType (Lookup) 
  • SellerConsiderConcessionYN (Boolean)
  • ConcessionsClosingCosts (Number)
  • ConcessionsPropertyImprovementCosts (Number)
  • ConcessionsFinancingCosts (Number)
  • ConcessionsBuyerBrokerFee (Number)
  • ConcessionsOtherCosts (Number)


  • $ (ConcessionInPrice)
  • % (ConcessionInPrice)

Waterfront Data Elements Subgroup

A proposal for a new resource for conveying information about nearby bodies of water was approved to be sent to the main Data Dictionary Workgroup.

RESO Analytics Version 3.1.0 Release Notes – New Testing Configuration Generator

  • Providers may now export their prefilled Certification Environment File from the My Account section of the toolbar.
  • The exported file will contain the user’s credentials and Certification API Key.

Product Update Image 1 July 2024

Product Update Image 2 July 2024

June 2024

Data Dictionary 2.0

The RESO Data Dictionary 2.0 standard represents a large improvement in standardization, particularly in lookups (aka enumerations) and data quality. Users of RESO-certified systems can expect increased predictability and consistency, as all payload data elements will be correctly advertised in their metadata, and all payload data will match what is advertised. | VIEW RELEASE GUIDE

All current Data Dictionary 1.7 certifications will be downgraded to “Certified Legacy” on April 15, 2025. MLSs and other data providers should upgrade their certifications to Data Dictionary 2.0 prior to that date.

May 2024

Data Dictionary

The Data Dictionary Workgroup voted to add fields named BackOnMarketTimestamp and CurrentPrice. Additionally, CurrentPrice will be removed as a synonym of ListPrice.


The Transport Workgroup voted to create a RESO Change Proposal (RCP) for the Add/Edit with Media addition to the ratified Web API Add/Edit.

Universal Property Identifier (UPI)

The UPI Workgroup approved to adopt a URN-based UPI Version 2.0.


Minor changes to certification testing created a new effective ratification date for Data Dictionary 2.0 of April 15, 2024.

April 2024

Data Dictionary

  • Approved revisions to the definitions of the Standard Status lookups as proposed by a RESO focus group.
  • Approved an initiative to create a stand-alone WaterHeater field to convey information about water heaters. Water heater information is currently contained in the Appliances lookups.
  • Approved two new lookups under HorseAmenities: Indoor Arena and Outdoor Arena.

March 2024

Data Dictionary 2.1

Data Dictionary Naming Conventions – Approved the motion to change the following resources to singular form in the next version release:

  • ContactListingNotes to ContactListingNote
  • ContactListings to ContactListing
  • Contacts to Contact
  • PropertyRooms to PropertyRoom
  • PropertyUnitTypes to PropertyUnitType
  • Rules to Rule
  • TeamMembers to TeamMember
  • Teams to Team

Approved the motion to add a field called OpenHouseModificationTimestamp to the Property Resource.

Data Dictionary Naming Conventions – Approved the motion to change the following resources to singular form in the next version release:

  • ContactListingNotes to ContactListingNote
  • ContactListings to ContactListing
  • Contacts to Contact
  • PropertyRooms to PropertyRoom
  • PropertyUnitTypes to PropertyUnitType
  • Rules to Rule
  • TeamMembers to TeamMember
  • Teams to Team

Approved the motion to add a field called OpenHouseModificationTimestamp to the Property Resource.

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 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

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

    RESO Analytics report dropdownRESO Analytics

    February 2024

    RESO Web API Add/Edit is Official

    The newly ratified standard is now available for certification. | LEARN MORE

    January 2024


    The board ratified four RESO Change Proposals (RCPs):

    Data Dictionary

    Data Dictionary Naming Conventions – Approved the motion to change the following resources to singular form in the next version release (Data Dictionary 3.0):

    • ContactListingNotes to ContactListingNote
    • ContactListings to ContactListing
    • Contacts to Contact
    • PropertyRooms to PropertyRoom
    • PropertyUnitTypes to PropertyUnitType
    • Rules to Rule
    • TeamMembers to TeamMember
    • Teams to Team

    The motion to add a field called OpenHouseModificationTimestamp to the Property Resource has been approved.

