Stoyan Nicholas Karastoyanoff, AIA (; 10 December 1870 – 16 July 1931) was a Bulgarian-American architect practicing in New York City in the early twentieth century. He immigrated to the United States in 1903. He is best known as the architect of the current Holy Cross Armenian Apostolic Church (New York City). In the 1910s he practiced from 114 East 28th Street before moving uptown to 220 Audubon Avenue, Washington Heights, Manhattan, roughly following the concurrent migration of German immigrants there of whom many where his clients.Office for Metropolitan History, "Manhattan NB Database 1900-1986," (Accessed 25 Dec 2010).

Works 1917: Bashein Garrage, 376 West 213TH Street, a single-storey brick garage for $20,000 1917: Arras Garage & Auto Supply Co, 4892-4 Broadway, single-storey brick storage & warehouse for $25,000.00 1925: Norwegian Free Mission Church Sunday School, 461 West 166TH Street, single-storey brick Sunday School with a rubberoid roof (bitumen?) for $15,000 1925-1926: The Evangelical Lutheran Church of our Savior, 578-580 West 187th Street, now the Holy Cross Armenian Apostolic Church (New York City) since 1929.

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