You will also have to find out if it conforming or not.

For house hack you'll be using a conventional conforming loan.

If you are not going to occupy the property, the question then becomes do you go with a conforming loan or DSCR.

I bought a SFH, lived in the basement in the non-conforming bedroom, and rented out the main bedrooms to friends.

In the past there have been limits on this likes "Super Conforming" loans and staying under that amount (or under a "Jumbo" classification) can get you a lower interest rate. 

You can have what is called a Legal Non-Conforming property, which means it is legal but zoning is out of code (in Chicago, many areas have been rezoned R-1 SFH yet can still be a multi family property).

You also need to personally qualify for the payments and none of the current income from the property can be used (less than 2 years history on your taxes).Commercial will be a higher interest rate (usually not significantly .25-.5%), shorter amortization (20-25 years) but don't have to conform to investor guidelines as they are often bank held/portfolio loans.

@Leron Horn - The purpose of portfolio loans is that they don't have to meet current FNMA guidelines for conforming loans - so each bank sets their own guidelines when keeping loans on the books.FNMA guidelines stipulate that you don't have to be employed at your current job for 2 years, but you have to be employed in the same type of position / industry for 2 years.  

If $453,100 is the conforming loan limit for a SFR in that area, then the limit for a fourplex is $871,450.

You then can get an owner occupied conforming loan with as little as 3.5% down in "A" paper pricing.