Next question is whether to replace the particle board kitchen cabinets that have been "refinished" a couple times already and might not hold up to being removed and sanded. 

The reason is that in the early 90s, they started using an OSB-type material for the subfloor.Prior to that time, mobile homes were manufactured with particle board floors.

And if asbestos, you don't want to be smashing the flooring up because that is more likely to send the particles airborne ...

Has the subfloor been repaired using OSB or other particle-typed product which can hold a lot of moisture?

That house had old builder cabinets, the sides and backs of which are made out of particle board.

The sediment filter catches all the big particles and keeps them out if the softener; the softener is vital for protecting your plumbing, fixtures, and water heater; the RO system is important if your tenants plan to drink the water (softened water is not all that tasty).

Modeling a real estate investment is not equivalent to modeling the motion of a particle (ie brownian motion).

This isn't true.While they might not be able to access the asbestos directly the covering on pipes and heating units can break off and become airborne.These particles can be moved through the ventilation systems easily.

While you are looking at things to fix, the biggest one I find is lots of soft spots to downright holes in the particle board subfloors. 

@Mindy Jensen I was looking for a thin sheet of wood to put over it .its about 1/4 inch, and the gap from the real wood to the particle board has a bit of a gap, not much but its there...I didn't know the board had a name...would (pun lol) it be near the plywood?