That almost always indicated a running toilet or leaking faucet.  

There is an issue with the tub in the occupied unit - the faucet of the tub leaks when the water is on and the leak hits right where the tub and wall tile meet, and of course there is no grout / sealant between the tub and wall tile so the leak goes directly below the tub.  

There's also possibility of replacing the faucet.

I am looking for smoking inside, making sure the electrical outlets are covered, dripping faucets among others.

that the faucet in the tub drips and I can't make it stop.He actually hemmed and hawed because it means turing off the water to the entire building (50+ units), so he's going to wait until he has a few that need to be fixed.  

If the tenant in unit B simply turns the hot water on and lets it run on full from every faucet for the next 60 days who is going to pay for it?

But once you get the HVAC humming, new or newer appliances, toilets, faucets, undersink plumbing, etc..

For instance, if every time you come, you say, "While I'm here, I'd like to check all the faucets and toilets and outlets again, just to be thorough... and I might as well also test the smoke detector battieries while I'm here...and can you turn on the stove for me to be sure it's heating, and all the burners, and are all the windows opening?????

The sink and faucet we kept as it made sense.New kitchen:In the picture you can see the base shoe from the bedrooms and living room. 

Under $100k condo/under $1000 monthly rent, I use HD WilsonArt Laminate counters, re face cabinets with white raised panel (Google local refacing companies not national companies), new brushed nickel faucets, new white appliances if needed, tile bathroom floor and tub surround, new vanity, new light fixtures and new toilet if necessary.