The Elbphilharmonie is a concert hall in the HafenCity quarter of Hamburg, Germany, on the Grasbrook peninsula of the Elbe River. It is one of the largest and acoustically most advanced concert halls in the world. It is popularly nicknamed Elphi. The Elbphilharmonie with its impressive glass facade and wave-like rooftop rises up from the former Kaispeicher building on the western tip of the HafenCity. Accommodated inside are two concert halls, a hotel and residential apartments. Between the old warehouse and the glass structure is the Plaza – a public viewing area that extends around the whole building.