Did you get permission from the manager of the Flatiron Building? Here in Toronto you can not photograph the one here for any reason without getting permission as it is used in so many movies. Not even for private, nonommercial purposes. I was in the grill one day when someone was taking photos and the manager walked out and politely asked the person to delete the files or turn over the film and he;d process it an send the photos taken that were not of the building plus pay for a replacement roll. The person told the manager to buzz off and within a few minutes an officer approached and suggested the person take the offer or accompany him to the local station. The person handed over the roll and his address and received what looked like a $10 bill. I asked the manager about the incident and he told me the building was copyrighted as an image and taking a photo of it without permission was an criminal offence. I then asked it they would give permission and his response was if for noncommerical use, no problem but othewise there was a fee for a shooting permit. Up here many places seem to have similar requirements including public parks. I was once approached while shooting downtown by a security guard of a building exterior I was photographing. He said that he was to make inquiries of a person if a tripod was used or what appeared to be a professional camera. He was not totally convinced I was not a professional as I had the Meastro tripod (yes, it was my field tripod and has been for some 20 years) as well as my Bronica system and the Polaroid Pack camera, think it was the 180. However, he just said okay when I handed him my business card showing I was a senior employee of a big 4 accounting firm but suggested I lose the tripod in the future.