You mean like the $4.5 billion 2nd Avenue subway that is nearing completion after being discussed for something like a hundred years.<p>And, while one can always build more and build higher, Manhattan isn&#x27;t exactly a study in low-rise construction (although much of the city is low&#x2F;mid-rise). And if you stay in NYC hotel rooms where you&#x27;re looking out at some narrow shaft between buildings, it&#x27;s not hard to understand why there are some limits on just building skyscrapers willy nilly.