※This article is a translated and partially edited version of an article published in January 2026 on “Green Hub in Asia,” operated by the Yokohama City International Bureau. It was produced by Harch Inc., which operates Circular Economy Hub, based on interviews with Yokohama City officials. In Yokohama, efforts to realise a “circular city” are now moving into their next phase. What is driving this momentum is not cutting-edge technology or ambitious targets alone. It is the trust built through dialogue among government, residents, and businesses that is moving the city forward. In the first instalment of this series, we introduced the historical and cultural context that formed the starting point for resource circulation, as well as the resource circulation initiatives that began with the “G30 Plan” (Yokohama’s landmark waste-reduction programme launched in 2003). How has the experience of G30 expanded into cross-sector collaboration and creative initiatives? In this article, drawing on interviews with the Yokohama City officials responsible for each programme, we introduce the cutting edge of Yokohama’s pursuit of a “circular city.” Turning the City’s Memory into Future Value: The Cultural Reuse of Historic Buildings When we think about the circular economy in an urban context, the resources that can be circulated are not limited to physical materials. Could “memory” and “time” also be passed on to the future? Under its philosophy of “city-building that makes the most of history,” Yokohama City preserves and activates historically significant buildings — such as Berrick Hall and the former Oka Family Long House Gate — as part of its parks, keeping their exteriors largely intact. Meanwhile, the Red Brick Warehouse and the Kishamichi Promenade (a former railway corridor including its bridges), which convey the scenery of the old port town, have been sensitively redeveloped with respect for their historical character into