It's unique in size and structure for the area.How much time and money would it take to get this changed to a legal 4plex, if at all possible?

I bet that most people looking to move are also looking for a move-in ready house, not a semi-move-in ready house.The market value is $20,000.What should be my asking price if I make all the renovations?

Multi-family is good in concept, but carries more risk (repairs, tenants, scalable size etc).  

Its important though to not just look at the last year, as the small sample size could give you the wrong impression on the turnover rate.

I am willing to bet because you asked fortune builders is not your route.

I'll be experimenting with the average loan size at first, until I can get a handle on how much effort each loan requires to originate.

Determine what size in that niche you are focusing on for product type and sales price.3.

Appraisers really do not consider the nature of the rehab on homes like this, rather they are looking at price per sq ft, year built, size, etc.  

They are much different than SFH and are analyzed differently, depending on the size.  

Homes with ARV's under $300k are going to move fast and are probably your best bet.