Thie Slieau Whallian Foxdale Road St John's IM4 3AS Isle of Man Government - DEFA headquarters - Thie Slieau WhallianDetails of the sustainable design of the DEFA headquarters buildingThie Slieau Whallian has been awarded the highest rating of excellence possible under BREEAM (Building Research Establishment Environmental Assessment Method), in terms of its sustainable design and environmental performance. The building is the first, https://www.gov.im/about-the-government/departments/environment-food-and-agriculture/defa-headquarters-thie-slieau-whallian/