I've seen quite a few takes suggesting NYC will be transformed by the sudden arrival of high earners, like the Seattle city councilors who went to NYC to warn the city about their mistakes.[1] Whatever Amazon's merits, the specific arguments seem ludicrous.
Seattle lawmakers talked about how Amazon took up 20% of the city's office space. That was 45,000 workers in a city of 730,000 (6%), and a metro area of 3,800,000. NYC was looking at 25,000 Amazon employees against a city population of 8,600,000 (0.02%), and a metro population of 20,300,000. This claim looks similarly awful. NYC and Seattle have surprisingly similar average salaries ($69K), but the relative impact of 25k workers earning double that is 1%-5% as large in NYC. Manhattan is already the highest-earning county in the entire nation, so much so that adding Amazon employees there would bring down the average salary!
If anything, what I find wildest is that NYC has kept its housing prices halfway sane. It's wrapped around a river and a bay, half on an island, in the middle of an area so urbanized it inspired the word 'megalopolis'. A huge fraction of its development is pre-automotive, so transport in and out ranges from 'tricky' to 'crisis'. It has the highest-earning county in the country, which is also one of the highest wealth-throughput areas in the world.
And so the median house price there is... perhaps 20% higher than Seattle's, despite 4x the population density? Manhattan prices are at the same income multiple as Seattle and the rest of NYC? What the heck? It's not that people don't know Seattle housing prices are excessive, and the boom is pretty recent, but I don't understand why it's viewed as a narrow issue of wages and population growth. Whatever raised those prices, they still point to something seriously wrong with the way things are functioning now.
[1] https://www.theguardian.com/technology/2019/jan/07/seattle-l...