Of the NY real estate terms 'sliver' is probably the only one that was sufficiently 'evil' enough to title a horror movie. In modern parlance a 'sliver' is one of those high rise apartment buildings set on an extremely thin lot - something like 20 storeys on the footprint of a brownstone.
It's not exactly a new phenomenon...
The very first steel frame skyscraper - the optimistically named 'Tower Building' went up on lower Broadway in 1889. The architect Bradford Gilbert was oblidged to take an office on the top floor to calm fears...