    December 2023

    Data Dictionary

    The Data Dictionary Workgroup moved forward with enumerating Architectural Style, including values from well-recognized industry lists and high-usage items from RESO Analytics. The following lookups passed:


    French Provincial

    Raised Ranch

    Art Deco




    Gothic Revival



    Greek Revival







    See Remarks

    Cape Cod

    Mid-Century Modern










    Split Level







    Dutch Colonial







    Queen Anne


    Alphabetical List of Certified Organizations

    Our alphabetized certification status list has returned and is now tied directly to RESO Analytics, as is the RESO Certification Map. The list is now driven by the RESO Unique Organization Identifier (UOI) Service and the Public Organizations feed. Organizations on the list may be expanded to show their certification status and a link to their certification summary on RESO Analytics.

    screenshot website data provider listings

    RESO Certification Map

    The map is now driven by certification data from RESO Analytics and the RESO UOI Service. Certification statuses for the organizations represented on the map are updated in real time, based on certification self-testing done by data providers.

    Organization certification map

    Map Tooltips

    Map tooltips have been updated with the latest certification data from RESO Analytics, along with a link to the certification details for the organization represented.

    Certification map pop up

    Certification Status Charts

    Pie charts have been added to show the breakdown of certification statuses by organization. There are three charts: Combined (all types of data providers), MLSs and Pooled Platforms. The chart sections are hoverable, showing the exact count of organizations in the selected section.

    certification pie graphs

    certified current pie graph


    Certified Current Definition

    In order to be considered “Certified Current,” organizations must now be certified for both Web API Core 2.0.0 and Data Dictionary 1.7.


    November 2023


    The RESO Board of Directors ratified Data Dictionary 2.0, Web API 2.1.0 and RESO Common Format at the RESO 2023 Fall Conference.

    More will be shared about these exciting developments on RESO’s website, in the RESO Workgroup Collaboration System, on RESO’s GitHub and in future issues of RESO Monthly. You can also expect to see updates on the Data Dictionary Wiki before the end of 2023, as Data Dictionary 2.0 exits “draft” status and becomes the prevailing standard.

    What’s important to know about RESO Common Format is that it will allow for more certifications for non-MLS technology.

    vendor x mls relationship inforgraphic


    October 2023

    Data Dictionary

    • Heat Pump Water Heater was approved as a lookup under Appliances.
    • Data Dictionary 2.0 will be closed to new changes on October 31, 2023.

    The following resources voted in as plural for version 2.0 will be updated to singular:

    • CaravanStops – Change to CaravanStop
    • MemberStateLicenses – Change to MemberStateLicense
    • OfficeCorporateLicenses – Change to OfficeCorporateLicense

    The following LookupNames will also be changed to singular:

    • CaravanStopsResourceNames – Change to CaravanStopResourceName
    • CaravanStopsClassName – Change to CaravanStopClassName

    Data Dictionary Subgroups

    Fast Track
    The group is reviewing suggested mappings for nonstandard enumerations collected via certification testing in RESO Analytics, starting with the most commonly used fields, and they recommended to restrict enumerations for Country and StateOrProvince fields to ISO standards and to cross-validate them.

    Commercial Real Estate (CRE)
    The group recommended that the CRE standard takes the direction of a new Data Dictionary class as opposed to new resource(s).

    The group recommended a new multiselect lookup field called LeaseTermOptions with the same lookup options as LeaseTerm, plus the addition of options for 3 Months and 9 Months. These options are meant to better convey rental listing information.


    • Supporting Single Feeds (RCP-035) – The group approved the creation of a specification and testing rules based on the Single Feeds GitHub discussion.
    • RESO Common Format (RCP-025) – The specification was approved.
      • Testing rules approved by Certification Subgroup were added to the RESO Common Format proposal. 
      • Two implementations have been verified.
      • Beta testing tools have been created.
    • Deprecated Data Elements (RCP-045) – The creation of a specification to indicate when a data element has been deprecated has been approved. This could be a resource, field or lookup.
    • Conventions for Data Dictionary Resource and Route Naming – Naming conventions for Data Dictionary data elements were approved, including a change to make all resource names singular.


