Everything is a mess underneath."

Quote from @Don Miller: The following is not to express any level of happiness or unhappiness with the build:Received change orders totaling $14,970 for 18 additional loads of fill dirt over allotted amount in contract (fill dirt arrived in December 2022), 7 loads of septic sand over allotted amount, and rock excavation at the septic site. make sure to ask for the tickets. if they are putting 6 yards of soil in a single axle truck you are getting ripped off.

Sometimes a sewage line will sag over time due to settling of the surrounding soil.

Some questions I would want to answer: Has anything changed in the surrounding soil recently? 

If you use a urinal at a Cleveland Cavaliers game go ahead and place a business card on top of the urinal.Wear a name tag everywhere you goGet a name tag that says Realtor with your name underneath it.

If your house is not build on soil like that, but instead is built on more stable soil types, you probably will have fewer issues as long as the foundation was built properly to begin with.

Beyond the bedrock issue, soil conditions can be costly if the property has problematic soils such as too much silt, deep topsoil, or extensive wetlands.You'll also want to know what ordinances are going to affect your budget - things like tap fees, tree ordinances, storm water retention policies, etc.Bottom line is that you have to investigate ordinances, off-site conditions, and on-site conditions before you can even begin to budget your development.

Typically with houses of this age - you'll need structural folks to dig and install piers into the soil.

Why would someone invest when they can invest in a REIT or other fund where they own shares and thus own the ground behind it.Its like the idea where people want to sell a home but not the ground underneath it and in 30 years take it back but not be responsible for anything during that time (yes you can do this commercially but not residentially). 

Hence the list of rather uglies that tarnish what is really awesome underneath.