It is possible your building has concrete cancer (or spalling - which is just another word the industry uses for the same thing) if you see any of the following:
See photo gallery below with examples.
What you can't see unfortunately, may be the spread of the "cancer" (spalling) throughout the concrete.
It will continue to spread if left untreated, but please don't panic,
we can help you.
Exposed, rusting steel - Concrete Cancer