He founded the latter after the first World War (1920) with two cousins from the Bunge side of the family Alfred and Felix Rhodius on Keizersgracht 119–121, Amsterdam.

The loan included works by Paul Cézanne, Jean-Baptiste Corot, Edgar Degas, Forain, Manet, Renoir and Henri de Toulouse-Lautrec.

D.C. Roëll had requested the artworks for the exhibition '100 years French Art' to be held 2 July till 25 September 1938 at the Stedelijk Museum.

Still in the old building of Museum Boijmans 'Het Schielandhuis [nl]' Franz Koenigs showed in 1934 his Dutch drawings from the 15th, 16th and 17th century.

The Delbrück Banks through Rhodius Koenigs had outstanding orders in Britain, which were regarded as reparation payments of World War I.

Those outstanding orders could no longer be paid for in Britain nor could the goods be delivered to Germany, which blocked Rhodius Koenigs trading.

Lisser & Rosenkranz, Tillmann and Altmann, Jewish owned Banks from Hamburg, opted to participate in Rhodius Koenigs capital expansion.

The loan thus served two purposes, it allowed the German Jewish investors to circumvent the restrictions on financial investments outside Germany and it provided Rhodius Koenigs with liquidity.

Franz Koenigs, in reaction to his son's loss, trying to save what was left of his family, applied for Dutch citizenship.

Franz Koenigs by obtaining Dutch citizenship thus took a next step in saving his family and his art-collections from the Nazi-regime, in particularly from Hitler who at that time was the world's foremost art buyer.

On 2 April 1940, the Jewish owned bank Lisser & Rosenkranz liquidated in order to be insolvent before the Nazi invasion.

Due to the thread of an acute invasion the Jewish owned bank sold the collection for a fraction of its worth to one of the patrons of the museum Boijmans.