A fan asked PLL showrunner Marlene King this very question via Twitter, and Marlene explained all, saying, "[Caleb] has his own place."
That means Caleb, like Toby (Keegan Allen), is living on his own these days. We know Toby has a job to support himself, but it's unclear how Caleb is affording his new lifestyle. Perhaps his biological mom has started funding his Rosewood home.
Catch an all-newepisode of PLL on Tuesday, July 10 at 8 p.m. ET/PT onABC Family.