Sunrise 6:25: Who lives here?

What with Ms. Robin fully ensconced in the new brown umbrella that shades the new teak patio table, the female Dawn Jogger is on the alert for other bird dwellings. Many, many years ago the DJs enjoyed watching an owl family one spring near the Stanford mausoleum, but there was no sign of anyone in the same tree hollow this morning. She came upon one bird condo of sorts on San Mateo Drive not far from the bike bridge over San Francisquito Creek (ripples but no ducklings spotted). Do birds ever actually take advantage of prefab houses?...