The concrete core continues several hundred feet above the highest occupied floor.

The tower's concrete core began rising in the first months of 2008.

The tower's concrete core began rising in the first months of 2008, and had reached street level by May 17.

Most recent buildings have one or more concrete cores built into the center of the building.

The dam is made of stone with a concrete core.

The house was five cubes arrayed around a concrete core.

The design employs a concrete core which acts as the primary support.

As of October 2011, the concrete core had reached level 22.

It is the first building in the Netherlands constructed with a concrete core and a steel frame.

However, construction was stopped due to funding problems after the concrete core of the structure had been built.