The group previously used The Other Agency to handle its advertising but moved the business into BMB after a competitive pitch.
BMB will be responsible for raising awareness of the brands with an initial 14-week campaign that will launch in the spring.
Digital Property Group, which is owned by A&N Media, a division of Daily Mail & General Trust, has said that it will spend £7 million on marketing across all of its sites.
Last October, the company consolidated its media planning and buying business into MediaVest. The agency, which was the incumbent on the FindaProperty.com account, won the business after a closed pitch against Primelocation's agency, MediaCom.