The main object of this study is the migrant laneway, which refers to the old community in the city center that attracts migrant workers because of its low rent and good location. This kind of community in urgent need of renewal contains three aspects: spatial, social and the process of renewal. This study regards these three aspects as the main line running through the whole research, and studies the current space situation, residents' life and the problems in the existing renewal process of migrant laneways.

Pattern language is the main analysis method and design tool of this research. By sorting out the patterns in the migrant laneway, these messy spaces are standardized. In addition, pattern language can be used to increase public engagement. This study introduces a new co-design toolkit: pattern buffet. This toolkit helps residents and designers co-design their communities. Work efficiency and program feasibility can be increased while public engagement is being added. More importantly, the result of this design with public engagement is more sustainable and inclusive.

At the social level, this study also proposes a soft strategy to help migrant workers better integrate into the city. The authors reskill these residents towards the opportunities found in a social trend: the senior care industry. While vacancies in the industry are being filled, migrant workers can get longer careers and higher wages to integrate into the city.

Therefore, this thesis develops an approach which enables the urban dilapidated areas to be regenerated in a co-design way. This regeneration framework is very new in the Chinese context. Pattern language, as the most important tool in this study, has been examined for its role and function. However, due to the epidemic, the pattern buffet part lacks practical operation, so the author cannot get feedback from the actual situation, which is also an aspect that this thesis can be further expanded.

While attempting to find an answer to the question of how we could become sustainable and circular by 2050, we discovered that it was quite difficult to even imagine what South Holland, the Netherlands or the world, for that matter, would look like. The questions that arose quite quickly were, among others: how many people will live here then? How will we have dealt and continue to deal with the challenge of sustainability? How will the climate have changed? This resulted in the question that guided the rest of the research: will we still be able to live here? The process starts with the acknowledgment that climate change is a serious threat to us and the way we live. Then there is the realization that it does not make sense to imagine a future in which the economic structures have changed, but the landscape and the way we deal with this threat has not. From this, we continue to envision South Holland in 2100, to see what the landscape could look like and how the circular economy and its activities could exist within it. While drawing up this image, the answers to the questions of flood risk and circularity are not found separately, but sought in the creation of synergies between different sectors and layers. The idea is that the transforming landscape can be a generator of change within the agricultural sector and energy production as well. If the environment changes, the ways in which we use, inhabit or move through it will shift, too. The resulting strategy is about protecting what is crucial, using what is possible and letting go of what we can. This is all striven for in order to reach our goals of having South Holland protected from floods and sea level rise, a circular and sustainable agri-food sector, 100% clean and renewable energy and increased environmental health, all while taking into account the (societal) challenges of the century.