Downtown Petropolis boasted over 100 large buildings 5 years ago. Since then, 60 of those buildings have been demolished. Since the number of large buildings in a downtown is an indicator of the economic health of that downtown, it is clear that downtown Petropolis is in a serious state of economic decline.
 Significantly fewer than 60 new large buildings have been built in downtown Petropolis during the past 5 years is an assumption required by the argument.