As far as financing, a 4-plex is considered a 'conforming' loan - like a single family house, so you should be able to use your good credit to get a decent financing rate.  

With your savings you will probably fit in the square box of a conforming loan of some kind for the first one.

The insurance company has just come back to us this week saying they are considering cancelling our coverage due to a list of non conforming items; most of which we already have, or are in the process of fixing.One of the issues was a neglected tree which had large tree limbs resting on the roof of the detached garage.

Different rules apply to refinancing as costs can be covered by a note holder or originator, offering much better terms down the road at a very low cost usually motivates borrowers to refinance so a balloon is not really needed in many cases.What ever is done on the more creative side, it's clear that it needs to conform to prudent lending practices, be consumer oriented and compliant, but it's possible to do business, it just needs to be restructured from what has been done in the past.I'd say too, beware of gurus jumping on such ploys, don't even think of going there. :)

In addition to do they allow subletting, you need to find out if it's a 55+ park, if the home conforms to rules about condition and appearance, etc.Once you have all that information and you decide that renting a home is possible and may be feasible, then you need to determine the rents that you can get over and above the lot rent.Then buying a mobile home is more like buying a car.

The essence of what we learned was that it was MUCH more realistic to fight the battle to build a new ADU than it was to try to get one to conform to new, ever-evolving, standards.  

Most lenders will want to conform with Fannie/Freddie guidelines, which will put the max LTV at 70% for a cash out refi, investor loan. 

I would agree with @Albert Buithat outside of conforming loans, your best options are commercial lenders, community banks and portfolio lenders.

It is a non-conforming note. 

Better to call it as the bank sees it; as non-owner occupied, non-conforming, 1-4 family underwriting.