Ostfeld is a planned urban development area in southeast Wiesbaden, Germany, north of Mainz-Kastel, west of Erbenheim and south of Wiesbaden Südost. The project is led by the City of Wiesbaden; the city’s planning office and SEG Wiesbaden are identified as commissioning bodies for the design competition. The project page does not name individual project managers or give a separate founding date.
The development area covers approximately 450 hectares. Plans allocate about 70 hectares south of the A66, around Biehler Wäldchen, to a new urban quarter with housing for at least 10,000 people. The proposed neighbourhood is intended to include local services, social infrastructure, green public spaces, and routes mainly for pedestrians and cyclists, as well as opportunities for recreation and community activities.
North of the A66, around 30 hectares are planned for a central Bundeskriminalamt (BKA) site. The campus, referred to as “ALL IN ONE,” is intended to bring together BKA locations currently dispersed across Wiesbaden. The wider development also includes office space and some commercial areas; three quarters of the overall area are reserved for nature-oriented uses, including agriculture and biotope-network areas.
The City Council’s development-statute decision dates to 17 September 2020, and the statute became legally effective on 10 August 2021. A one-year design competition concluded with a jury meeting on 31 October 2024, when the selected designs and prize winners for the neighbourhood, surrounding landscape and BKA site were determined.