CoStar Group launched Apartments.com Ai on June 16, 2026, a conversational apartment search experience built on the platform's multifamily listing data and Matterport 3D Tours, per a Business Wire press release. The product extends and rebrands the AI Smart Search feature CoStar deployed sitewide on Apartments.com in January 2026, adding voice interaction, community comparisons, and guided 3D tours. Andy Florance, CoStar Founder and CEO, is quoted in the release: "Finding an apartment is one of the most important decisions people make, yet the search process has remained largely unchanged for years." CoStar's own whitepaper data, analyzed in May 2026 by Propmodo, credited Smart Search with 35 million sessions in its first two months and self-reported engagement lifts including 56% higher lead conversion -- though Propmodo flagged self-selection concerns and the absence of signed-lease data. CoStar built its Homes.com AI on Microsoft Azure OpenAI in February 2026 and has signaled intent to extend that infrastructure across its portfolio, including Apartments.com.
What happened
CoStar Group launched Apartments.com Ai on June 16, 2026, per a Business Wire press release. CoStar describes the product as replacing traditional dropdown-filter search with real-time text and voice conversations that understand renter preferences, compare communities, surface recommendations, and guide users through Matterport 3D Tours. The release quotes Andy Florance, Founder and CEO of CoStar Group: "Finding an apartment is one of the most important decisions people make, yet the search process has remained largely unchanged for years." The feature is available to every visitor on Apartments.com and is presented as available immediately at launch.
Context -- what this builds on
Apartments.com Ai is an upgrade and rebrand of CoStar's AI Smart Search, which launched sitewide on Apartments.com in January 2026. According to a CoStar whitepaper analyzed by Propmodo (May 26, 2026), Smart Search accumulated 35 million sessions in its first two months. CoStar self-reports that Smart Search users spent 94% more time on listings, viewed 61% more listings per session, saved 212% more properties, and submitted 56% more leads compared with renters using traditional search over the same period. Tour requests -- the highest-intent lead type -- were 144% higher. Stuart Richens, VP of Product at Apartments.com, attributed the lift to reduced friction rather than self-selection; Propmodo noted that every comparison involved self-selected user groups and that the company has not published methodology allowing independent replication. Lease-level outcome data -- the metric operators most want -- is not yet disclosed.
Technical underpinning
For its Homes.com AI, launched in February 2026, CoStar used Microsoft Azure OpenAI (Foundry) and signaled intent to extend conversational AI across its portfolio, Apartments.com included. The Apartments.com Ai press release does not name a model provider or infrastructure vendor for the current launch. The product integrates Matterport 3D digital twins and Apartments.com's proprietary multifamily listing data.
Competitive backdrop
Apartments.com and its parent CoStar Group operate in direct competition with Zillow's multifamily rentals business. Propmodo notes CoStar generated over $1 billion in Apartments.com revenue in 2024, roughly a third of group revenue. CoStar markets a "your listing, your lead" model. A Smart Search 2.0 beta, previewed in the same whitepaper, shows substantially higher claimed lifts (268% more listing time, 602% more leads), though Propmodo cautioned these beta cohorts are unrepresentative of production rollout.
What to watch
- •Whether CoStar discloses lease-level conversion data from Smart Search or Apartments.com Ai to move from engagement metrics to confirmed leasing outcomes.
- •The rollout of upfront fee visibility planned in Smart Search 2.0, which intersects with FTC rulemaking on rental housing junk fees and state-level all-in pricing laws.
- •Any disclosure of the underlying model or vendor powering the conversational layer on Apartments.com Ai specifically.
Scoring Rationale #
A notable domain-specific conversational AI product launch from a major real estate portal, but primarily announced via vendor press release with limited independent corroboration of the June 16 event itself. The predecessor Smart Search launched in January 2026, so this is an upgrade and rebrand rather than a truly new capability. Propmodo's independent analysis raises self-selection concerns about engagement metrics and notes lease-level proof is still missing, placing this solidly in the solid-but-niche range.
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