The suspect has entered through unlocked doors and windows and has stolen computers, money and clothing along Los Feliz Boulevard.
The suspect also sexually assaulted two of the victims while they were sleeping, according to investigators.
"At first it was not reported, but as detectives have interviewed the victims and re-interviewed the victims, they've come to find out that they were sexually assaulted. It wasn't just a dream," said Officer Rosario Herrera of the Los Angeles Police Department.
Police described the suspect as a Hispanic man, between 5 feet 7 inches and 5 feet 10 inches tall and weighing between 160 and 180 pounds. He is said to be in his mid 20s or 30s with a slim build, dark complexion and a mustache.
If you have any information that can help investigators, you're urged to call Los Angeles Regional Crime Stoppers at (800) 222-TIPS.