I am not overly-handy (I never owned tools until I bought a duplex) - so far I've done basic electric (installing an outlet, adding a junction box, putting in receptacles, removing breakers, fixing a 3 way switch -- all things an electrician wouldn't touch -- or would charge a couple hundred bucks to do, cost me about 7 dollars - literally), replaced an exterior door, removed rotten siding and put up new siding along with replacing the plywood behind it, re-built the rotten framing of a garage wall, installed a ceiling fan, and just about a thousand other things along the way.

Need a little description preferably photos of exterior and interior.You need to get interest rate, down payment etc.

I would focus on the exterior landscaping and front entry.

If a duplex has been fallen in distress (its probably beyond livable) you can ssume 30k per side plus whatever the exterior needs.

-Fix in the following order, some steps can be combined.    2.1 Foundation    2.2 Roof    2.3 Electrical    2.4 Plumbing    2.5 AC    2.6 Exterior Painting or Siding Work and Windows    2.7 Drywall, Texture Paint.    2.8 Flooring and any tile work.    2.9 Doors, Trims.    2.10 Install all fixtures.    2.11 Install or Refinish Kitchen Cabinets.List and SellRepeat

Many people will have different reasons for buying or Not buying a condo as an investment property, my reason is I have a day job that I won't be leaving so this allows me to invest in RE without having to deal with the complexities of Single family properties, the HOA takes care of all the exterior issues, I cover the interior issues. 

A few of the challenges we had to face on this project were: keeping the historic exterior paint color, white with unique teal trim.

He was sure that this home has no load bearing interior walls after sticking his head in the attic and looking around the interior and exterior of the home for a while. 

Corrected utility billings, implemented conservation efforts, such as replacing all exterior light fixtures, tightened policies and increased curb appeal and remodeled office & interiors.

Pouring concrete or doing exterior stucco isn't impossible, but the right people have to handle the work.