The Z58 building is primarily a glass box allowing light to enter through three sides as well as through the roof. Internally clear glass walls in many parts of the building, as well as floor panels of translucent glass, add to the variety of light within.
The main building is set back from the street and an expansive lobby is created between it and the outer facade. Here horizontal mirrored planters partially hidden by the ivy growing from them lend a subtle sense of invisibility to the street front. The buildings outer wall, one wall of the lobby, is a waterfall of horizontal glass slats leant back slightly from the vertical. In the morning light it projects multiple rainbows into the interior. From the street entrance a series of walkways, flanked by pools of water over black stone, lead through the lobby. A free standing elevator allows access to all floors via a series of glass bridges. Additionally a single. straight stairwell running the length of the building also connects all floors.
The top floor includes a series of glass walled meeting rooms, two apartments with bathroom facilities and sauna, as well as a library and kitchen. The smallest of the meeting rooms extends as an island into an infinity pool running the length of the building and overlooks adjacent gardens.