NY Pay
I believe AF starting pay is around 40K first year then around 44K second year, based in NH. However, their benefits are quite good. Excellent medical, dental, 401K, life insurance, etc. They do, also, provide x number of dollars for a phone. Just mentioning this as a baseline for comparison. They have been doing it since 1994 with the PC-12. And no thaey are not opening a base in the NYC area.
As far as NYC metro. Out of HPN, CDW or (god forbid) TEB. I would expect 5-10K more than this (I've lived down there) with FULL benefits. If you have to pay your own medical that $50/hr is now more like $35/hr BEFORE taxes. Not so good.
Also, you say 300hr/year. Is that for the aircraft or the pilot? I think you'll find the average frax pilot is flying considerably more than that. Is there going to be more than one Pilatus? If this is a one airplane frax I would be VERY careful.