New decking is needed if it is rotted out or you have planks under the shingles rather then OSB/plywood.

Zero anything except trash, fridge, oven and dishwasher.I did end up replacing both the oven and the dishwasher, adding a washer/dryer, refinishing the deck, replacing the deck railings and redoing the deck stairs.Almost everything furniture wise was used from Craigslist, used furniture stores and family updating.

With little structural work needed, the $200,000 renovation budget will mostly be dedicated to completely updating the kitchens and bathrooms, refinishing the existing hardwood floors, removing wallpaper and interior painting, replacing windows and repairing the back decks.

My hope would be to transform it into a 4 story, each of the 4 units having 2 Beds & 2 Baths & a common access to a roof deck area. 

Spray that down liberally and there won’t be one blade of grass left after a few days .

A brand new roof down to the decking or they slapped another layer on top?

If you use poured concrete exterior you will need to use either concrete plank floors or steel bar joists and metal deck then concrete over that.

I notice that on wholesaling calculator on this BP, there are section for "estimated repair cost" and under that section, it has Exterior Repairs: Roof, Concrete, Gutters/Soffit/Fascia, Garage, Siding, Landscaping, Exterior Painting, Septic, Decks/Porches, FoundationInterior Repairs: Demo, Sheetrock, Plumbing, Carpentry, Electrical, Interior Painting, HVAC, Cabinets/Countertops, Framing, Flooring, InsulationGeneral Components: Permits, Termites, Mold, MiscellaneousWould this be good enough (complete) list in which I can represent this list with (columns of labor and material costs) to the general contractor and be assured that I would be able to get a good ballpark precise range of estimated repair value that would be valuable to the end buyer/flipper? 

Here is the view from the Balcony Deck outside the bedroom.

A Raised deck to enjoy in your back yard.