NYU Linguistics is at 10 Washington Place
Please see NYU's Getting to New York page for helpful information on the airports, train stations, and bus stations that serve the area.
The nearest subway stop from Grand Central (Metro-North) is Astor Place (6 train, green line).
The nearest subway stop from Penn Station (NJ Transit, Amtrak, LIRR) is West 4th (A/C/E train, blue line). Alternatively, you can walk to the nearby 34th St Herald Square and take the subway (R/W train, yellow line) to 8th St.