Started from the end of the Broadway Bridge on the Manhattan side and ripped down Broadway to the bottom of Manhattan.
Crossed Bridge Street (where Broadway turns into Whitehall Street, a few streets after the Charging Bull statue) in 1:13:18 for 13.42 miles, which is what I used for the total time above. I then ran as far south as I could before turning around and returning to Bridge Street to make sure I at least hit the total GPS distance of David Kilgore's previous FKT, which was 1:18:55 for 13.78 miles, and so I ended up totaling 1:15:32 for 13.83 miles.
Elevation in my Strava activity is wrong for the second half; the total elevation gain of closer to 400 feet from Kilgore's Strava activity seems accurate.
Editor: The end of Bowling Green was reached in 1:12:51