The applicant's story was that he vacated the property due to rodent and or bug infestation.

Pest control can sometimes tell where they started based on the level of infestation. $450 for a 4 unit is a screaming good deal for bed bugs.

They say that the property is infested with roaches and rats and unhabitable as a result.1.

My main concerns are finding areas that are not crime infested slums and areas that have a steady rental market.Anyways I look forward meeting new people and growing my business.

The place was completely trashed and rat infested.

And when it comes to group responsibilities, every kid plays the game of "NOT IT".A neglected kitchen situation can quickly turn into a pest infestation. 

If you did that could make sense depending the infestation extent and type of rodents.( mice, squirrels, racoon, etc. ) squirrels do lots of damage.

When it comes to water damage and especially mold, you don't want to take any chances due to health implications and the threat of spread/infestation.

Aside from the normal inspections (wood infestation, foundation, roof, etc) I also like to look at comparable rents in as small of a radius to be statistically significant to ensure when these tenants move out you'll be able to get about the same if not more rent. 

- Is it a massive infestation?