The last of three buildings that Renzo Piano Building Workshop designed for Columbia University’s Manhattanville campus in West Harlem officially debuted earlier this week. The three-story building, known as the Forum, is located on a triangular lot at the intersection of West 125th Street and Broadway. The 56,000-square-foot structure will serve as a space for academic conferences, and public meetings and discussions.

The Forum now joins the other two buildings designed by Renzo Piano at …