Assistant Chief Craig Duke the roof and walls caved in, trapping a lot of combustible materials in the rubble. No one was injured in the blaze.
The fire was reported at 10:45 p.m. Saturday, but firefighters were driven back when the roof collapsed.
The cause has not yet been determined.
The pawn shop was a downtown fixture for nearly 80 years before it closed several years ago.
Information from: The Kansas City Star, http://www.kcstar.com
(Copyright 2009 by The Associated Press. All Rights Reserved.)