Randall Hagner

Full-service firm serves commercial owners, tenants, homeowners, and investors.
http://www.hagner.com/

William Sawyer & Co. Realtors

Specializes in middle-to-upper bracket residential properties as well as commercial/investment properties in the Washington D.C. and Maryland area. Features virtual tours.
http://www.williamsawyer.com

Rob Bergman - RE/MAX

Residential and commercial services in the District of Columbia with offices in Georgetown and on Capitol Hill.
http://www.robbergman.com/

HomeState Realty

Providing residential and commercial services for buy, sell, lease, or investment.
http://www.HomeStateRealty.com/

Delbe Companies

Services include residential and commercial property management, development, construction and home maintenance. Features FAQ, news, franchise information and sign-up forms.
http://delbe.com

The Jason Corporation

Commercial real estate brokerage, management services for corporate clients and investors and residential brokerage.
http://jasoncorporation.com/

DuPont Fabros

Real estate investment and development firm that acquires, develops, manages and operates commercial office, internet data center, flex, industrial, residential, retail and hotel properties. Includes property listings.
http://www.dupontfabros.com/