Glenn Stewart, a biologist with the University of California at Santa Cruz Predatory Bird Research Group, planned to rappel down from the top of the 18-story building into the falcons' nest at approximately 7:15 a.m.
His aim was to place bands around the chicks' legs so scientists can track them and collect data, according to the mayor's office.
Stewart has been banding falcons since the early 1980s and said it is exciting every time.
"I don't like to climb trees or mountains but it's where the birds are," Stewart said. "It never gets old ... Every time you do it, you're going to be really careful."
The process usually takes about 20 minutes, he said.
Scientists are looking at the life spans of the birds because they believe it is an indicator of the overall health of the environment, he said.
Stewart said that because the falcons are high up on the food chain, if the animals they eat have contaminants, that will be reflected in their life span.
The biologist was also able to determine the flacon chicks are all male.
A contest is underway to name the falcon chicks. Participants must be between the ages of 5 and18 and submissions must be received or postmarked byApril 26, 2013.
