Landscape Formation One (Interpreted as "Landscape formed into one") is the name of a building designed by the Iraqi-born British architect Zaha Hadid for the state garden exhibition Grün 99 in Weil am Rhein, Baden-Württemberg. It is also known as the Hadid Pavilion (Hadid-Pavillon) and LF one..

The building was designed in the late 1990s, serving as an exhibition space during the state garden fair. At the end of Grün 99, the building became the official headquarters of the Trinational Center for the Environment (TRUZ/CTE) "Trinational Center for the Environment (TRUZ/CTE)").

The Landscape Formation One building is located in the Dreiländergarten, about two kilometers south of the town center of Weil am Rhein. The sculptural and aerodynamic building, 140 meters long, forms a sinuous curve from northeast to southwest. The landscape form fits into the context of the mountainous landscape and therefore connects with the rural area south of Weil am Rhein and north of the city of Basel.[1] A paved ramp leads over the building from the southwest between the roof and the railings. This ramp, which is similar to a walkway, can be accessed from the northeast side via a traditional staircase.

The land area occupies 845 square meters; the materials used were local; Exposed concrete and glass. The roof is partly covered with green areas and other parts with gravel.

The client, Landesgartenschau Weil am Rhein GmbH, awarded the project directly to Zaha Hadid Architects (ZHA) without competition or tenders. Contributing to the project were Hadid's London architect and business partner Patrick Schumacher, the Mayer Bährle office[2]​ and also the Freie Architekten DBA group from the neighboring city of Lörrach. Planning began in 1996 and complete completion lasted until 1999.[3]​.

The building now serves as the headquarters of the TRUZ Environmental Center "Trinational Center for the Environment (TRUZ/CTE)") and houses offices and exhibition rooms, as well as a restaurant. The complex has stability at high temperatures in both summer and winter. This is achieved, among other things, by the low energy consumption standard of 60 kWh/m² and the insulation using cellular foam glass. Heating is generated by the power plant of a nearby pool that combines heat and electricity (Blockheizkraftwerk BHKW). The restaurant is ventilated by the gravel log in the floor; Sanitary facilities use rainwater to flush. Despite being a modern construction, energy saving and renovation measures were already considered in 2013. Spalling and cracks in concrete are also a visual impediment and part of renovation studies.[4]​.