You need multiple tenants in a non conforming duplex triplex to have a glimmer of hope and this includes what you mentioned "over spend on renos and rehab".  

Financing was received through a local bank, utilizing a non-conforming portfolio loan.

This would be much less true if they had to conform to Fannie Mae or Freddie Mac guidelines, and to a degree, Dodd-Frank.Active flippers, for example, are in constant need of cash and often prefer to pay everything when they sell a property.

If it is grandfathered in as a 2 unit coach house a major alteration of that could have voided that status so it may need to be rebuilt as it's new conforming status 

If these are conforming loans that are sold to Fannie Mae, that's not a worry.

We put a lot of money in the short time we lived there--tankless water heater, egress window to make the basement bedroom conforming, bamboo flooring in the basement, a privacy fence around the entire backyard, backyard landscaping, and other smaller improvements.

Hey everybody,My question is how do you secure financing after your fourth conforming loan with a bank?

I think I fixed it, but I’m working on a 2 flat with a non-conforming basement unit due to the area being down-zoned.

Hey @Jimmy Smith,The best renovation/rehab loan product on the "conventional" / "government" market right now is FNMA's HomeStyle program, which will let you borrow up to 97% (ARV or total cost) up to the conforming limit ($484,350 in most places for 2019).

I found a multifamily home that is listed as 3 Units, but it states that there are 2 additional non conforming rental units, for a total of 5 on the property.