1. Let's start with an easy one. New or newish - when was this built? New York Observer / Via observer.com 1970s Correct Incorrect 1970s 1990s Correct Incorrect 1990s 2000s Correct Incorrect 2000s Correct! Wrong! This glass beaut at 40 Mercer Street was built in 2006. 2. Another pretty easy one - maybe... Richard A. M. Stern Architects / Via ramsa.com 1920s Correct Incorrect 1920s 1930s Correct Incorrect 1930s 2000s Correct Incorrect 2000s Correct! Wrong! A celebrity favorite, 15 Central Park West was built in 2007, despite its old-style architecture. Find out which A-listers call this building home on 6sqft. 3. Now it gets tricky. The Diaman Group / Via thediamangroup.com 1890s Correct Incorrect 1890s 1910s Correct Incorrect 1910s 2000s Correct Incorrect 2000s Correct! Wrong! 408 Greenwich Street was built in 2007 to blend in with the old industrial buildings in Tribeca. Learn more about this building on CityRealty. 4. How about this bad boy? Which decade do you think this was built? Commercial Observer / Via commercialobserver.com 1860s Correct Incorrect 1860s 1880s Correct Incorrect 1880s 1900s Correct Incorrect 1900s Correct! Wrong! 140 Franklin Street was built in 1887...and converted into fancy condos 100 years later! 5. May want to take a second and think about this one for a bit. Urban Compass / Via urbancompass.com 1970s Correct Incorrect 1970s 1990s Correct Incorrect 1990s 2010s Correct Incorrect 2010s Correct! Wrong! 265 East 66th Street was built in 1978. An old(er) building that looks brand spankin' new. 6. Com'n you got this! Bracha Blog / Via brachablog.com 1970s Correct Incorrect 1970s 1980s Correct Incorrect 1980s 2000s Correct Incorrect 2000s Correct! Wrong! Trump Tower was built in 1983. It looks a bit like some of the newer buildings - but, in fact, it's about as old as Trump's toupe hair. Learn more about this building on CityRealty. 7. Almost to the end. uppereastside-apartments.com / Via uppereastside-apartments.com 1920s Correct Incorrect 1920s Seller's Collective / Via sellerscollective.com 1930s Correct Incorrect 1930s 1940s Correct Incorrect 1940s Correct! Wrong! This is 834 Fifth Avenue and it was built in 1931 by famed pre-war architect Rosario Candela. Learn more about one of the most desirable residential co-op buildings in NYC. 8. Last chance to prove yourself. Which decade was this built in? CityRealty / Via cityrealty.com 1980s Correct Incorrect 1980s 1990s Correct Incorrect 1990s 2010s Correct Incorrect 2010s Correct! Wrong! You've made it to the end! Frank Gehry's 8 Spruce Street was built in 2011. Learn more about New York by Gehry on CityRealty.