8, 9 or 10 foot ceilingsSolid or hollow core doors? 

(this was my estimate with input from the realtor who apparently does demo on the side)- All new flooring (combination of carpet, laminate, vinyl)- All new interior doors and hardware (6 panel hollow)- New (matching) light fixtures- Most or all new interior trim- New counter tops with modification to remove partial wall and add breakfast bar to open space between kitchen and dining room- Refinish existing cabinets- New bathroom fixtures (vanity, sink, toilet, tub) in both bathrooms- Likely sub-floor repair due to the significant amount of pet damageThe major areas that I didn't look closely at (because of the pile of junk in the way) but would certainly need to if I was considering this include the mechanicals (AC compressor appeared original), septic system, well, a closer look at the roof, and a closer look at the deck. 

I already did the demo so currently the whole wall is hollow.

If you are willing to go outside Salt Lake you may try some condos at Wolf Creek or or Moose Hollow in Eden.  

If my daughter came home with an A in cutting up frogs and doesn't even know what a boy is i might steer her to medical school.

I thought about if for a minute and remembered all of the straw purchases I have witnessed and all of the inner city people smelling of alcohol and drugs buying "hollow points" in a caliber they did not know because they bought the gun loaded (usually some obsolete round like .32 ACP or something strange like .327 magnum).

The sound would transmit through the hollow pipe to another mouth piece on the second floor.

Bottom line it is possible but you have to kiss a lot of frogs to find a keeper.

There were even hollow core exterior doors, very inefficient.

The asbestos fiber is hollow and will lodge on the wall of the lung.