There was a story on NPR a few months ago where they were talking to firefighters in the Detroit area. They've got many abandoned buildings there now and they'd recently lost a person fighting a fire on one of them. What they were starting to do was go around and mark the clearly abandoned (and often extremely dilapidated) buildings so they'd know they fall into the "let it burn but not spread, don't risk anyone" category.
Of course, those abandoned buildings are all in tax arrears and doing fire/police activity on them is a drain on the cities which are already in fairly tough situations.
When things get that bad it seems like it would make more sense to tear them down than to let them be fire/crime magnets. You might even generate some jobs from the demolition/salvage operations.
It doesn't seem to be significantly different from a company deciding to close and demolish an unused factory (for which there is no longer any use) rather than letting it deteriorate while you pay taxes/insurance on it.
cheers,
Michael