The sweep was part of a compliance check, though the Los Angeles Police Department has yet to say if the effort revealed any new clues.
Gatto, a former teacher, was found shot to death Nov. 13 in his home in the 2800 block of Bright Lane in Silver Lake.
A suspect was spotted the night before the killing and threatened witnesses with death when he was caught breaking into a vehicle in the 2300 block of Moreno Drive, according to Officer Sara Faden of the Los Angeles Police Department's Media Relations Section.
The suspect was described as 5 feet 9 inches tall, 180 pounds and in his early 20s. He was wearing a multi-colored hooded sweatshirt and tan pants, a tan backpack and displayed a handgun.
A $50,000 reward for information leading to an arrest was announced earlier this week.
Anyone with information about the case was asked to call Los Angeles police detectives Barry Telis or Chris Gable at (213) 486-6890 or the LAPD's hotline at (877) 527-3247.