No need to pay. The exit room has a different image on the map (just like the room you started in). When you get to that room, there should be an option for "exit" come up as a button on the area to the left of the map you use to move around.
I'm not entirely sure, but I believe the entry/exit room for a civic centre is towards the upper left of the facility map.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
If you are saying you are stuck inside the building, find the room where the button, "EXIT" appears, click it, and another will appear, then click that one, you'll be outside.
If you are trying to enter the facility, move next to it, then click on the enter button that appears. If it does not appear or you can not enter, you likely do not have the proper permissions to enter it.
Warning this is strictly Orions McPhees Opinion, it may or may not have any bearing on events true or imagined