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Feb. 12, 2026

CoStar accuses Quinn Emanuel of disloyalty in DQ fight

CoStar Group fired back at arguments opposing its bid to disqualify Quinn Emanuel, accusing the firm of knowingly representing a competitor in active litigation without consent and dismissing claims that an advance waiver or ethical wall could cure what it calls a clear breach of loyalty.

In the most recent escalation of a high-stakes ethical battle, CoStar Group filed a blistering reply accusing law firm Quinn Emanuel of "rank disloyalty" and a surreptitious "tactical power play" for allegedly attempting to represent a key rival while still serving as CoStar's counsel.

The reply came Tuesday in response to an opposition filed by defendant Commercial Real Estate Exchange Inc. (CREXi) to attempts by CoStar to disqualify Quinn Emanuel as defen...

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