I moved from a house on city water to a house with a well, and have discovered there were many things that I didn’t know that I didn’t know.

But that's a challenge too, as I discovered the owner lives on the mainland, and is quite elderly (living with one of the children). 

Shortly after buying our first house; I discovered BP Money (HEY!

Mine: We would be glad to conduct an inspection with you present, before move out, but understand it will not be "official" and that a "post move out" inspection will be done within 3-4 days after move out, and things may be discovered that weren't discovered in the original inspection "pre moveout". 

However upon entering the apartment after it was completely vacant and keys were turned in we discovered NUMEROUS damages that had been hidden.

You have discovered that capex is not a linear occurrence.

Two days late, the agent carried out a spot check on the property discovering a massive water leak because of what appeared to be a faulty diverter. 

You can use this tool to discover info on the exact area. https://www.richblockspoorbloc... also look up the amenities and crime rate in the area.

I was doing some SFR flips, BRRRR and even some private lending before discovering the awesomeness of MF.

@Marty Hyland personally I would put a due diligence clause in the contract that gives you an out if you later discover liens.