Kelowna firefighters were called to a building on fire at Dilworth Drive and Leckie Road Monday evening.
When crews arrived around 6 p.m. they found the roof fully engulfed in flames.
Large plumes of smoke could be seen across town.
Part of Dilworth Drive was restricted to traffic as fire crews responded to the blaze.
The Okanagan Historical Society said the building was a treasure, and its loss is devastating.