I would suggest paying a contractor for a couple hours of his time to come and walk through with you to give a ballpark unwritten estimate for repairs. 

Get a contractor over there to give you an estimate so you can use in your analysis.

So here are my rough numbers.Purchase Price 90KFinish rehab est. 10KARV                      130KTaxes                     900Ins  est                   600W/S/G  est             1000Rents est              1600-1700Questions:1  what should I estimate for repairs/cap ex on a rehabed 100 year old duplex?

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.

Security deposits are not a Landlord's possession until a tenant literally damages the place is inspected by a professional contractor or handyman write you out a repairs estimate.

They often under estimate vacancies. 

So seller is about $110k high in your estimation.

Verify that the reference list is estimated close to the size and type of your portfolio. 

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.