Security deposits do not belong to the owner until/unless the tenant leaves and there is damage beyond ordinary wear and tear. 

What @Thomas S. said, plus the fact that if you let them use security for last months, you have nothing for property damage.

Geneva,Couple questions, thoughts: first, why are you picking up electricity/garbage/water in your monthly expenses?

I think the back two units had fire damage.

26 lots, 20 park owned mobile homes, 4 acres. city water and sewer

A oil fired boiler , a water conditioning system , an oil fired hot water heater , a 4 zone mini split  system , 2 sump pumps , a refrigerator and the stove .

Nowadays we have so many resources available so we can dip our toes in the water first before completely diving into an industry.

With that mind...2. the water from the roofline then drops to soil right on the ground used for landscape plants.

Specifically:“The management of the property necessarily involved alterations and repairs…..it was also necessary to furnish elevator service, heat, light and water which required regular and continuous activity and the employment of labor, the buying of material and many other things which come within the definition of business”.

Then you'd have to make sure there is no mold or other water damage that was caused by the leak.