Depends on how much repiping you have to do Inside the duplex, which depends on how the existing water pipes are run.

.- Building materials - type of pipe, type of electric wire, type of shingle and type of roof sheathing underneath the shingles, sheetrock or plaster walls. 

There is a cleanout (pvc) fairly close to where the pipe exits the basement.There are no tree roots from here to the street.

Well, just yesterday my husband was over there with a plumber fixing some piping that caused some backup and the guy tenant said to my husband that he hates his roommate so much that it wouldn't take anything for him to just kill her. 

The second one, there are 2 gas boilers and 3 water heaters running their exhaust through it.

Lots of pre 80's property which means aluminum wiring, galvanized pipe, and poor insulation.  

Demo kitchen, install cabinets, install countertop, kitchen electric, kitchen lights, kitchen plumbing (including saw cutting cement to run water pipes and electric).5.

I am new to Real Estate Investing and am so exhausted from all the seminars and books, and programs and have never been more confused.

Here is what we are doing...Re key home to make new tenant keysClean up and shape the landscaping and trim tree in rear of homeRepair exterior wood - Repaint all exterior siding and trim.Repair gate / fence leading into backyardReplace all kitchen cabinets with new cabinets - Paint white, then antiqueNew st steel stove, dishwasher, and vent a hoodNew countertops (kitchen)New wood laminate flooring in 2 living areas and hallway - 1st floorNew tile floor in downstairs bathroomNew vanity and sink in downstairs bathroomTile walls around tub to replace old tub surroundNew brushed nickel light fixtures and fans throughout the homeNew carpet and pad on stairs and upstairs hall and bedroomsNew tile floor in upstairs bathroomNew vanity and sink in upstairs bathroomTile walls around tub to replace old tub surround upstairs bathReplace old / damaged sheetrock where needed (mostly downstairs)Repaint all ceilings throughout homeRepaint all doors and trim throughout the homeRemove all wallpaper and paint all walls standard neutral colorsReplace all interior and exterior doorknobs and looks to new brushed nickel look to match lights and fansReplace all cabinet pulls and knobs with brushed nickel to match door knobs and lights/fansLicenced plumber to repair and service all plumbing fixtures / pipes to ensure no leaksLicensed HVAC technician coming to service and clean the heat and air to ensure it is working property."

Maybe he can pipe in?