Realogy Holdings Corp. affiliate Century 21 Peak, a real estate brokerage, acquired Century 21 My Real Estate Co. in Downey, Calif., from Steve Roberson.

The deal increases Century 21 Peak's number of agents by 100 to nearly 450, according to a release. Roberson will consult with the acquirer and remain a company liaison to the local community.

The move is part of Century 21 Peak's push to expand its presence in Southern California.