I must have been walking toward Eaton Place at about the same time as you were there Des. I saw a youngster flying around and around the building, just below the decorative trim. A fair amount of flapping - but leisurely flapping. I guessed it was one of the girls. Of course by the time I got there, she'd disappeared.
I heard the birds a couple of times earlier today (I'm a couple of blocks south of Graham), but wasn't able to spot them when I looked up. Still it's exciting to hear them.
At the same time as I was watching the youngster circle Eaton Place, I saw someone land on the southeast corner of the Roger's building. I made the assumption it was Ivy as I've seen him land there several times with the grocery bags. Not sure if he stashes stuff there or whether that's his own private dining area.