The new addition is clad in tufa which was custom cast with a slightly convex profile. This subtle articulation of the façade complements the original brick and decorative panels found on the main building. The roof line of the addition aligns with the understory of the sloped roofs of the original building continuing that datum line east.

A garage and support spaces are located below grade in the addition with a large new kitchen and dining area on the main floor, and a library and offices above. The owner’s private book collection is accommodated in the new library with a mezzanine level accessed by two steel open stairs. The quantity of books required a system of double walls that slide to allow easy access to all shelves.

All of the public rooms are orientated to the south facing a large garden which was reconceived by landscape architects Wirtz International. Collaborating with Selldorf on the precinct around the building the area comprises a series of rectilinear paved and planted spaces including a swimming pool and reflecting water feature. These are in juxtaposition to the curvilinear and more expressionistic articulation of the larger landscape.

Two site specific interventions were done by the designers Kram/Weisshaar resulting in a LED installation in the indoor pool room as well as the ceiling of the entry hall.