It’s about being smart, skeptical, and a bit of a detective work. 

Everyone else has mentioned the noise but I'd also be worried about water leaking from the top unit into the bottom unit.

The tenants were understandably concentered about the possibility of mold growth resulting from the water intrusion, so I had a test done which detected some mold.

Is it leaking or just unstable?

What happens when the roof starts leaking, the parking lot needs restriped, or the fire system for the center needs a major repair?

The roof is new so shouldn’t have leaks but you never know and would like to know when a problem happens so we can get it fixed without causing more damage because it not addressed can cause more money to fix and further damage. 

it’s all cosmetic. sink basket is sorta leaking, the puddy isn’t holding well. gonna change out the sink basket instead of replacing sink, nothing is wrong with the sink entirely.

Stop the leaks, install window vents and or humidifier I have done dozens of jobs like this. 

We hired a plumber (that we have used for years) to fix a tub spout leak and toilet repair.

They just left a homeowner high and dry, when a personal residence flooded due to a pipe quietly leaking for months!