This doesn't really fall into a 'prop' category, but some of you might find it interesting anyway...
In the 1999 DVD audio commentary for Ghostbusters, Harold Ramis says, at approximately 24 minutes into the movie:
"We were thinking about what would be the center of the disturbance... different kinds of buildings or places all over the city... I remembered a rooftop in St. Louis which was a replica of a temple, and we started talking about the rooftops of New York. And someone produced a coffee table book called [Ivan Reitman interjects "Gargoyles and"] Rooftops of New York. And we saw all these interesting temples on tops of buildings and strange Gothic structures and they went with that as a design concept. Very interesting, I thought."
Recently, as part of a conversation on the Ghostbusters Archives page on Facebook, I went looking for any book called either 'Rooftops of New York' or 'Gargoyles and Rooftops of New York' and discovered no such exact titles exist.
The only close hit I got was a book called:
Top of the City
New York's Hidden Rooftop World
by Laura Rosen
The first listing that I saw was a later edition, and the post-1984 year seemed to indicate it was not the book used in planning the film.
But then I dug a little deeper and saw that the book was originally printed in 1982!
I found one on a website called thriftbooks.com for the low price of $4.26 and thought, "What the heck? I'll order one just for fun."
Within an hour, I got a Message via FB from someone in the know who said "You and your detective skills!" and said they too had tried to figure out which book Ramis meant, and in their case had occasion to ask Harold's daughter, author Violet Ramis Stiel, and she'd told them it was... you guessed it... the same book I'd just ordered.
It arrived yesterday and was very fun to flip through. I spotted several buildings that I'd visited on my NYC trip in 2014, especially those that were shown in the GB films.
Here's the building that they later used as the Museum in GB2.
And especially intriguing was this very random skywriting message which the author happened to include in the book.
Could this have inspired the term "Terror Dog"? Fun to speculate.
I also bought a later book by the same author, it's from 1998 so no connection to Ghostbusters, but what the hey it was also only $4.
Alex