[Note: Cotality is the sponsor of the Industry Relations podcast that I do with Greg Robertson.]

Cotality, formerly CoreLogic, dropped a bomb on the industry this week that I didn't see coming. From the press release reprinted on UK Yahoo of all places:

MINNEAPOLIS, May 12, 2026--(BUSINESS WIRE)--HomeServices of America, a leading provider of homeownership services, today announced a strategic partnership with Cotality – the real estate data and analytics firm formerly known as CoreLogic – to develop and launch BLX, a new listing data interface designed to modernize how real estate content is entered, managed, and distributed across the industry.
The initiative addresses a longstanding structural challenge in residential real estate: fragmented listing data entry across multiple MLS systems, and the resulting inefficiencies in how information is maintained, updated, and shared.
HomeServices of America currently operates across more than 250 MLS relationships nationwide, where listing content is typically entered into local systems before being redistributed. BLX will invert that model, establishing a controlled, brokerage-level environment for listing entry while preserving MLSs as a foundational component of the broader ecosystem.
At the operational level, that means a single point of entry for HomeServices brokerages – allowing agents and administrative teams to input property data once and distribute it across MLSs, consumer platforms, and other approved destinations. The platform is designed to improve consistency, reduce duplication, and strengthen data integrity, while maintaining full compliance with MLS rules and standards.

Industry press is framing BLX as the return of Project Upstream, and notes the obvious connection to all of the kerfuffle around private listings. I rather think BLX is more than that, and potentially a bigger deal than merely Project Upstream. Greg and I debated BLX on our last episode of Industry Relations at some length.

Since recording that episode, I have learned that Cotality held a webinar for MLS executives about BLX. I learned of it because I received a copy of an audio recording of the presentation and a couple of screenshots. My source was annoyed at what s/he saw as gaslighting by Cotality and wanted the information out there. I am happy to oblige.

So let's talk about BLX.