Universal Property Identification (UPI) Workgroup

The Universal Property Identification (UPI) Workgroup, formerly the Property Unique ID Workgroup will review and build from efforts from the U.S. government, public records industry and other data standards organizations to build the “definitive” standard for the Universal Property Identifier to be used by the real estate industry.

The benefits of a Universal Property Identifier include: easier identification of parcels across market boundaries, unification of public records from multiple sources in one display, faster updates to physical property characteristics.

Additional information on the UPI as well as a detailed system specification can be found here


  • The UPI Workgroup meets the 4th Wednesday of every month from 1:00 – 2:00 PM EST.


UPI Workgroup Chair – Mark Bessett, Senior Enterprise Software/Data Architect for California Regional MLS

Mark is the Senior Enterprise Software and Data Architect for CRMLS. Mark has over 20 years in the technology arena. He has held the positions of Senior Software Engineering Consultant for Microsoft, Staff Systems Engineer for Lockheed Martin and Principle Software Engineer at Honeywell.

Mark is a tech-centric, but business savvy engineer-leader who loves both building and ideation. Mark has worked in multiple industries introducing software and hardware technologies from startups to huge corporations including Lockheed Martin Space and Microsoft. Mark often (and happily) wears many hats in his execution-oriented approach.

Mark is an expert software engineer and experienced thought leader. He has delivered innovative technology solutions to many organizations providing them with key advantages in their industries.

Mark has held security clearances up to TS SCI w/ polygraph and familiar with customers in NRO, NGA and other intelligence agencies.

Mark met his wife in 3rd grade!  They have 7 kids together and Mark enjoys flying, sailing, robotics, and building. Mark has been involved in RESO for over 3 years.

Education: University of Colorado at Boulder, MS Aerospace Engineering.

Past Industry Job: Mark was Enterprise Architect, Senior R&D Engineer, Director of Engineering for Arizona Regional ARMLS

Contact Information – Email: Mark@crmls.org I  Office: (909) 859.2040 x2095

If you are interested in joining, please contact info@reso.org.

Open Source Standards

The Universal Property Identification System Specification has been officially approved by the RESO Board of Directors on December 18th, 2017 and is available for download.

DLU May 31st, 2019