With the upcoming closing of LeBeouf Lamb Greene & MacRae’s Pittsburgh site on Feb. 1, that office’s attorneys may be asking themselves why the office did not develop a client base in the city that extended beyond Alcoa Inc.

The Pittsburgh LeBoeuf Lamb office had opened in 1993 to devote itself to Alcoa’s national litigation work. The closure represents what some consider the worst-case scenario for firms that rely on one client.