Rosario Candela played a major role in shaping the architectural legacy of 20th-century Manhattan: the distinctive "prewar apartment buildings that define the cityscapes of streets like Park and Fifth Avenues and Sutton Place." Even today, almost a century after they were built, Candela's buildings rank among the most prized in the city.

1021 Park Avenue ca. 1942 The L shaped plan of 1021 Park Avenue stems from the days when the Upper East Side real estate was dominated by mansions. The Pinchot family, having built themselves a lavish abode, sold some of the lots surrounding their mansion to other families, requiring them to be used as private homes. Eventually, they sold their home to Edward Stettinus, who continued to purchase land, but (due to the Pinchot's earlier sales) had to wrap around some lots, creating the curious L shape. In 1928, the developer Anthony Campagna bought Stettinus' land and planned to erect an apartment tower, bringing in his frequent partner: Rosario Candela. Candela, created a neo-gothic design for the building's street faced that was atypical of his normal style, incorporating features like the shields and gargoyles. For the non street facing facades, he used light brick an irregular window pattern due to the interior combination of duplex and simplex apartments. The building was a massive success with the majority of the apartments selling in almost a month.