So there isn’t anything at 703 R St NW now. You plug it into Google maps and you get the intersection of R and 7th Streets NW. I’m guessing that 703 is over where the CaBi bikeshare sits. Before that it was a parking lot.
Apparently, Ellis Transfer, a moving company owned by Henry Ellis was the business at 703 R St NW prior to the riots. Mr. Ellis was a local African American man who lived around the corner on the 1600 block of 6th St NW. His post-riot conclusion could be summed up as ‘not that bad’. 
Well what he actually wrote was: “Business as I have done pretty good here, but business is slow now and I have had to go to work elsewhere, my wife is keeping things going here.” Including himself and his wife he went from 8 employees to six due to business slowing down. The damage he experienced was extensive glass breakage and some minor fire damage on the roof. Unlike say a retail store, a moving business isn’t that dependent on foot traffic, so I won’t say the riot had a major impact on his business. But the building isn’t there, so something happened between 1968 and whenever the Shaw metro station got put in.
Mr. Ellis had no plans of shutting down his business or relocating. Was he a victim of the riots? Yes, as broken glass and a slightly damaged roof is unpleasant. But he was resilient and his business was the kind that could weather that kind of storm.