There is more to the formula on how much you can bring in, assuming you're self-employed.If you're an S-Corp, you can do the 23k as an employEE, then an additional 25% of your salary on top of that, with a maximum of $69k total. 

Just a few additional words of encouragement.

3.Additional Fees: Are there other fees I should consider, such as maintenance coordination, lease renewal fees, or vacancy fees?

That is an extremely difficult accomplishment in the near-term.

If you are buying a 2 unit building, especially if you are planning to buy additional investment real estate your best bet is to work directly with the smaller banks/credit unions in your community if that's where you are purchasing or in the area where you plan to buy.

Unexpected Costs: Real estate has a lot of additional costs that aren’t always obvious.

Holds you accountable to accomplish task and the group is a wealth of knowledge.

Many never bother to even get their licenses.A couple additional pros and cons:1.

@Albert Bui @Carlos Valencia There is no offset when you live in the 2-4 unit remember its a full HIt to your monthly PITIA and yes you can use the rental income but only as an addition to your qualifying income, you're still taking a FULL hit on the PITIA.Its only offset when you vacate or move out or it has already been converted to a rental (pure investment/non owner property). 

@Greg Hammond If you decide the property is no longer worth holding on to and you decide to sell, in addition to the capital gains you want to consider depreciation recapture as well as any closing costs and commissions.