Since I'm limited to the preset map with no option to change the terrain, I still had to make some creative "workarounds" while trying to keep as true to form to the city.
I started with laying the ferry in the southern tip of the island, mirroring South Ferry. I was planning to place more ferries to reflect the numerous piers and ferries alongside the east side (Pier 11/IKEA ferry/Water Taxi) but the ferry bulidings in the game take up too much space, especially with the included parking lot. Instead, I used a high density avenue to represent the FDR Drive. To the west of the ferry, I started laying in Battery Park. The WTC sculpture is represented by the Plumbob Park.
After that, it was just a matter of trying to replicate the various streets of Lower Manhattan on the map, although some of the smaller streets had to be removed, as the space in between was too small to allow for any actual building. As I moved further north towards Maiden Lane and John Street, I had to amalgamate a few streets to allow for the Brooklyn Bridge. By the way, the Brooklyn Bridge-like bridge shown in earlier art never made the cut. Instead, we're stuck with either a flat bridge or a Golden Gate-inspired suspension bridge. I opted for the latter.
Real world map for comparison
Roadwork with initial zoning
I used high density avenues for both the FDR Drive and West Street. I used a low density avenue for what would be the entrance to the Brooklyn Battery Tunnel. Too bad I can't lay tunnels under water either.
With the large streets down, I started putting down Water Street and William Street to the east, Broadway and Trinity Place up the middle, and Battery Place to the west.