It made it super easy to see the difference in pricing and I ended up saving a decent amount.

However if you plan on buying 3-4units, there is a trigger rule for FHA, it is called the self sufficiency test.

A big one with a ton of information regarding the process of brokerage/law/national law/etc, and a small book of Rules and Regulations directly out of the State Legislature.STUDY THE SMALL BOOK AND UNDERSTAND IT BACKWARD AND FORWARDIf, during the class, they tell you about certain statutes in that book, highlight them and revisit them.

Usually an Architect would do this.However, it is pretty easy for residential.

Neither will work for STR - condos due to HOA rules, and bad locations due to, you know, being in bad locations.

Once you get the majority of the rents to market value, you can refinance out to a DSCR commercial loan that never falls under the fannie mae rules. 

Sometimes, different lenders have different rules or ways of doing things, so it might be worth shopping around a bit.

Do the rules for eviction give any advantage to the owner, if the owner also occupies the duplex at the time of the eviction ?

This is easy in some markets where properties are in the 6 digit range, much harder here in the BA.I wish you the best of luck!

The 78% rule applied to conventional mortgages.