In other words, the Mangin–Goerck Plan was a guide to where and how Mangin believed future streets should be laid out. It called for enlarging the tip of the island and using landfill to regularize its waterfront. He placed a number of street grids on land that was, at the time, agricultural or undeveloped. The grids, which had different baselines, met up, and there Mangin placed parks and public spaces. He extended the Bayard grid northward, and the De Lancey grid to the east and north, and created a new grid of true north–south/east–west streets, among other inventions. As Gerard Koppel comments: