Michael Kimmelman: “The site of the Sept. 11 memorial is not singularly devoted to those who died. It also serves as the forecourt for an office development and as public space for Lower Manhattan. The neighborhood was a casualty, too, along with the rest of New York. In the tortuous planning process, victims’ families and real estate interests needed to be reconciled with the interests of everyone else in the city, including those who live and work downtown. So far, I’m not sure it’s working.”