This is known as a Marina Safeway, a design prototype the grocery chain used extensively across North America (here's one in San Francisco, and another in British Columbia) in the 1950's and 1960's. Fans of the Marina Safeway consider it to be an exemplar of Googie or Mid-Century Modern design, with its sweeping arched roof, minimal decoration, and plate glass windows.
On Flickr, reader Stu_Jo asks where other Marina Safeways in the D.C. area are located. JUTP knows of the one on University Boulevard in Four Corners, photographed here by Googie adherent Sligo of Silver Spring, Singular, and one on New Hampshire Avenue in Colesville that was demolished in 2000. Where else have you seen one? Leave a comment or shoot an e-mail to justupthepike at gmail dot com.
UPDATE: Here's a map of Marina Safeways in the region, based on locations given by our commenters.
View marina safeway in a larger map