A real estate company defendant in a lawsuit has been sanctioned by a Manhattan judge for its failure to preserve evidence and for persisting in deleting e-mails in spite of the court’s repeated warnings to comply with discovery.

Eighteen months after plaintiffs Harold Einstein and Jennifer Boyd sued the Corcoran Group in connection with the alleged deceptive marketing of a condominium, New York Supreme Court Justice Charles Ramos learned that three of Corcoran’s brokers were continuing to delete e-mails from their individual mailboxes.