Although this does not mention the Washington Sanitary Improvement Company, it is about the houses the WSIC built, plus another block. Below is a 2008 post where I misremembered the name of the 1968 report, which I have below the fold. The report, A Program for Bates Street, is just 12 pages with a few pictures of residents, has mentions of rehabilitation and new construction. Fast forward, this was under Marion Barry’s tenure so it got halfway done.
I have the 1968-1974 (the dates I’m unsure of) brochure of “A Plan for Bates Street” in PDF form. It’s a big file and because it is so large, I’m not posting here. However, I will mail it to folks who ask (offer expires in 30 days). Basically, like the title says, it was the government’s plan for the two blocks of Bates, to improve the housing.