If you go to www.rrtc.net you can locate a certified course. Every so often I download the entire course list and do my sorting using Excel.
A search of the list reveals no certified calibration courses in Brooklyn. There is only one certified calibration course in New York City. It’s NY04032KL, and it’s a 1000 footer in Central Park. I must admit I’m surprised at the scarcity. Could be some are listed in Queens or Staten Island or another borough. I didn’t look beyond New York City and Brooklyn.
It is not a lot of work to lay out a calibration course, and I recommend that you do it. Once you are done you will have your own personal calibration course located as close to your home as you can get it. I have mine in the street in front of my house.
In just a few measurements the work will pay off in the time saved in getting back and forth from the cal course. And best of all, it will be your own work, which you can trust.
There is no easy answer to your specific question. By using the search engine you can identify the person who measured the race course, and ask them what they used. You might get satisfaction, but the calibration course may not be certified. Could be it was a one-time-only cal course, never certified. Thus you won't be able to use it.