    The UPI Workgroup has proposed a UPI Version 2.0, which involves retaining the formatting of the parcel identifier from the county or other relevant authority.


    September 2023

    Data Dictionary

    • ShowingServiceName was approved. | FULL DETAILS
    • Engineered Hardwood was approved as a lookup under Flooring.
    • ClosetType was approved for the PropertyRooms Resource. | FULL DETAILS
    • A new set of REALTOR® Safety Fields was approved. Four items will move from ShowingRequirements to a new ShowingConsiderations field that will also contain ten other items.Three items will move from ShowingRequirements to PropertyCondition. The final result of the REALTOR® Safety Fields Proposal is shown below.


    • Day Sleeper
    • Electricity Not On
    • Inconsistent Cell Service
    • Limited Visibility From Road
    • Minimal Exterior Lighting
    • Minimal Interior Lighting
    • No Heat
    • No Interior Lighting
    • Occupied
    • Pet(s) on Premises
    • Remote Location
    • Security System
    • See Remarks


    • 24 Hour Notice
    • Appointment Only
    • Call Listing Agent
    • Call Listing Office
    • Call Manager
    • Call Owner
    • Call Tenant
    • Combination Lock Box
    • Do Not Show
    • Email Listing Agent
    • Key In Office
    • Lockbox
    • No Lockbox
    • No Sign
    • Restricted Hours
    • Showing Service
    • Text Listing Agent
    • See Remarks


    • Fixer
    • New Construction
    • To Be Built
    • Under Construction
    • Updated/Remodeled


    August 2023

    Data Dictionary

    Co-Ownership was previously voted in as a lookup under the PropertySubType field for Data Dictionary 2.1. There was a request to move the Co-Ownership option under PropertyType instead, but the Data Dictionary Workgroup voted against this measure. Co-Ownership will continue to be a lookup under PropertySubType.

    FrontageType vs. WaterfrontFeatures
    This proposal would streamline the lookups of FrontageType and WaterfrontFeatures. The Data Dictionary Workgroup is exploring moving certain lookups to CommunityFeatures. Further research into certification data is underway to see how many providers offer just one or both FrontageType and WaterfrontFeatures fields.

    The direction of ImageContains is a new multi-select lookup field that will convey multiple subjects in an image. Some of the more specific items from ImageOf will be put in ImageContains. Additional appropriate items for ImageContains will be gathered with help from fields like Appliances and InteriorFeatures.

    ImageOf would be broad items like Backyard and ImageContains would be Fence and Patio. One ImageOf can have many ImageContains. For example: “This is an image of a backyard that has a patio and fence in it.” A proposal for the actual lookups will be out soon.


    July 2023

    RESO Analytics, v1.3.4

    Certification status icons have been added to the provider drop-down list on the Certification Summary page.

    Certification Summary infographic

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

    screenshot notification settings

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

    screenshot blacknight


    June 2023

    Data Dictionary

    Two new subgroups are forming under the Data Dictionary Workgroup.

    Fast-Track Subgroup
    The release of Data Dictionary 2.0 will bring new tests on enumerations. The self-testing system will allow data providers to make suggestions for additions or changes to the Data Dictionary. The workgroup is proposing a new model to fast-track the release of high-priority changes without having to wait for major dictionary version changes that could take a year or more to ratify.

    This subgroup would create the process to release those changes into the Data Dictionary at a quicker pace. If you would like to participate, please email

    Building Subgroup
    A proposal initiated by the Real Estate Board of New York (REBNY) suggests that a new resource called Building should be added to the Data Dictionary. The goal is a more accurate description of vertical residential properties. Property features for a building can be different from those of a unit. For example, in a rental listing, the building allows dogs, but the condo owner does not.

