The Clocktower as viewed to the east from the Humboldt River in GTA IV.

The Clocktower is a two-building industrial building in Grand Theft Auto IV. Located in BOABO, Broker, and fronting the Humboldt River, the building can easily be spotted immediately south of the Algonquin Bridge by both its large rooftop CLOCKTOWER sign and functional digital clock synchronized to the in-game time. This meant the building is also visible to the right as the player drives across the bridge from Algonquin to Broker. Otherwise, the building is of little use in any part of the game.

The entire complex, including the sign, bears resemblance to 25 Columbia Heights (known for a similarly designed "Watchtower" sign) in Brooklyn, New York City; in real-life, the building serves as a base of operation for the Watchtower Bible and Tract Society, an organization under Jehovah's Witnesses. The Clocktower building's in-game design, however, is scaled down and less modernized than its real-life counterpart. The orientation of the Clocktower's main building is also altered to face north when the Watchtower's faces west in real life.