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Washington, D.C., 1919. "Automobile with ad for Oppenheimer's shop, 800 E Street N.W." Faintly visible in the distance on the left is a large sign for the Center Market. National Photo Company Collection glass negative. View full size.
Below is the view from September of 2010.

Advertisement, 1918Oppenheimer's
8th and E Sts.
Headquarters for Sewing and Knitting Needs.
Plaiting, In All Its Branches: Embroidery, Initialing, Braiding, Hemstitching, Beading, Picot Edges.
Fringes: All the vogue for waist, dress and gown trimming. We make them to order in any color you want.
Buttons: Pearl, Fancy and Cloth, in All Shapes and Sizes. Buttons to Order to Match our Garments.
Ribbosene Silk: For Sweater Knitting. We Carry in Stock All the Pretty Colors.
Yarn and Wool: Our stock is always complete.
Dress Forms: Dressmaking is a simple pastime if you have a good dress form to make your dresses, waists or gowns over. We have all styles at popular prices.
Sewing Machines: Singer, New Home and other makes. Always bargains to be had here in sewing machines.
Sold on Easy Payments.Oppenheimer's
Shop Unique
Cor. 8th and E Sts. N.W.
Dodge Brothers commercial screenside, a sort of van-pickup hybrid that was popular until the 1930s.
Can you figure out what's making that funny noise under the hood? And go ahead and burn out the carbon while you're at it.
Oh wait, I'm fuel injected now.
The photo does indeed show the Oppenheimer's at 800 E Street. It was on the corner with facades on both 8th and E Street, which is just behind the camera.
Apparently, Oppenheimer's had more than one location. The address on the truck clearly notes "800 E Street, N.W." but this view (with "Oppenheimer's" noted on the storefront) is looking south from the 400 block of 8th Street NW (toward what was the Center Market as Dave noted and is now the National Archives). Looks like I might have to take "+91" tomorrow if I can get out of my office for a few minutes.
Update: Dangit! I just realized that it was a corner building and had to log on to update my post, but an Anonymous Tipster pointed it out first.
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