My 2018 718 CS (CPO) came with a service contract (pre-paid 10k, 20k, 30k, 40k, 50k mi.).
I will be in NYC for a while and the 20k service is coming up. The Porsche dealership in Manhattan (Manhattan Motor Cars) is one option, but I think that they represent many luxury brands, so the mechanics may not be solely for Porsche.
I am open to suggestions in NY, NJ and Long Island. I am looking for a dealership with good reputation for service/maintainance/repairs.