The Donaldson Group, a Rockville-based multifamily operator and investor, and commercial real estate veterans Andy Shulman and Matt Gannon have partnered to form TDG/SILVEROCK, a full service commercial real estate investment firm. TDG/SILVEROCK provides in-house capabilities including property acquisition and disposition, landlord & tenant leasing, property and asset management, investment sales, debt financing, and project management in the Greater Washington – Baltimore Metropolitan area.