Cinder block walls IMO looks extremely cheap and screams low income.  

If you have lights that hang from the walls (not ceilings) and baseboard located plugs, it may (no guarantee) be an indicator that there is knob and tube.

Siding, Windows & doors, trim paint) Interiors typically work from the basement up in this sequence - DemoMEP- Mechanical Electrical Plumbing rough in Insulation and air sealing Drywall hanging / taping and finishing Paint or wall finishes Finish flooring / tile, hardwoodsCabinetry / casework / wall tile in kitchens and baths Interiors doors / baseboard / crown molding / door and window casing Finish plumbing and electrical - also called trim by tradespeople That's it in a nutshell, some may use different sequences but this is a general activity framework.

Perhaps the basement or exterior wall was not sealed correctly after the electric, gas or water was split to be metered per unit. 

If I were living on the other side of the wall from someone who discharged a firearm indoors, I'd have serious concerns about my own safety.

Now let's pretend your tenant stopped paying rent, put some holes in the wall and destroyed the carpet.

There are underground outlets throughout the home, no GFCI in the kitchens or bathrooms, one horizontal crack from floor to ceiling in the first floor with a crack running the width of the room where the wall meets the ceiling, there is a thin stair step crack on the brick exterior (seller claims the issue was repaired).

If there is a detail I need to show- leak, or damage, or whatever, I will then take a wide view that serves to identify the general wall area to identify where in the room, followed by closeups as needed for the detail.

He'd have to demo the sheetrock, put up water proof cement board, and install about 140 sqft of 12x24 tile and frame out 2 stainless steel wall niches.

The other walls of my property are block walls.