All investors need to learn the GIS and other mapping applications intimately, the overlays show things like Zoning, Flood maps, Soil types, Topo, and much much more, all at your finger tips 24/7 I never take anyone's word for anything, especially from a government office, even before the GIS  was wide spread I would go to the county offices and read the maps myself,  Do your own homework and dont rely on others,  same reason I learned abstracting, understanding more than most will get you farther than most, best of luck.

Yes, I am aware that underneath may be a different story.

Just kidding, I’m selling a lot right now and the buyer asked for the following contingencies:1) that the HOA CC&Rs don’t change during the closing (seems very unlikely to me)2) that the lot is a legal buildable lot (I’m ok with it because I check this during my due diligence phase when I buy it, and honestly he should confirm this before putting it under contract, but it doesn’t bother me because I already know that it is)3) that the property passes a perc test (this means that the soil is acceptable to sustain a septic system, again I’m ok with this based on my due diligence I can’t foresee it not passing a perc test, and it’s a reasonable request from a buyer.

Not necessary on the main floor if there is no living space underneath that would be affected by noise.

An area where the soil is very compact? 

My view of your description is that the S-LLC is almost like an umbrella and all the LLC's(Properties) are underneath.

they can test the soil for drainage quality for the septic system. 

Foundation companies are in every neighborhood daily - but many homeowners/investors have found that there are many anchoring options that are effective as long as the drainage/soil are addressed first. 

These chemicals and pesticides leach into our soils and water along with drifting over in the air for miles. 

Should I first write one paragraph in english and underneath the paragraph translate in spanish or should I have one side of the page in english and other side of page translated in Spanish?