I wouldn't do it, the property is overpriced.
A duplex is an asset, meaning that it should make you money. If you're cashflow negative, then its not making you money. Even if you're okay with that, you'll have a tough time unloading it when the time comes because investors want to make money.
This one costs too much, move on and find another property.
Alternatively, you could do the math and figure out what it SHOULD cost and make an offer. That's how I got my place. There were 6 duplexes on the market that I would want to own, but they were all overpriced. I did the math on what I thought they should be worth and make 6 offers on the same day. I got turned down 4 times, but 2 of them countered and I went with the one that had the most reasonable counter offer.