David Malone, who was charged with reckless endangerment, trespassing and disorderly conduct after Monday's incident said the stunt was "the biggest mistake of my life," The New York Daily News reported Tuesday.
"It caused a public disturbance and put police officers potentially at risk," Malone, 29, said. "These were consequences I had not anticipated. I didn't think it would be that big a deal."
Malone's first appearance in Manhattan Criminal Court was scheduled Tuesday.
He said he no longer believes scaling the Times building was a good way to make his point about that he called al-Qaida's "crusader-baiting" of President George W. Bush.
"Climbing a ladder on The New York Times building was not the best way to do it," Malone said. "It was probably the worst."