Blockade them from getting food and drink. Jam their internet access. Shut off their electricity and water. I am sure this building has underground tunnels. Block these tunnels with new brick walls and or electric fencing. And keep guards stationed at them. Just in case.
IOW starve them out. If they start fires, let them burn.
I might add a sniper in a bell tower to prevent escape from the burning building. These protesters are as American as the freeloaders crossing our borders with impunity.
“...IOW starve them out....”
Uber Eats, DoorDash, GrubHub onboard with this plan? Lol