It simply is a corrosive chemical that crawls to wiring and pipe, just like mold did.

The 5th was bought 30 year mortgage from Chemical bank.

I am a chemical engineer. 

If you aren't afraid of the soil or groundwater being contaminated from chemicals that were spilled or dumped onto the land, or disposed of in a septic system, then it sounds like the deal of the century. 

Galvanizing copper is a chemical impossibility.Projected lifespan of galvanized piping is typically projected at 60 years, but it can be less or more depending on the water quality of the source.Copper is generally projected at 80 years but same caveat.Lifespan of plastic is for all practical purposes, infinite. 

Isn't there supposed to be some sort of fire retardant wall between both units? 

Shantel Pilcher, Pilcher Insurance, is my go to gal for insurance.She can take a deal that some call center retard at Liberty Mutual Insurance can't figure out but provided a quote for anyways, and actually do it, and somehow beat Liberty Mutual's price quote, USING LIBERTY MUTUAL. 

I will also have the mold people basically tent my house with thier chemicals.  

Current Situation:  I'm an IT manager in a large chemical corporation that is going through two major mergers this year.

This guys 48 unit building was burned down because 1 tenant was trying to make some kind of drug and did not mix the chemicals right.  3.