Warren Dahlstrom, a self-described "25-year veteran of the Washington, D.C. property wars," has recently taken on a new role that puts him squarely back in the property wars, but at a much broader scope. At the end of February, Dahlstrom was selected by Colliers International, one of the fastest growing commercial real estate brokerage and services firms in the U.S., to preside over the expansion of its investment services group, recruiting top broker talent and growing the Colliers investment platform across the country.