Re: Whoever Fights Monsters...
City Hall was a massive, fortified structure. No wonder back when it was the regional Hellstromme HQ, staff and security held out for weeks after the bombs fell (but did not destroy the domed Junkyard). The whole building was crawling with security, both Militia and armed City Hall security personnel.
Dakota, Smoker, Vundra and the others were allowed to wander the lower areas and ground floors. The basements held not just the usual utility and storage but hardened bunkers and fallout shelters. Ground and lower floors held offices and cafeterias. Upper floors were for executive offices, board rooms and conference rooms and an executive dining room. The upper floors were also where the meetings would take place, so access was restricted.
Downstairs, Simon and company made it down the corridor without incident. Security and Militia guided the delegates into elevators which took them to the upper floors. From there they were directed into designated areas, old conference rooms and cafeterias. There was a heavy security presence.