This is very astute, I was using the term "skyscraper city" primarily as colorful contrast with low-density Sunbelt cities.
Philadelphia is indeed the other contender! They weirdly haven't seen explosive job growth though, despite being an excellent city. They also don't have innovative land use policy. But the vast, partially abandoned north Philly is a "reserve army of underemployed land" keeping a check on prices--as is the excellent, fully electrified suburban regional rail network inherited from the Pennsy. Maintains a wide swathe of commutable land w/in 45 mins of CBD.
Philadelphia is indeed the other contender! They weirdly haven't seen explosive job growth though, despite being an excellent city. They also don't have innovative land use policy. But the vast, partially abandoned north Philly is a "reserve army of underemployed land" keeping a check on prices--as is the excellent, fully electrified suburban regional rail network inherited from the Pennsy. Maintains a wide swathe of commutable land w/in 45 mins of CBD.