But the situation did get me to start thinking on how to properly analyze a small multifamily house.I've only invested in SFRs so I'm a little green when it comes to properly analyzing a duplex.

@Jonathan Greene, I agree for the most part.  

Additionally, you may not be able to get multiple meters to a SFR without violating zoning and building codes.Go green

If the household income cannot keep up with sales prices, it's very hard to get a green light to increase supply.

Now if there is a bar, restaurant, retail, or other commercial use and its legal, then it could be considered commercial from a lending standpoint.  

@Min Zhang, I did read David Greene's "Long-Distance Real Estate Investing" and am using it as my primary guide.

Quote from @Jonathan Greene: Welcome.

@Butch Greene, your issue isn't about buying it at all.

A handy search bar in the upper right makes it easy to find previous discussions, blogs, podcasts, and other resources.

Quote from @Josh Green: I personally am buying and helping clients buy in the Tampa Bay Area for a few reasons:Here, you have a historically strong and consistent tourism presence, limited land/STR allowable areas, highly liquid property compared to selling a cabin in the woods, all 9 classes of visitors in the STR sector, and appreciation.