Around 1975, at the suggestion of Youke van den Bout, a neighborhood architect on the Western Islands, Cees Nagelkerke joined the Haarlemmerbuurt Residents' Group, which, against the policy of the City of Amsterdam, advocated the rebuilding of the Haarlemmer Houttuinen. In turn, Cees Nagelkerke invited Arne van Herk to jointly develop building possibilities on the empty grounds between the railroad viaduct and Haarlemmerdijk. Thanks to the intense pressure developed by local residents with the help of these architects, the City of Amsterdam decided to rebuild theHaarlemmer Houttuinen. The urban plan between Prinsengracht and Haarlemmerplein was drawn up as a co-production by the architects H.Hertzberger, Youke van den Bout, EGM and van Herk and Nagelkerke, who then also designed the buildings. The acclaimed white houses on the inside of the new city street marked the start of the architectural practice of both Cees Nagelkerke and Arne van Herk. To make the Nieuwe Houttuinen accessible to the Haarlemmerdijk, both architects also designed two white gateway buildings consisting of retail spaces with dwellings above. The empty Haarlemmerpoort was put to use during the same period by visual artist Jenny Hazenberg and her group PARA known for their manifestations as "living works of art." Cees Nagelkerke associated himself with her project Haarlemmerpoort and in this context, again in cooperation with A.van Herk, developed plans for the so-called "creative restoration" of the monumental former city gate. From 1983, operating as an independent architect, Cees Nagelkerke remained active in Amsterdam's urban renewal with the production of plans at a number of dilapidated locations in the Jordaan. A first series was built on Rozenstraat and Laurierstraat and second Laurierdwarsstraat. A second series emerged on Rozengracht, Bloemstraat and second Bloemdwarsstraat. The latter project was named " Hanging Gardens " because of the overgrown pergola construction along the upper edge of the buildings located on both sides of the street. In the residential building on the even side of the Rozengracht also belonging to this series, a retail space was designed on the first floor on behalf of the owners of Wonen 2000, a well-known address for high-quality interior decoration and design. Some years later, on the even side of Rozengracht, another retail space was designed for Wonen 2000/de Kasstoor in a residential building that also contained eight large residences in two floors. Both retail spaces are characterized by an abundance of daylight and an adventurous pattern of circulation through the space and a garden on the rear façade. Finally, the same approach to spatial characteristics recur in the dwoonwarenhuis in building DESIGN 020 on Steigereiland ,IJburg, designed for the same clients and completed in 2014. Cees Nagelkerke also participated in the design and realization of three residential buildings on Java Island under the direction of architect Sjoerd Soeters. In Nieuwe Uylenburgerstraat, between the Uylenburger Synagogue and diamond-cutting factory Boas, now Gassan, an extensive housing complex was realized under the name De Leeuw (The Lion Building), named after the famous bread factory and diamond-cutting factory De Leeuw, which was located there until the Second World War. In the archive of Cees Nagelkerke there is a large collection of works on paper in which designs in development were depicted. This pictorial activity covers the entire period and contains visual material of both realized works and works that were not executed. The latter category concerns the images of the possible construction of the Haarlemmer Houttuinen and the Creative Restoration Haarlemmerpoort (1976-1978) both on loan from the New Institute. For the Haarlemmerplein, Cees Nagelkerke carried out an extensive building study as a follow-up to the works on Haarlemmerdijk and Nieuwe Houttuinen, which, however, did not lead to a realized building plan. An urban plan for a shipyard centrally located in the historic core of Muiden transformed into a residential area was embraced by the Muiden city council in 2004, but to date has not come to fruition and will probably not be implemented or will be implemented in a severely mutilated form. Anno 2017, a design for a self-build lot is in the works for daughter Celine and her husband Bob and children.