@Dave Wigfield The 203k loan is only if it will be your primary residence. You need to look at a Fannie May Homestyle loan if it is for an investment property. The Homestyle loan is basically the investors version of the 203k which means that the bank will loan you the purchase price plus rehab cost based on their appraised ARV (upto 95% of ARV). Another point of note if you do a Homestyle is that you must use a licensed GC for the renovations.
Side note: I actually went and looked at this place yesterday (or I presume it is the same place). I think your $15k estimate is low. This of course is predicated on what level your are trying to bring it up to but I would advise you to take a second and closer look; maybe run your numbers again. I will admit I am quite conservative when I do mine so I may be a bit higher than others but the numbers I ran versus what you state here are quite far apart. I think the duplex, location, and neighborhood easily hold $650-700 (maybe more) per door once renovated. One last thing, I have even thought if I bought it I would change it back to a 1/1 and 1/1 because that second 'bedroom' on the left side is so incredibly tiny. Just my thoughts!