However, another factor was that the septic tank was shared with the neighbor and there were no written agreements in place as to who was responsible for expenses.

Want to buy an old commercial building or gas station that had leaking PERC or leaking gas tanks? 

Agree on the advice their are sharks out there that are very good praying on people with various scams each month a new one pops up so avoid the housing market right now .In the mean time invest in a index fund that follows a benchmark like a S&P 500 each month/week put more money in when you are at a age that father wisdom has visited make small moves into the housing market .

A bad cleaner that is not paid well would tank your revenue so I think it's a blessing to have a well-paid and amazing cleaning team. 

Subchapter D of Chapter 5 of the Texas Property Code@Ryan Mcpherson  Stay away from Sub2 Sharks. 

Bonus is I am getting new HVAC, Furnace and hot water tank. 

It may be helpful:I can give you some general info on insuring the property:Here are some things to look for from an Insurance prospective:1.Any in-ground tanks (active or inactive)2.Any Knob & Tube or Aluminum Wiring3.If built before 1978, does the building have Lead Safe certifications4.Any wood stoves or secondary heating units.

(You should see pink antifreeze in the toilet bowl and tank)

If you don't care about income and are more of a capital gain kind of guy, prices are already high (as you noticed) and there's plenty of land available to buy so I'm not sure how much is left in the tank.

I would be leery of an product or service being promoted that has zero negative reviews.A 1-star review is often not realistic and will tank the algorithm in your first year for sure because it's not balanced out yet.