Possibly a 2nd attorney if the prior contractor (if improper work caused the issue) or the city (failure to maintain or test the pipes) to be sued.  

@Peter Koch, I agree that a PM may not want to actually link the accounts with two way traffic, but there are APIs (I don't know if Appfolio and Quickbooks have the appropriate ones) that allow for data from one software to be pushed into another, without the second being able to access or write to the first.

Just look a the data surrounding the market.

Deep clean the apartment and then invite the lead inspector in to test it.

Best way to get long term rental $ amount data?

I am also running a property management company so we have a ton of data on returns.  

Ensure to look at factors with aid growth and also look at the supply data for the area.

Or is it hidden in data online?

Dwellsy's data shows that single family rental prices are up by 15%, driving an overall increase in median rent by 9.6%.

He will probably want to wet test the pan.