An unknown number of brown long-eared and common pipistrelle bats are living in disused buildings on the site.

BBC: Pipistrelle bat

Bats are one of the most common animals that transmit rabies in the United States, along with raccoons, skunks, foxes and coyotes.

CNN: Are rabies shots needed for any bat exposure?

Wild animals -- especially bats -- are by far the most common cause of rabies exposure in the U.S. Bat bites, which typically occur when a person finds a bat in his home and tries to shoo it out, are responsible for 80% of cases in which the vaccine is given, Willoughby says.

CNN: Four shots enough to ward off rabies