The clients for this block of workers' houses on the Spaarndammerplantsoen were K. Hille and G. Kamphuys. After the 1911 'Hillesluis', De Klerk received this commission directly and not through the Baanders agency. There is documentation available, KLERDossier5 and 6, regarding the housing complex on the Spaarndammerplantsoen (first, second and third block).