Duplex with carriage house

[Michael Faurest]

Hi, I have experience with single family homes and turnkey out of state properties.  I just put an offer on a duplex with a carriage house for $175,000.  The total rent between all units is about $2200 to $2400 per month.  The house was built in 1900.  I don't know yet about the upgrades or renovations as I'm starting due diligence.  Using the 50% rule, it nets about $125 to $150 per unit with a conventional mortgage.  This is my first duplex/triplex and I don't know what else I should be considering.  All units are good sizes in a decent area.  Do you think this is a good deal from the little info I have provided?  Thanks.