City Hall sees players competing to become Mayor of New York City. They do this by attempting to be the most successful at both bringing people into the city as well as campaigning for the citizens' approval. Whoever best balances these two goals will win the election.
At the end of the game, the citizens of the city will vote based on which player brought them in and that player's approval level. Special interest groups will also collect votes for players based on certain goals, such as Wall Street backing the player with the most money. Whichever player has the most votes on election day will become Mayor of New York and appoint his or her opponents to the Sanitation Department.