I birded Bond Park this gray day. As I walked past the location where the East Side owls have been nesting, I noticed that the female was not in the nest cavity. There was an owl perched in the pine where the male was previously known to perch. I watched this bird fly toward the cavity, landing on a perch nearby. Later, it flew to another pine farther away.
This afternoon I stopped in again. The female was not in the cavity. The nest appeared to be abandoned. With the aid of my binoculars, I noticed a white egg at the base of the tree where the cavity is. Assuming the worst, I walked to the tree and retrieved the egg. It was cold.
A couple of crows were harassing an owl in the pine where I last saw the owl this morning. Here is a photo of the egg beside a brown chicken egg for comparison.