Four members of a wealthy family are suing directors of their family’s corporation and Duane Morris, claiming they facilitated an ill-fated transaction that led to $3.8 million in damages while the law firm excessively billed for its services.

The suit—which also names a lawyer who is of counsel at the Philadelphia-based firm and a director of the company—takes issues with the trading of a Walgreens in West Palm Beach, Florida, for an “old, run-down horse farm,” according to the complaint filed Monday in the U.S. District Court for the District of Columbia.