Once you begin parachuting, it should be visible as it is the tallest spire in the area.
Next, if you look at the map, the city hall is about a block southwest of the Los Santos Customs in Rockford Hills. The important part about making your way to this location is first you need to get a plane or a helicopter that you can parachute out of. This is a hard location to get to the only way in is to parachute.Great spot to fight enemies with lots of cover and a large field of view.This location provides a wonderful view of Rockford Hills.Because of this it can serve as the next place to fight off the cops, or a location that really gives you the edge on enemy players. It provides a great overview of its part of the city, as it's the only tall building in the surrounding blocks. But when you do it can prove to be a very awesome location to go to. This tower in Rockford hills is actually fairly hard to come across.