CoStar Hit With 'Hub-and-Spoke' Antitrust Suit Over Commercial Rents

June 22, 2026

CoStar Group and five of the largest commercial real estate brokerages in the US have been named in a proposed class action that accuses them of fixing office, retail and industrial rents, in a case first reported by Bisnow.

Commercial tenant FitFactariDC LLC filed the suit on 12 June in the US District Court for the Northern District of Illinois, naming CoStar alongside CBRE, Colliers, Cushman and Wakefield, JLL and Newmark. It alleges a hub-and-spoke conspiracy in breach of the Sherman Act, with CoStar cast as the hub that gathered and redistributed sensitive lease data, and the brokerages as the spokes feeding in their own figures to see what rivals were charging.

According to the complaint, this gave defendants visibility they could use to hold the line on rents. The suit alleges they were, in its words, "Armed with near-real-time visibility into competitors' bottom-line lease terms, Defendants were able to align asking rents, reduce concessions, and resist tenant negotiations without fear of being undercut." FitFactariDC, which signed a Denver office lease brokered by one of the firms, says it paid rents that were artificially inflated as a result.

CoStar has rejected the claims firmly. General Counsel Gene Boxer told Bisnow that the "slapdash complaint" showed a lack of knowledge about the company, its customers and the wider sector, and that CoStar expects a "swift and complete victory" in court.

"The claim that CoStar Group is part of a 'conspiracy' to raise rents for commercial tenants is contrary to common sense, lacking in any facts, and frankly frivolous," Boxer said in a statement sent to Bisnow. "CoStar Group has consistently emphasized that transparent, high-quality market data helps market participants make more informed decisions and improves overall market efficiency."

It is the second class action aimed at CoStar in recent months. In April, the company dismissed a separate suit over LoopNet exclusivity as an "embarrassment", and it remains locked in a long-running monopoly dispute with rival Crexi that the Supreme Court let proceed in March.

June 22, 2026
Since March 2020 Edmund's job has been to read about, write about, collect data on, analyse and generally know about real estate marketplaces and the companies that run them. Before that he worked at the aggregator Mitula Group (which became Lifull Connect) for five years.

Subscribe to our mailing list to get the famous, free Friday newsletter!

News and analysis to help build better online marketplace businesses, in your inbox, every Friday

Related News

People 100726
People Roundup: OLX Group, Enjoei, Newhome.ch, Carousell Group

We'll start this week's People Roundup in Europe...   Europe: OLX Group names new CMO OLX Group has appointed Andrew...

Read More
Investment Roundup 100726 1
Investment Roundup: Dubizzle Group and Ringier Invest, Realtor.com Divests, MiMove Raises

We have a couple of interesting investments and divestments for you this week...   North America: Move Inc. sells Moving.com to...

Read More
zillow redfin lawsuit 2
Class Action Lawsuit Filed Against Zillow for Alleged Securities Fraud

A class action lawsuit has been filed against Zillow Group and some of the Company’s senior executives for securities fraud...

Read More
Product Roundup 100726 3
Product and Services Roundup: Bayut, Hemnet, Realtor.ca, Rightmove

This week's Product Roundup features launches in the UK, UAE, Sweden, Korea, and Canada. As is customary at this point,...

Read More

Editor's Pick