The problem is, everybody puts together deals they think are good, but in my experience as a lead underwriter, asset manager, and now fund manager, I throw out 99% of deals that are put in front of me.Listen to podcasts about passive investments and how to conduct due diligence as an LP. 

It is usually allowable up to 6 - 12 months after the purchase. 3.Buildings are determined as commercial or residential based on the official cadastral category by the local council.4.Commercial mortgage LTV Max 60% depending on the specifics. 5.Not an issue using foreign income for affordability calculations if salary is taken into account. 6.Property valuation is conducted by a valuation company requested by the bank. 7.Residential mortgages can be up to around 80% LTV depending on affordability. 8.

Ask yourself, if they're exhibiting this behavior now how will they conduct themselves once they become a tenant?

Maybe.The other issue is that the adherents, or maybe more appropriately zealots, have no clue as to how to conduct a due diligence review of an investment program.  

It is defined in terms of actions which would not be acceptable to any fair and honest man, or conduct which is monstrously harsh and shocking to the conscience.

For the turn Key program, Dmitri insisted that I would need to pay an up front fee of 10K per property that I intended to purchase through their program before they'd ever send me deals upon which I could conduct my due diligence. 

Windows would be my next check-point (less than R1) and then wall insulation: I would not be surprised if they have no insulation inside, but you can do blow-in, which only requires a small hole.A home looses heat in two ways: heat conduction (which you can slow down with insulation) and drafts, which in old houses is usually the biggest culprit.

Get familiar with the laws in the state you will conduct business in.

Once you have more than enough cash flow and it's stable, that's when I would start conducting wealth-building activities such as purchasing long-term buy-and-holds.This is something I'm passionate about because I see people (including myself back in 2019) buying into the passive income / retire early from rental properties rheteroric and it's just not a thing for 99.9% of people (some find a way to make it work).This is just my opinion.

However, if you've picked up on signs of potentially problematic behavior during your interactions, you might be able to highlight them by adding “good tenant conduct” to your list of standards.