However, that was long ago before the (internet) in a specialized environment.

As a long-time Contractor, Investor, Home Inspector, and more, here is my take....Those pipes are past their 'expected life span'.

For example, this deal does not seem to "fit" based on the 70% rule calculator which was new to us.3.Any suggestions on how we could negotiate better terms with either the bank or real estate agents?

I am looking into the STR and STR/bonus appreciation strategy as a way to offset W2/short term income.

I have many long term renters that have been in the homes paying on time, so my question has to do with increasing rents for existing good long term renters.I don't want to lose good renters.

Our market is very heavy tourists, so a lot of individually owned STR condos, but honestly I've personally have had more success in long-term rentals doing the BRRRR strategy with small multi-families and B-Class SFR's. 

It measures investment performance and helps in determining the property’s value.

Could I have assigned it to a different buyer once the original buyer had broke the terms of our agreement? 

They're for the long-term hold with the 30 year note.

If you want to buy and hold (eg long term rental) and you aren't planning on living in it, you will need 20% down.