city hall 
noun
1The administrative building of a municipal government.Philadelphia's new city hall was the tallest building in the world....
- City administrators convened again at city hall on May 15 to discuss funding approval to continue operation of the plant.
- After receiving the petition, city administrators met at city hall and decided to call for a further clarification of the laws.
1.1North American Municipal offices or officers collectively: they cultivated close ties with City Hall...
- Nevertheless city hall threatened the dog dealers with jail time and seizure of vehicles.
- Once city hall realizes they can buy you off with a bocce court, you're in trouble.
- Doubtless city hall will ask Washington to replace lost tax revenues, but the Feds should adamantly refuse.