A number of works have had later renovations or extensions. The documents of these are in the Greiner Van Goor Huijten Architects BV office in Amsterdam. The office also has an extensive archive of slides of various works. Of later works there are digital files of recordings. The office also has slide series of lectures and albums with a large quantity of negatives of various works. Also present at the bureau are panels from Carré and the Opera Competition in Oslo.