Mortgage Broker or Lender, Chicago, IL
I would suggest placing 25% down if this is an investment property (2 unit would most likely be considered). If you were to find a one unit secondary home, 10% down (rates with great credit, around 3.625% today)
We fund second home purchases with a minimum 10%, however, if you are buying a duplex it would be difficult to explain this purchase a second home and not an investment purchase. Our investment loans are a min. 15% however I recommend 20% to avoid MI if possible.