Now that Walter Reed has closed—-and nearby businesses are suffering from drastically reduced traffic—-the city is grinding through the process to craft a new reuse plan for the site. The local redevelopment authority is re-soliciting notices of interest from homeless providers and government agencies, reserving the right to stick with its original choices (or not). But it’s treating the most iconic piece of the campus—-the century-old brick edifice known simply as “Building 1″—-separately from the rest. Last month, the city issued a “request for ideas,” calling out nonprofit, educational, and corporate entities to come up with ways to reuse the nearly 400,000 square foot building. (The hulking hospital behind it, by contrast, will most likely be demolished). Responses are due on October 18.