    Metadata has been collected from several providers, including REBNY’s Residential Listing Service (RLS), and will be aligned with the Data Dictionary to identify candidate fields for a new resource.

    Please comment on this post if you are interested in helping to shape the fields of a potential Building Resource.

    RESO Analytics

    RESO Analytics: Auto-Archiving Certification EndorsementsProviders may now archive endorsements and should do so for any organizations that they are no longer serving or contain results that are otherwise unwanted.

    Archiving is available for endorsements in Passed, Notified, Certified, Canceled or Withdrawn status and is performed by selecting the status button for the endorsement to be archived and then selecting Archive.

    Auto-Archiving Certification Endorsements: Endorsements in the statuses of Passed, Notified, Canceled or Withdrawn are automatically archived and replaced if a new endorsement of the same type is submitted by the provider. A new Performance Report will also be generated for any endorsement that is auto-archived and replaced. Endorsements in the Certified and Revoked status are not archived and replaced.

    Multiple Statuses of Endorsements: Providers are able to retain existing endorsements that are in a permanent status (Certified, Revoked) alongside new in-progress endorsements of the same type.

    endorsement screenshot

    screenshot dashboard sorting optionsProvider System Names: Provider system names have been added to certification reports. Providers may offer more than one system, and the addition of the name allows them to be distinguished from one another. System names have been added to the following reports: Data Dictionary and Web API Reports, Certification Summary Report, and Performance Report. Providers that would like to change their system name may reach out to, and it will be updated by RESO staff.

    Sort Options Improved: The name and time sort on the endorsements page has been streamlined to a single menu, requiring fewer clicks.

    Improved Clipboard Functionality: The page header bar, endorsements and summary pages allow for copying an organization’s Unique Organization Identifier (UOI) by selecting the clipboard icon.

    screenshot search

    May 2023

    Data Dictionary

    Coming Soon approved as a new lookup under the ChangeType field
    Workgroup voted to create Agent/Office biography and media fields (business case from R&D Workgroup)

    Web API Transition Guide

    RESO has produced a Web API Transition Guide to help organizations along on their own journey toward the API standard. We encourage everyone reading this who has not transitioned fully to RESO Web API to add this to your 2023 reading list.


    April 2023

    Data Dictionary

    Lookups Approved for PowerStorageType

    • Lithium Ion Battery
    • Lead Acid Battery
    • Lithium Iron Phosphate
    • Other
    • Unknown

    2023 RESO Winter Developer Conference


    Items that were discussed at the 2023 Winter RESO Developer Conference include:

    • More user-friendly and extensible metadata resources for models, fields and lookups
    • The ability to advertise capabilities, like whether a field is searchable, updatable or expandable
    • Support for locale, internationalization and local data elements
    • Pushing payloads to data consumers using web hooks and RESO Common Format
    • Add/Edit for Media resources using streams to update photos or videos


    March 2023

    Data Dictionary

    Current and future versions of Data Dictionary in spreadsheet format have been added to the home page of the Data Dictionary Workgroup on RESO’s workgroup collaboration system, Confluence, and to RESO’s website.

    RESO Web API Transition Guide

    We are excited to share an initial draft of Transitioning Your Customers to RESO Web API: A Guide For MLS Leaders. This guide will help you get started and see the transition through to completion.

    This is just version 1.0. We welcome suggestions/edits from the community before we unveil a printed version 2.0 at the upcoming RESO 2023 Spring Conference in San Antonio, TX, April 18–20.

    Feel free to contact us at with any suggestions. This is a team effort, and we are grateful for your contributions.


    February 2023

    Data Dictionary

    A new resource and accompanying fields were approved for Data Dictionary 2.0.

    • PowerStorage
      • PowerStorageType
      • NameplateCapacity
      • DateOfInstallation
      • InformationSource


    Data Dictionary JSON Payloads (RCP-025) has been renamed RESO Common Format.

    reso api guide coverTransitioning Your Customers to RESO Web API, A Guide for MLS Leaders has been produced with feedback from dozens of member organizations.

