Twisting facade connects historic building with red-brick office by 3XN

Danish architecture firm 3XN has built a brick-clad office block next to a renovated 19th-century building in central Stockholm, linking the two with a twisting upper storey.
3XN oversaw the renovation of the Astoriahuset building in Stockholm's historic Östermalm district, along with the design of the connected office building at Nybrogatan 17.
Top: the twisting facade. Above: the refurbished Astoriahuset building
The multi-storey Astoriahuset building dates from 1874 and was built to hous