Great set of shots. I'm convinced that the flatiron on Church can never look bad in a photo.
I'm actually in the market for a wide lens at the moment, do you find yourself using the 10 or 20 end of your zoom more in taking photos such as these? Judging by perspective distortion can I assume 10?
ya, definitely try to use as much of the lens as possible. Sometimes I'll zoom it to 20mm if there is a better composition by doing that. You might want to read reviews of various wide angle lenses before buying. I know my Sigma can be blurry around the edges at wide aperture settings.
yes, all of these are long exposures - anywhere from 0.5 - 15 seconds. Also, most of them are multiple exposures digitally blended together to give an idealized version of each scene.