What is "heelis"

Heelis is the headquarters of the National Trust, in Swindon, Wiltshire. Heelis was the married name of Beatrix Potter, one of the key figures in the early history of the National Trust.

It was built in 2005 by Feilden Clegg Bradley Studios and is considered one of the greenest office buildings in England, incorporating silent, natural ventilation and open-plan meeting spaces.