There were also little white rocks and residue on pretty much every hard surface of the apartment.

The property we purchased had been on the MLS for 80 days and on the surface appeared to be overpriced.

Over painting of all surfaces is needed.

In the level area I put in surface drains as well as a french drain next to the foundation. 

Since the new tenant is a "dentist" , the water and other contaminants to the floor  might make it wise ti go with a commercially rated hard surface for the operating rooms and labs with carpet in the hallway, waiting areas and staff areas; reception, private office.

(Rochester found that painted surface repair lasted an average of 2 yrs before they were peeling again and required to be repainted again. 

Take good care of all painted surfaces.

Frank "Fun" :(   I had the same problem, had talk with neighbor and he didn't do anything until I put a notice warning him "18-29-1101.2.1 Roof drainage and downspouts" that is pull from Code of Ordinances for Chicago.my was basement so I just put fans on and let it dry (summer time).  

@Matt Skog if this has 95 occupied pads and a lot rent of $475 per month then this park is worth closer to 2.75 or 3.0 Million on the surface or more as it sits.  95 Pads * 475 lot rent * 12 months * 0.6 (40% expense ratio) * 10 capitalization rate = ~ 3.25 MMIf you can pick it up for 1 Million then you why not just milk the thing as it sits for the perpetual income, why the redevelopment headache for a one time payoff?  

I'm working on my surface laptop.