“‘Our challenge was to reinvent the campus,’ architect Renzo Piano says of Columbia University’s proposed $7 billion expansion. Actually, the plan now making its way through New York City’s arduous approval process looks more like a dumbed-down real estate deal than a vision for the future.” In Harlem, “Columbia has not closed off streets to make a gated, intimidating superblock, as its old campus does. Yet the size and bulk of the proposed buildings make the streets anything but inviting to the surrounding neighborhood….”