If commercial landlords catch wind of tenants selling counterfeit merchandise, they’d better do something about it — or risk losing a lawsuit.

That’s the takeaway from a $1.9 million judgment secured by Miami lawyers David Rosemberg and George Mahfood, who believe the case is the first time a jury has applied a 1992 federal appellate court decision to find contributory trademark liability against a flea market landlord who isn’t also the market’s owner/operator.