Vacant space model

Hellenikon Metropolitan Park will be a large urban park located in Hellinikon, Athens, Greece. The park will be the central attraction of the Hellinikon project. It will provide Athens with a much needed ecological boost. When finished the park will be the largest in Europe. It will be approximately 200 hectares spanning the site of the former Hellenikon International Airport (Ref 4). The project will follow an integrated approach to sustainability. The objective is to boost greenery and create high-quality spaces while minimizing the natural resources used, protecting and enhancing the ecosystems in the region, and also raising awareness and educating the public on sustainability issues (Ref 1). Initially, the project was planned to start in 2008 and to be completed by 2013, but with the unfortunate and unseeing financial crisis worldwide, was shelved. A part of the project has been completed in the first 5 years. In 2013, a new design strategy for the project was submitted as part of The Hellinikon Project. The team included Foster & Partners, Charles Anderson Landscape Architecture, ARUP and a group of Greek design consultants. The design was revised and resubmitted to the Greek government in 2018 (Ref 3). The project is now under the consideration of the Greek Ministry of Culture for infrastructure and monuments (Ref 1).

Collaboration between the City of Aarhus and private property developer DOMIS Ejendomme has been recognised by the award of a silver certificate for sustainable urban planning for the Bryggervej project. The aim of the project is to try out various sustainability principles. Green and blue solutions are included in the project, e.g. green roofs, green facades, green open spaces and blue elements/water in the park areas to increase recreational values and add moisture to the dry urban air. (Ref. 1, 2, 3)
By 2020, the first residential project was built called Risskov Brynet (Ref 8). Information in the project since 2017 is about this project. The project is certified according to DGNB Gold because it is based on a high standard for both social, economic, and environmental sustainability. An important part of this project is a 'highly insulated climate screen', a technology of the project that is incorporated into the project to address climate change (Ref 8, 9, 10).

On the derelict industrial plant in Brackwede, which was independent until 1973, a large leisure facility with an extensive range of leisure activities was planned. However, due to more recent findings, this direction was rejected and a natural green corridor was created with unique biotope areas that had developed over time from the abandoned bleaching ponds and meadows. The Luttertal is located in Bielefeld Quelle, south of the
The industrial plant in Brackwede was intentionally abandoned since 1973, due to the local municipality recently cancelled the project of the redevelopment of the area and kept it intact. Till now, a “natural green area developed with very interesting biotope areas, which had evolved over time” at the abandoned site.

Along the 'Green Belt' (Grünen Band) in Bielefeld, which connects several urban grave lands with a continuous path, the organisation of Transition Town Bielefeld created a community garden to replace the permaculture garden in Bleichstrasse. (8) Thanks to its location, apart from the food production, the garden increases the environmental quality of the site serving as a green transition between the grey areas and the city. This function is in line with the overarching mission of Transition Town Bielefeld to promote energy and cultural transition in the city through different initiatives. (7) The community garden initiative was started in 2013 and welcome citizens to take part in the maintenance, planting and other gardening work of the garden or simply to enjoy its beauty since its launch in 2015. The project has a bigger goal towards sustainable development of urban infrastructures and social equity (1,2).

The project aims to create a floating swimming pool on the Odra river, similar to a floating pool in Berlin. The pool would serve as a meeting place and the recreational area, but also as an impressive architectural and floating artwork. The pool would consist of three modules: a relaxation zone; filter module, composed of suitable plants responsible for clearing water straight from the river; and the pool/swimming area, filled with filtered water from the river. The pool should be mobile - made in such a way that by conventional means it could move within the urban waterfront [1].

Restructuring a public derelict land into few private vegetable and fruit gardens. The gardeners practice organic gardening making it more sustainable. This provides foods as well as increasing the soil fertility, and reduction of the soil erosion. This also creates some extra vegetable and fruit market in the city. 20 % of the food produced is donated to the food bank. The project is a community project which also helps to bring people together. Started in April 2012 (Ref 1,4). The project is one of the initiatives by the Greek municipalities allotting land to local citizens with the purpose of increasing food security for the underprivileged, educating the younger generation, and providing their citizens with a retreat from city life (Ref 3).

Lake Rusalka is one of the key elements of Kasprowicz Park, which is a popular recreational area in Szczecin. The shoreline between the Summer Theater and the Japanese Bridge is an attractive stroll. The project aims to improve the functionality, attractiveness and aesthetic value of the coastline and an island on the lake. It envisions going back to the historical tradition of the boats rental as well as includes plans for the revitalization of the part of the shoreline, creation of the Japanese gazebo on the island and construction of mooring berth [1]. In 2020, the project was still on the waiting list in the city’s participatory budget distribution. Local authorities expect its implementation to take place by 2022, the earliest [6].

Since it's founding in 2005, the association "Ermekeilinitiative e. V." has been aiming at the transformation of the Ermekeil quarter, a former military base to a communal, generation-wide and intercultural space with diverse ecological and sustainable use. Since the Federal Office for Defense Administration moved out in 2013, the territory was released for interim use. Together with residents and communities, the association turned the territory into a lively, green and mixed neighbourhood with several initiatives taking place in parallel. The community garden project was one of them (1).
The interim use of the area ended in 2016, some of the buildings of the former military base have been sold on the real estate market. This resulted in the termination of most of the Association's initiatives in the area including the removal of the 100 raised beds of the community garden. Parts of the community garden was relocated to a different part of the quarter, however, since 2018 there is no information on the current working and management of the community garden (2,6).

Before the intervention, the dam was a derelict former industrial and recreational area. (Reference 6) It was transformed into a green recreational park of the southern part of Budapest. 40,000 square metres of grass was laid, 700 trees, 20,000 shrubs and 20,000 perennials were planted. (Reference 4) The park now is a home to a biodiverse population of wild birds. It is one of the few places of the city that have direct connection to the Danube, giving space for strolling, doing sport, playing and relaxing. In 2018, a large-scale development began next to the dam, with the aim of creating a new city center. This would make the park a place for leisure for much greater number of people, but may be detrimental to the ecosystem of the dam. (Reference 6)

The initiative aims to ensure open access to the river Regalica for the local community and to create a multifunctional recreational area there. Given current spatial development plans, the chosen location is the only feasible solution to facilitate public access to the river. The project will address multiple NBS domains as its plans include: building new water stand, fishing place, and an observation deck, developing an ecological and educational path along the riverside, developing recreational spaces for the community including outdoor and cultural activities. The project relates to the long-term brand strategy of the city: ‘Szczecin floating garden 2050’[1]. The architectural plan was accepted and put forward for the implementation in 2019; currently, in July 2020, the project is still in the planning phase [4].