Barn swallow nest in underground parking garage

Yesterday when Kim was here helping me back she was fascinated by all the birds  that were flying around and nesting in my underground parking garage. Now keep in mind that to me, the uneducated, they were just noisy birds. She told me they were. Barn swallows and she could see some baby birds in the nest. This is a picture of the nest. Of course they built right on top of the sprinkler systems so if the building catches fire we may have to sue the birds. :)