The Harbour House is the result of transforming an office building into 142 sustainable and modern apartments, to be completed in 2024 in Rijswijk's  Elsenlaan. Sustainability is the common thread throughout this property, with high-quality insulation of the roof and facades. The gas-free building will be cooled and heated by ventilation heat pumps. To mark its green aspirations, room has been made in the proximity of the building for various amenities such as nesting boxes and a flower garden.