There should be permit records with a site plan showing the location of the septic tank as well as the rest of the system.

What I have going for me - a Class A Contractor’s license, a healthy W2 salary (I’m an engineer at a “think tank”), a little bit of experience, and about $25k or so in the bank for my next investment.  

The sealed chamber with the intake on the bottom is a TERRIBLE design and causes problems like this all the time, some of the units are now coming with a wrap around screen for the base of the tank as a first line of dust defense.

You might ask the Realtor for the bank if they have any cost estimates for dealing with the tank.   A

I’d have the seller remove the tank as part of the contract.

I've seen others treat a hot water tank as an appliance?

The hot water tanks are gas (2 units share one tank), as is the furnace.

Price should include empytying the septic tank (if applicable) and collapse/abandonment of the tank (a legal requirement).Have them cure any permit defects/violations at no additional cost prior to them receiving final payment.

One bad day could potentially tank a stock.

Mind you, if interest rates were ever to return to a normal level in the US or Canada (something like around 6%), the property market would inevitably tank as it did in 2007-8 as the CAP rates are generally currently below that interest rate level.Short-term rentals work great in Mexico because of much lower property prices, operational costs and taxes, potentially higher income and no (danger of) unfavourable short-term regulations.BiggerPockets is awesome but it's mostly US-centric and you cannot copy/paste everything when investing in another country.