4 plex with Flat roof.

[Mark Bushong]

I have been searching for deals on small multi family units in my area (Tri cities, MI) I recently found a 4 plex that is listed rather cheap and has a flat roof. I'm thinking this is part of the reason for the low price and long time sitting on the market. Before I spend a lot of time and effort performing more due diligence on this property, has anyone else dealt with a flat roof before? I am wondering if it would be cheaper long term to have it converted to a normal roof or if a typical flat roof replacement would be better. I am betting based on google earth images that the roof is in need of replacement soon. (Although that is not for certain) Anyone with any experience in this area?