You might just have the scrape/wipe the walls, repair a little drywall and paint some areas.I had a tenant set my kitchen on fire in one of my rentals once and it didn't turn out to be that bad. 

I wanted to get rid of some window air units and wall gas heaters in a unit but can't afford central heat n air units.

We get forced equity through fixing cheap fixes that turn people off (bad wall color etc) and going through the short sale process (5-15% cheaper)!

There are improvements on the neighboring vacant lot (paving, retaining walls) to facilitate parking.

So go for it but just realize you are throwing sh*t against the wall to see if it sticks.Again nothing wrong with that, that is pretty much my business model

I just picked one up in Bartlett, its my first "attached house" although its not a duplex it shares a common wall.

It's bad enough to open a wall up to fix electrical but that's worse if you have to do lead abatement to put the wall back.

I know these questions are pretty off the wall, but I am very confused as you may be able to see.

It stains the walls and molding and also clogs air vents.

What are the replacement options for that without having to rip open walls on the floors below them, etc.