Exec. Producer Martin Moszkowicz tweets photos from Casa Loma
Executive producer Martin Moszkowicz is the Cassandra Clare of the MORTAL INSTRUMENTS movie.
That is he is extremely generous in sharing with fans, which include photos from the set and location hints.
Moszkowicz’s latest set photos come from Casa Loma, a castle that “tells the story of early 20th century Toronto.”
Could Casa Loma be a possible Institute? It was thought that Knox College, where they filmed during week two, was a potential Institute and perhaps it is.
Maybe Casa Loma is being used for exterior shots of the Institute?
What do you think of Casa Loma as a potential location for THE MORTAL INSTRUMENTS: CITY OF BONES? Sound off in the comments!
TMI Source 
It will probably end up being the library interior scenes.
I guess this will be the interior of the Institute. Knox College is probably the exterior (and maybe partly interior).
maybe it’s going to be the library?
it can’t just be exterior shots cuz then why would he have pictures of the inside of the hall?? It’s probably the library, tho casa loma has 99 rooms to chose from..
Maybe it’s Valentines fort?
MUST be the library, it’s a high ceiling with rafters, RAFTERS!
OH! I’m thinking of the trailing room lol. The training room MUST have rafters, it’s important!