For the love of huge floorplates. One of the trademarks of the Hudson Yards towers are massive bases for the biggest anchor tenants followed by much smaller pricier floors above.
10, 30, 55 (even the one tower version of 50) Hudson yards are the most obvious, but Tishman's Spiral also has what must be 50,000+ sq ft lower floors. Even the 15 Penn Plaza design has 'trading floors' in its base that will probably be repurposed for a media or technology firm if it ever gets built.
On the other hand we see designs like 3 Hudson Blvd and One Manhattan West that don't setback until very close to the top.