June 6 Update
All three youngsters are practically fully grown now and one of the males has even left the nest ledge. He was seen on a roof above the west entrance to City Hall yesterday morning where he will be safe enough.
The other two, a male and a female, could be seen wing flapping and getting themselves ready for their first flight. It won't be long before they're out and about.
So far, so good, although the next two or three days are still perilous for the youngsters as they don't have the strength to get back to the higher ledges in the first few days after their first flight. Fingers crossed that all three will be safe and fledge this year.