Flatiron
One of the tallest NYC buildings at the time it was built in 1902. 
Built on triangular island at the crossing of Broadway, 23rd Street and 5th Avenue.

Other NYC Flatiron pictures in my photostream:
<a href="http://www.flickr.com/photos/katzonic/8665646251/in/set-72157633217574190/">www.flickr.com/photos/katzonic/8665646251/in/set-72157633...</a>
<a href="http://www.flickr.com/photos/katzonic/8667100772/in/set-72157633217574190">www.flickr.com/photos/katzonic/8667100772/in/set-72157633...</a>

San Francisco Flatiron Building:
<a href="http://www.flickr.com/photos/katzonic/8653796718/in/set-72157633231134333">www.flickr.com/photos/katzonic/8653796718/in/set-72157633...</a>
<a href="http://www.flickr.com/photos/katzonic/8652694861/in/set-72157633231134333">www.flickr.com/photos/katzonic/8652694861/in/set-72157633...</a>
nyc newyork architecture kat slim manhattan tall narrow flatiron hdr triangular danielburnham fullerbuilding islandblock 175fifthavenue nikond7000 coasttocoasttrip