The fire station that serves as the Ghostbusters HQ it's on Lieutenant Vincent G. Halloran Street on the corner of Varick Street in New York City.
Dana Barratt's (Sigorney Weaver) apartment building (minus the art departments fake upper floors), next door to the church the Marshmellow Man steps on. It's on Central Park West in New York City, between W65th and W66th.
The World Famous New York Public Library where the Ghostbusters see their first ghost, although the interiors were actually shot in Los Angeles. The library is located on 5th Avenue between 40th and 42nd Streets.
The restaurant where Rick Moranis bangs on the window when he is being chased and eventually caught by the gargoyle creature