Because the block that it's built on is shaped that way.
Except for Lower Manhattan, New York City is arranged on a square grid pattern. Broadway ruins this neat little grid pattern by running in a diagonal line north/south through practically all of Manhattan.
Since Broadway bisects some of the rectangular-shaped blocks diagonally, one large rectangular block becomes two smaller triangular blocks. There are more than a few of them dotted around the city, actually.
However, even though Broadway appears to cut diagonally through Manhattan, it actually runs in a straight, true north/south line up and down Manhattan and New York State.
Instead, it's Manhattan that's crooked. All of New York City is built on an eastward slant. Manhattan points northeast, not true north. Broadway starts out in Lower Manhattan and runs north all the way through Manhattan and then almost all the way up through New York State to Canada! It's not called Broadway the whole way, but it's the same street/road. It is the longest street in the world, actually.
So, the Flatiron Building was built in the shape of a triangle because the block that it sits upon is shaped that way.
Flatiron Building was created in 1902.
Flatiron Building - Atlanta - was created in 1897.
It was designed to be an office building, and, to my knowledge, it has always been an office building. So, no, you cannot live in the Flatiron Building.
The web address of the Flatiron Building Heritage Center is: www.barcpa.org
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The phone number of the Flatiron Building Heritage Center is: 724-785-9331.
The address of the Flatiron Building Heritage Center is: 69 Market Street, Brownsville, PA 15417
The Flatiron Building is bordered by 22nd Street to the south, 23rd Street to the north, 5th Avenue to the west and Broadway to the east.
Flatiron building
Yes, in the early 1900's.
I'd call it a triangular building but the answer you are looking for is pyramid but that is NOT what a triangular building is called.
The building also appeared in a famous photograph from 1937 and mirrored the triangular thinness of the more-famous Flatiron Building. It was the German American Insurance Building, built in 1907 and dedicated in 1908. It and the Wolfe Building behind it were demolished in the 1970s.