Knickerbocker Trust failed amid the Panic of 1907, although a year later it reopened for a few more years under that name. By 1912 it was an acquisition target, and the "Knickerbocker" name disappeared from the firm's title in 1914. Its building at 358 Fifth Avenue, however, was never torn down, but was expanded, then modernized to the point that it's impossible to see Stanford White's magnificent columns.

https://www.nytimes.com/2009/03/08/realestate/08scapes.html

Within a few years, three of the four corners of this intersection would be occupied by buildings bearing some of the most famous names in New York (Astor, Knickerbocker and Altman). The Knick -- did anyone dare call it that when it was in its prime ? -- was widely publicized in the architectural press, and survives today, expanded and simplified ... a Faustian bargain that spared it a Penn Station type date with the wreckers.

The Waldorf-Astoria Hotel was torn down in 1929 in order to erect the Empire State Building. Is the Knickerbocker Trust Building still there?

If you look at that first column of windows closest to the Knickerbocker Building & go up five windows, there appear to be two people there (possibly kids). A shame we'll never know who they were.

[Phantoms! - Dave]