Purdy and Henderson was a New York City-based engineering firm founded by Corydon Tyler Purdy and Lightner Henderson. They were active in the United States and Cuba between 1890 and 1944.

40 Wall Street is a 927-foot-tall (283 m) neo-Gothic skyscraper on Wall Street between Nassau and William streets in the Financial District of Manhattan in New York City, New York, U.S. Erected in 1929–1930 as the headquarters of the Manhattan Company, the building was designed by H. Craig Severance with Yasuo Matsui and Shreve & Lamb. The building is a New York City designated landmark and is listed on the National Register of Historic Places (NRHP); it is also a contributing property to the Wall Street Historic District, an NRHP district.