Based in Washington, D.C., Karn Charuhas Chapman & Twohey is a full-service architectural, planning and interior design firm. The company which has 25 years of international design experience provides clients with professional services through innovative design, construction documents and construction administration. The company s planning experience includes site evaluations, feasibility studies, long range facilities, land planning, transportation and multimodal studies and master plans. It provides design services, specializing in programming, space planning and interior design, furniture, furnishing and equipment. It also serves new construction, renovation, preservation and housing.