DH Steffens Company in La Plata, MD serves Residential, Commercial customers. We specialize in Reclamation,Site Development,Residential,Commercial,Planners. We have been proudly serving the La Plata, MD area since 1923. Architects, Engineers, Surveyors & Planners is a family owned firm of architects, engineers, surveyors and planners, specializing in municipal projects for smaller and medium sized communities.