Be sure do turn over every stone on this property. Make some calls, get estimates on the flood insurance etc etc. Three units means 3x's the amount of possible issues.... 3 tenants, 3 kitchens full of appliances, 3 bathrooms where water can raise issues etc etc. Not saying this couldn't be a good opportunity but you don't want 3x's the headaches either.
First red flag, why has this property been on the market that long in this current housing market???
Second red flag, prior flood damage, hidden dry rot, mildew etc???
Third red flag....you fill in this one???
In spite of all that the numbers look good. So that would peak my interest in it too, but due diligence is critical here!