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It would help to know what level of party you're dealing with -- some things will be deadly (and appropriate) for a level 1-5 party but a level 11-15 party will stomp them flat (not to mention the question of how any of the regular occupants of City Hall survived anything...)
There's probably a general anti-teleport and anti-scrying shield over the whole building. A number of doors are probably arcane locked -- the evacuaees MAY be able to give the PCs the password to some ("sure, every janitor's closet opens to 'Broom Hilda'"), but maybe not to others ("no, nobody knows the password to the Mayor's washroom! Or the evidence vault!")
Animated objects may be very plausible (desk, chairs, tables, tapestries, candelabrae...) some as guards put in place by City Hall, others as part of the ongoing attack.
Mayor's Office -- a succubus and a hound archon are weaving back and forth around the desk (respectively tempting and supporting the mayor, and usually invisible, but right now they're too focused on each other.)
City Council Office -- the table, animated by WAY too many coffee spills over the years, doesn't want ANYONE to sit around it droning ON AND ON AND ON about sewage cleanup financing details. It might try to bargain with the PCs (after it, it knows ALL the passwords). Or maybe it just wants to run away back to the hills and be a tree again, and is trying to escape...
Public Works -- a delegation of otyugh sewer workers are there to talk about the pay increase. They got there via their regular secret tunnel to the sewers just after the evacuation, and will assume that the PCs are the new negotiation team ... if they're not attacked on sight. They'll spend the first round waving union cards at the PCs. One might inquire if the PCs want to join the union (after all if they're not management, they must be labor, right?)
A random mephit (or other CR-appropriate mischeveous monster) of some sort may be skipping around the place writing "HASTUR WAS HERE!" on the furniture. Do the PCs read the graffiti?
The horses weren't evacuated from the stable. Pity about that, since the nightmare the Big Bad rode in on is also in the stable... and in heat. (Or maybe it's just killed them all, if you'd prefer, and then animated their corpses. Yeah, it's got a few special powers, and the master's pet familiar got into its sack of wands and is waving things around. Did I mention one of them is a wand of wonder?)
Waiting Room -- the ghost of someone who died here a few hundred years ago and is STILL waiting for someone to talk to about the foundation inspection so they can get busy building.... PCs can exorcise the ghost by finding the permits on-file in the City Clerk's office and giving them to the ghost. Of course, that means facing the animated incinerator with its three minion flying knives.
There will probably be quite a few magic mouths yelling about intruders.
Look up the guards and wards spell covering the attic and all the pigeon coops up there. Did I mention that the gargoyles are getting free?
And whatever you do, DON'T look in the Mayor's breakroom... the illusions there are horrificly bad....