Citigroup Center vs One Astor Plaza

Comparing the Citigroup Center and the One Astor Plaza is interesting because they both stand in New York, NY, and were completed within 4 years of each other, but they were designed by different architects.

This offers a unique glimpse at how rival designers approached projects in the same city during the same era.

The Citigroup Center is clearly the larger tower of the two, both in terms of height and number of floors. It rises to 755ft (230m) with 59 floors above ground, while the One Astor Plaza reaches 745ft (227m) with 54 floors above ground.

Of course, each project may have faced different briefs or regulatory constraints, which we don't really know about and could also explain the outcome.

Both the Citigroup Center and the One Astor Plaza were designed in line with the aesthetic conventions of the Modern style.

Both buildings were completed when the Modern style was already past its peak. This makes them feel like late echoes of the movement, more reflective of continuity or nostalgia than of cutting-edge design at the time.

Both the Citigroup Center and the One Astor Plaza were designed to serve as commercial towers, and that has remained their main use since their completion, serving similar roles in the urban fabric.

The One Astor Plaza also provides 225 parking spaces.

The two towers rely on different structural systems, reflecting distinct engineering strategies.

The Citigroup Center uses a Trussed Frame structural system, which uses diagonal bracing in addition to beams and columns for stability, while the One Astor Plaza uses a Framed Tube In Tube system, that combines a strong central core with a perimeter tube of columns.

Yet, when it comes to their facade, they both employed the same solution, a Curtain Wall facade.

A curtain wall is a non-load-bearing facade hung from the structural frame. It is anchored to floor slabs and transfers only its own weight and wind loads, allowing for sleek, glassy exteriors.