A state judge has ruled that Liberty Insurance Underwriters must cover the legal defense of architectural firm Perkins Eastman against a $3.4 million federal lawsuit over its design of a Southampton nursing home, while finding that a second insurer was not liable to defend the suit.

Manhattan Supreme Court Justice Bernard J. Fried (See Profile) ruled on May 3 in Liberty Insurance Underwriters v. Perkins Eastman Architects, 113946/06, that Liberty must defend Perkins Eastman even though it submitted its claim after its coverage ended because the firm warned Liberty during the policy period that it might be sued in the future.