The "subsidies" in this case in NYC were a tax rebate over 10 years tied directly to the number of positions created. The Empire program itself was meant to incentivize new offices to open in boroughs other than Manhattan to help distribute the load on transit and other services. Any company opening new office space was eligible, not just Amazon.
The only real "subsidy" in the NYC deal was a land grant where an old plastics factory used to be that required significant environmental clean up. The land is also next to the notorious Queensbridge projects.
Really considering we mostly work in this industry, the amount of ignorance surrounding the deal, its incentive structure, and how it went up in flames is staggering.
Even the talking point about how Amazon opened up new NYC offices anyways is completely innumerate, so far they've created about 1/5th of the positions that they were projected to create under the HQ2 proposal.