The good smoke detectors are expensive.

Other then that, most of the time you’ll just need the Carbon/smoke detectors and fire extinguisher.

They chew tobacco in their sleep and have neck tats.

& utilities for 3-4 guys with jobs and no pets or smoking.

Anyone have experience using an ozone generator for removing fire smoke smell?

@Greg Parker Do you not require that of the tenants in the lease, similar to light bulbs, smoke detector batteries etc...?

Would I be able to paint the ceiling with dewaxed shellac to cover the smoke stain ,(and smell) without cleaning?

Cigarette smoking caused the fire. 

The tenants who live in the unit next to mine complained of an odor that smells like stale cigarette smoke in their apartment.

Also, depending on when the panel was installed it may need to be upgraded so that it accepts AFCI which is now required in all bedrooms and smoke alarms as well per NEC2017.But, I got wildly different quotes when I set it out to bid.