MVRDV is an architectural office established in the Netherlands in 1993. After three series of MVRDV Files in 2002, 2007, and 2017, the a+u June 2020 issue - MVRDV FILES 4 - focuses on the office's ambitions to conceptualize sustainable 'future-proof' buildings as described in an essay by its co-founders Winy Maas, Jacob van Rijs, and Nathalie de Vries, and the 23 projects featured. The office prides itself on its visionary ideas of redefining spaces that we use every day. Whether it is the design of the new building or the re-purposing of an abandoned building, MVRDV capitalizes on every creative opportunity presented to rethink typologies and broaden possibilities. Despite challenges faced during the Covid-19 pandemic, the partners came together in a web conference to share with us details about their studio's projects and the experiences they had when collaborating with clients, experts, and the public to find the best strategies.Text in English and Japanese.