I build homes in Dallas TX which is notorious for poor soil which in turn leads to many foundation issues.

Stairs add an extra $10-$13 per step plus Sq ft and 30% waste.ENTRY LVP / Laminate: $7.85/Sq ft with vapor barrier underneath.

Online research points to 'filtration soiling' and it seems to be somewhat common down here (NC).

Subterranean termites need to be killed where they live, in the ground.Remember that wet soil will also attract termites - so look for pipes leaking and plants/mulch that stay wet close to the building.In Florida, a wooden building that hasn't been treated for termites recently... has termites.

so if soil changes, you can just tweek the piers? 

In Texas, foundations are always an issue with the sandy soil.

Anyone selling mobiles similar to vehicle with lien on the titleSo if they didn't pay it would be a repo and not a forclosure And selling the land underneath as a separate rent to own?

You would be better served to collect quotes from a handful of foundation specialists then choose one.As for costs, it will be dependant on many factors: type of foundation; type of soil/rock; depth of underpinning / ease of soil removal; and your location.

As long as it is a cash flowing property that doesn't have too many problems(plumbing issues, a major foundation issue(all houses settle over time, but some house are built on very poor soil), and as long as you don't have issues finding new renters(takes months and months).  

Townhomes usually are defined by controlling the land underneath the property.