The ceiling and part of the roof at Moose Jaw's Queen's Bench courthouse caved in on Saturday.
Fire crews were alerted to the collapse when alarms started ringing in the building just after 11:00 a.m. CST. They arrived to find more than $1 million in damage. Nobody was inside when it happened.
Police say while the entire roof hasn't come crashing down, most of the decking and support beams have fallen in to the building. At this point, they say it's impossible to get onto the second floor of the building.
Structural engineers will assess the building on Monday to find out what caused the collapse.