If you have siding they'll crawl underneath it.

Each address has several lines underneath for entries for payment of rent, our PITI payments (broken down), repairs and expenses (the lines are easily added to with the right-click insert option, and they have columns for the date of the entry, notes about the entry and the amount). 

Even the stage one soil sampling comes back clean now, there's no guarantee there won't be any leak in future.  

After purchasing - we discovered there was contamination over the state thresholds - which required additional studies (soil vapor, etc).

One example the bathrooms costed 3x more than I guessed/assumed (also had to replace most of the plumbing underneath the house).

But in general, some examples could be poor exterior grading, soil types, issues with gutters or drainage, freezing/thaw cycles, poor construction, deteriorated components to name a few.

It’s on their contract they should keep the thermostat temp at 72, anything lower than that could cause it to freeze therefore costing them hundreds of dollars and trust me prior to having notes underneath of it n to have mentioned it on the contract it did cost me hundreds of dollars to fix it!

My plan was to put laminate down, but when looking up from underneath, it appears there's hardwood there that I am hoping I can refinish.  

In theory, if I claim 100% of the cost basis as the price we paid for the apartment, the IRS could make the argument that there has just got to be SOME land underneath that apartment somewhere, and therefore I must have some part of it.

I have an irrigation system at my house , its sandy soil and PVC pipe  4 to 6 inches in the ground .