The City Hall is the place where most of the legal movements take place such as voting for president, speechs of the president and other legal terms.
This place is also the Headquarters of the President Faction. Every player that is in the President's Faction will respawn inside the City Hall.
You can also contact the President for very important issues inside the City Hall.
Where can I find the City Hall in San Fierro?Edit
The City Hall is east of SFPD.