How do we get squirrels out of an attic in a commmercial office building?

We would like to force the squirrels to leave and then seal the areas they have used to enter. Is there a noxious smell, chemical or whatever that will make them leave before we seal the space?

Get a live trap, its a cage with a drop down door bait it and you will get your prey alive and unharmed then just let them go in the wild, any local pest control business should be able to help you

fox urine,,i use the spray kind,,i just get in attic and act like a fox needing to pee

serious---fox urine,,,the fox is natural predator

you will have to get on a ladder and inspect the soffet all around the house looking for a small hole that a squirell could get in, next, if you can get into the attic you will be able to just about pinpoint where they are coming in at .You need to cover any opening that you find with screen or wood, depending upon its location.Good Luck!

Hey call me and i will shoot them. I havent shot squirrels in a while.

seal it up then trap them out with a cage trap or live trap (same thing)

2 options, try a product called Liquid Fence that you can get at many garden or farm supply stores and hardware stores. It has fox urine and a lot of other things that critters don't like. It really smells bad for a couple of hours then only they can smell it. I use it in my garden and it keeps deer, squirrels and rabbits out.
Or
Try Moth balls/cakes, I used to work in the Wisconsin north woods and we would winterize cabins and lodges. We would spread moth balls in the cabins before locking them up for the winter and a moth cake in each room for longer lasting effect. This works good in enclosed areas.

They have to come out to eat why not install a flap that only opens out but not in.