The JBG Companies 939 N Van Dorn St, Alexandria, VA22304-5980 The JBG Companies is a real estate firm that is one of the most prominent within the Washington area. It offers…More properties for residential, hotels, retail and mixed uses. JBG is an investment firm that assess the value of each property. The professional team is highly skilled and offers the best investment for clients. The JGB companies has locations in District of Columbia, Virginia and Maryland.