Although the outer façades have a robust and urban character, the inner courtyards are designed to be more intimate in scale and atmosphere. The courtyards are inspired by the traditional “Leidse hofjes,” historic courtyard typologies in Leiden characterized by simple façades, light brickwork, and a central green space, often organized around a single tree. The larger courtyard is enclosed and private, framed by white wooden galleries and planting. The second courtyard is semi-open and less enclosed, with a central tree, lawn, seating areas, and play elements. The galleries facing the courtyards are designed with additional width, allowing them to function not only as circulation spaces but also as semi-private outdoor areas. Residents can place seating along the façade and use the space informally. A folding door system allows parts of the gallery to be enclosed, creating a winter garden. The intermediate volumes between the corner buildings echo the language of the inner world: white façades, large window openings, and vertical wooden elements create a lighter character. On the ground floor, the “specials” typically contain either an entrance lobby or a gateway providing access to the inner gardens. On the upper floors, they accommodate distinctive housing typologies or collective spaces.

Due to the project’s location next to the park, ecological integration is an important aspect of the design. In collaboration with an ecologist from the municipality of Leiden, the local flora and fauna were studied to develop a nature-inclusive approach. Measures include green façades, various types of green roofs, and nesting boxes to support local bird and bat species. Water retention systems on the roofs and within the courtyards slow down rainwater runoff and allow for reuse in irrigation. Part of the natural stone from the demolished building will be reused in the entrance halls and collective areas. One building incorporates CO₂-negative Pirrouet bricks. All owner-occupied apartments are equipped with a low-tech ventilation system that supplies fresh air directly through the façade into individual rooms, reducing material use and energy demand. Beyond environmental measures, the project places strong emphasis on social sustainability. Collective spaces — along the central street, within the galleries, inner courtyards, across connecting bridge, and on the rooftops — are strategically positioned to stimulate encounter, exchange, and a sense of belonging.