You also have maintenance issues.....
A sound and well conducted maintenance program has to be in place to secure the property value and return, poor maintenance and lack of needed repairs will only result in minor damages becoming serious problems to the property asset, and they get worse. An abandoned building or property is like dumping your inheritance or lifetime hard earned money down the drain. The issues with damages which are pointed out above, will always exist but with a good scheduled program, or a periodic survey by a professional your asset is secure.