Something seems odd with the idea that high rises were ‘natural’ :-)
For me, the “concept” is terribly wrong.
A park itself is fine, but you can’t use one park as an excuse for not having other parks, green areas etc. anymore in a big city.
New York has 5 times more people than Munich. But Munich’s biggest park is about the same size as New York’s Central Park (a little bigger even). And if you count all the green areas, parks etc. in Munich together, they are 6 times larger (counting only the ones that are publicly accessible and listed in wikipedia) than that Central Park.
So, give your New Yorker’s 30 central parks and lots of other green spots, and you got a concept.