A lawsuit was filed in late June against Andrew Flynn, the developer of the controversial Copper Mill development in Davis Square, alleging he defaulted on a property purchase in 2025.

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The suit was filed in Suffolk Superior Court by hotelier Guenther Weinkopf, who in March 2025 sold Flynn the Queen Anne’s Inn in Chatham for $9.5 million, plus Weinkopf’s personal residence for another $500,000. Cambridge Day was only able to confirm the deed for the sale of the inn.

The suit, first reported in Banker & Tradesman, said Flynn financed the purchase with a $7.75 million seller promissory note, effectively a loan from the seller, and a $6 million mortgage from Acorn Capital. Weinkopf accused Flynn of defaulting on the purchase agreement, then transferring and selling the property without satisfying his contractual obligations.

Cambridge Day viewed the transfer, mortgage discharge and original deed for the property at the Barnstable Registry of Deeds. The documents show Flynn acquired the property through Queen Anne Chatham LLC, an entity operating out of Copper Mill’s headquarters at 66 Long Wharf in Boston.

According to the suit, Queen Anne LLC was late in making a required interest payment in June 2025. It then stopped making payments altogether in November. In addition, it failed to make a $2.125 million principal installment in April 2026, at which time the suit alleges Flynn cut off communication with Weinkopf.

The suit alleges that in late 2025 the property was transferred to Queen Anne Realty Trust, an entity controlled by members of the Hajjar family, owners of Hajjar Management, a Milton-based property manager and developer. Documents at the Barnstable Registry of Deeds show the transfer was recorded on November 19 for a sum of $ 8.2 million. On the same day, the $6 million mortgage used to finance Flynn’s purchase was paid.  

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Weinkopf further alleges that Flynn “and/or affiliates” profited from the sale and from the return of a $387,500 interest that Acorn Street had required QA LLC to fund. This despite defaulting on the promissory note and failing to honor a legal guaranty requiring Flynn to make the payments under which he assumed, according to the suit, “unlimited” liability.

Flynn did not respond to requests for comment. Weinkopf and his legal team also did not respond.

The City of Somerville, declined to comment on the litigation, saying that the city could not speak on “allegations involving private businesses or their leadership.”

Copper Mill went back to the drawing board after MassHousing months ago raised feasibility concerns with its original design. Flynn released new designs and rented an office in Davis Square so residents could come review its plans.

MassHousing confirmed that the Davis Square project is not currently before the organization for review. It declined to comment on whether the litigation could affect consideration of the project.

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