One straight up told me he has no clue, and the other two gave conflicting answers. 

In my market, duplexes sell at a marked discount to single family homes (for comparable size and finish quality, can be 30-40% depending on submarket).  

(So about 4.25%) **NOTE: Anything paid back will be deposited straight back into my 401(k), including interest**Scenario: I would like to leverage this loan and invest into a 1) Syndication deal like a MultiFamily Apartment or 2) A Equity Fund that buys Commercials Multi Family RE. 

Those are likely serious buyers actively scouring the mls for discounts.

Feels like straight up theft!

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Otherwise, use your big heart, give discounts and when you get hit with a huge bill for a roof, plumbing, or furnace you will find your tenants don't give a crap about you even after you discounted their rent for several years.

There are many MFH that share meters and systems.Personally, if this is a house hack or even a straight investment we typically don't go through the effort of rezoning a property as a Multiunit.

Most things got thrown straight into the dumpster, but there was a lot of good stuff there. 

Or asked otherwise, do condo "lots" suffer a discount to the same size fee simple?