In Grand Theft Auto IV, Broker is the borough based on Brooklyn. It is one of Liberty City's four principal boroughs and occupies the southeastern part of the city, connected to the other areas by bridges and tunnels.
Broker mirrors Brooklyn through its dense residential streets, industrial waterfronts, elevated roadways, and neighborhoods shaped by immigrant and working-class communities. Niko Bellic begins the game in Broker after arriving in Liberty City, and Roman's taxi company becomes an important early base of operations. The borough also contains several recognizable gameplay locations, including Firefly Island, Hove Beach, and the Broker-Dukes Expressway.
The other choices correspond to different New York inspirations: Algonquin represents Manhattan, Dukes represents Queens, and Bohan represents the Bronx. Alderney, which is based on New Jersey, is separate from Liberty City's four boroughs. The fictional names help GTA IV create a stylized version of New York rather than reproduce the real city directly.