In a 1946 interview, he told Marie Louise Doudart de la Grée that he owned 52 houses and 15 country houses around Laren, among them grachtenhuizen, beautiful mansions along the famous Amsterdam canals.
I et interview fra 1946 fortalte han Marie Louise Doudart de la Grée, at han ejede 52 huse og 15 landsteder i egnen omkring Laren, blandt disse grachtenhuizen, dvs. smukke palæer langs de berømte Amsterdamkanaler.