Thick above the ceiling and blown into walls between studs (which settled and was nearly useless).Terrible openings ALL OVER letting air in and out.We replaced the gas water heater with electric to avoid venting issues.BUDGET was 35k for both apartments.  

You get lied to, have to chase payments, cheat, steal... the whole 9 yards... and deal with normal evictions, and see how quick you want to fix stuff, it's a whole different animal.. but it's a need in the  market, takes  really thick skin though.Just a thought with the neighbor, give her your contact information, and tell her if there's ever any problems to contact you!   

This is not for newbies, or the faint of heart, dealing in these areas requires a very thick skin and is an acquired taste.

@Kurt F.Too long to mess with.I agree with the installation of overlay thickness gyp bd., as suggested by others.   

I am tempted to use that composite material that lasts forever with virtually no maintenance, but that stuff is often 1" thick and requires joists 12" on center to support them at a 45 degree angle (my current plan calls for the joists at 16" OC).

Within a minute of starting the job, the dust was so thick I could not see more than a few feet.

Being a buy and hold investor takes thick skin, I'm learning that everyday.

Replace old carpet with new but use very thick padding2.

There are tons out there with great methods on how to figure out how many jack studs are needed and how thick a header needs to be.

That could be new shimming or sanding/cutting some thickness off the door.