A Fish Crow, identified by its vocalizations, patrolling neighboring roofs. For bugs.
Crunchy snacks.
I believe the prey here is a Common Green June Beetle.
Seemed to already dead up there. Crow was scavenging and found several tidbits.
Flashbacks:
Two years ago, Laughing Gulls were swarming over a bunch of these same beetles at Bush Terminal Park.
American Kestrels eat these beetles, too.
Backyard and Beyond 
I always have trouble identifying Fish Crows from American Crows!
I can’t do it visually (there’s something about the primary feathers). But their voices are very different. American Crows have the classic caw-caw. Fish crows are more like egh-egh. It becomes tricky in summer, however, when fledgling American Crows sound somewhat like Fish Crows. This bird, however, was mounting like crazy, lots of gaps in wings, tail, so I thought it was an adult.