Bale tells Sipowicz and Clark that there was a similar murder in the 9th precinct. The exterior of the 15th precinct on the show is the real 9th precinct in New York.
Ortiz and Murphy tell suspect Hal Matheson to meet them at the 15th Precinct at 111 E. 5th St. As the exterior shots frequently show, the correct address is 321 E. 5th St.