Dear Bruce,
According to the City Archive of Amsterdam, Max Jonas and Toby Theodor Bauer lived at this address. On the Archive Card of Toby Theodor Bauer it is written that he died in Amsterdam on April 19 1944 while having the name Theo de Boer. For both Theo de Boer (Dutch for the German word Bauer,(Farmer )) (here) and Toby Theodor Bauer (here) a death certificate can be found.