Utility bills, rental lease agreements, paychecks with home address, address on IRS returns past 5, 1099 and w-2 mail to address, USPS mail records ... are what you need if you push the limit and get audited.

You maybe already figured out an approach that works for you... but you could check out this Rookie Reply podcast episode that addresses this question.  

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Fresh out of college and I'm looking to get my skin in the game in residential real estate investing.

They have more skin in the game then you do.Make sure you get clear title.

@Tony Clark, I agree w @Bjorn Ahlblad regarding which tenants to address first. 

So it is almost like operating a duplex in the skin of a SFH.Last thing- CHECK OUT THE BANK OF AMERICA GRANT PROGRAM!!!

We already know what the property is worth as soon as you send us the address.

Second, your solution, namely, Section 8 or rental assistance, is one of the best ways to alleviate homelessness, and does so far better than rent control over time because it addresses the legit. needs of both sides.   

Now, addressing the "is it a good investment" question:  Who knows.