According to Wikipedia:

The Flatiron Building, originally the Fuller Building, is a triangular 22-story steel-framed landmarked building located at 175 Fifth Avenue in the borough of Manhattan, New York City, and is considered to be a groundbreaking skyscraper. Upon completion in 1902, it was one of the tallest buildings in the city at 20 floors high and one of only two skyscrapers north of 14th Street – the other being the Metropolitan Life Insurance Company Tower, one block east. The building sits on a triangular block formed by Fifth Avenue, Broadway, and East 22nd Street, with 23rd Street grazing the triangle’s northern (uptown) peak. As with numerous other wedge-shaped buildings, the name “Flatiron” derives from its resemblance to a cast-iron clothes iron.

The building, which has been called “[o]ne of the world’s most iconic skyscrapers and a quintessential symbol of New York City”, anchors the south (downtown) end of Madison Square and the north (uptown) end of the Ladies’ Mile Historic District. The neighborhood around it is called the Flatiron District after its signature building, which has become an icon of New York City.

The Flatiron Building was designated a New York City landmark in 1966, added to the National Register of Historic Places in 1979, and designated a National Historic Landmark in 1989.

It has been photographed by a number of famous photographers including Alfred Stieglitz (The Flatiron) and Edward Steichen (The Flatiron).

This is my take on it. Initially, as a kind of hommage to Steichen and Stieglitz, I thought to give the picture an old style “pictorial” look, but I didn’t like it. Then I tried a straight black and white conversion. Didn’t like that either so I decided to just leave it in its original color. If it works at all it seems to need the color. I think what’s happening is that the eye is drawn to the bright colors (the yellow dress and the red bag) to the bottom right of the picture. It them moves up through the photographer in the white shirt and follows the blue umbrellas to the base of the building from where you follow the vertical lines of the building upwards. At least that’s my story – and I’m sticking to it.