Examiner.com has published a story that focuses on one of the main reason why Christopher Nolan chose to use Pittsburgh as his primary filming location. An arena, named Civic Arena, is said to possibly being used for key scene in the movie that uses an explosion.
Reports Examiner:
The ability to explode the Civic Arena and use the footage for a key scene in the movie may have been the key bargaining chip that brought The Dark Knight Rises to Pittsburgh.
For more on the specifics what led to being able to use the building click the source link.
The Dark Knight Rises is schedualed to come out on July 20, 2012