    MLSs, technology vendors and brokerage companies contributed their experiences in preparation, communications, scheduling and distribution for a successful transition from RETS to Web API.

    Version 1.0 of this guide will be distributed in Q1 to all MLSs via email. RESO is seeking your feedback to continue improving the guide.

    A final version will be printed and shared with attendees at RESO’s Spring Conference in San Antonio, TX.


    January 2023

    Data Dictionary

    A field to contain a listing’s participant-provided contact phone or email called AttributionContact was voted into Data Dictionary 2.0.

    A field called CompensationComments was voted into Data Dictionary 2.0.

    A field called GrossLivingAreaAnsi was voted into Data Dictionary 2.0.

    A lookup called Affiliate under the MemberType field was voted into Data Dictionary 2.0.

    A lookup called Steel Frame under the ConstructionMaterials field was voted into Data Dictionary 2.0.

    The Owner Will Carry lookup of the ListingTerms field’s definition was corrected to read, “The seller will carry the mortgage note.”

    A new Resource called InternetTrackingSummary, as well as new fields and lookups, were voted into Data Dictionary 2.0.


    The Lookup Resource additions to the Data Dictionary 1.7 specification were approved.

    Changes were made to the proposal for Metadata Localization, and the group approved moving forward with producing a specification.

    Two implementations of the RESO Common Format proposal have been identified. The group will review the specification and testing rules next.

    The draft Add/Edit (RCP-010) proposal has been updated to reflect the changes from the original proposal. One implementation has been validated.

    RESO Analytics

    The v1.3.0 release of RESO Analytics contains the following features:

    Performance Metrics Improvement – Estimated Seconds per 1,000 Records
    Estimated Seconds per 1,000 Records as a large number metric, including industry averages.


    screenshot performance histogram


    Addition of Sort by Time in Endorsements List
    Users can now sort by time in the endorsements list.

    This will show each endorsement individually rather than grouped because they could have been tested/approved at different times.

    dashboard screenshot buttons

    Archive Reports Feature
    Added the ability to archive reports for providers and admins.

    Providers should archive their reports when they have results they no longer want or if they have a customer that they no longer are doing business with.

    The public feed will be updated automatically if a provider archives their reports, and their “pair” will not be counted as certified for an MLS with only one of the two required endorsements in cases where they only archive one endorsement (e.g. Data Dictionary) and not the other (e.g. Web API).

    Notifications will be sent to the provider of the endorsement, not the recipient, when an item is archived.

    RESO admins can also archive reports, which is a softer option than to revoke them. The provider will be notified if RESO archives an endorsement.

    High-level statistics will be saved when reports are archived, as RESO will be offering provider metrics in the future. This will allow providers to see whether they have improved against their historical averages, including standardization and performance statistics.

    dashboard feature screenshot

    RESO Public Feeds
    A new organization service is available for those wanting the authoritative source for Unique Organization Identifiers (UOIs). It matches the schema of the OUID Resource in the Data Dictionary.

    The data reflects current organization and endorsements feeds also used for certification and provides a formatted view of high-level statistics.

    1. Organization Feed
    The orgs service shows the data from the production UOI service in JSON format, matching the OUID Resource.

    2. Orgs Plus Endorsements Feed
    Parameters may be passed to show the endorsements for each org as well.

    3. Formatted Stats Feed
    There is also a service that shows formatted metrics in JSON format.

    The response looks like the following:

      screenshot - reso certification JSON

      Each bucket we certify is represented, as well as an “All” category, showing everything.

      For MLSs to be counted as “Certified Current,” they MUST have approved Data Dictionary and Web API Core Endorsements. As of this afternoon, there are 233 Certified Current MLSs and 184 Passed Current. We should perhaps reach out to the Certified Legacy and Uncertified.

      This information will be the same that drives the map and the other lists on the public RESO site, and a working demo of that can be found here:

      Coming in Certification v1.4.0
      Provider and Market Alignment Tools, including comparisons against Industry Aggregates.

      Those interested in beta testing this product should reach out to

      reso analytics dashboard screenshot

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