Thank you for your concern. This issue has been received by our department and is under investigation.

Looks like it could be fireblight, a bacterial tree infection that often strikes Callery Pears. I might also suggest that the soil pH could be off, but the other vegetation looks like it's doing well, so I'm leaning more towards a disease of the tree.

Thank you for the feedback, very helpful. After reading up about fireblight online, I think you are absolutely correct. Most likely a goner.

The city forester has inspected this tree and will continue to monitor its health.