The same for the guys who talks about all the units he controls (when its really a company you work for...owned by a number of people you've never met). 

Commercial lending doesnt have rules about unsecured funds use (credit cards, personal lines, etc) that residential agency financing has (fannie/freddie 1-4 unit).So where you obtain funds to consummate your equity (down payment) of your transaction is more flexible.Its one of the reasons to build a business that has a good credit rating so you can obtain money to build your real estate holdings. 

I recently found a property on Zillow that looks to be in good condition (built 1940s) and has a finished basement that could be rented out as a Mother-In-Law unit (separate entrance, kitchen, and bathroom) while my partner and I live upstairs.

what I was thinking I can do is move my family into the empty unit after the lease is up and attempt to furnish the unit I live in currently ...

When you say multifamily are you talking about small(residential 2-4 units) multifamily or larger properties? 

I just finished my largest and most expensive rehab to date (and my first to go way over budget, 123 year old units can get expensive to rehab).  

Investment Info:Small multi-family (2-4 units) buy & hold investment.

I can track down a few property managers pretty quick and know some 40+ units for sale if you are looking that big (use reddfin). 

Are all the units vacant?

If you notice my posting history I am investigating purchasing my first condo in the next few months and am investigating some potential scenarios.I am looking into living in the unit for a little over 1 year and putting it up for rent either with HCV/Section 8 or finding a tenant through my brokerage(L&F) or other means.