I’m not entirely sure of what project this is an architectural rendering, but I suspect it is an unbuilt project designed by Cass Gilbert for Blackwell’s Island in the East River, later known as Welfare Island and now Roosevelt Island. There were a number of schemes before the First World War (Thomas J. George was the author of one) for the construction of a new civic center for New York on the island, which is located right in the middle of the five boroughs.
A fine design, if marred by the besetting sin of that period: giganticism.
^Mr. Clark should have ended the comment after “A fine design.” Giganticism is no sin when beautiful Architecture is involved. It’s a sin when it’s crap (e.g. modern era) arch… we live in an ocean of that “sin” today.
Anyway, the design & drawing is by Francis Swales and was part of the Regional Plan of 1929 for NYC. You can find this an many other “woulda, coulda” beaux-arts grand plans for NYC by Swales by googling the actual Regional Plan of 1929 (pdf online