Eduard Fraenkel and his son Siegbert Martin founded the „ Akademisches Antiquariat Eduard Fraenkel“  at Artilleriestrasse 13 in Berlin on January 1, 1905. One year after the resignation of Eduard Fraenkel, Josef Altmann joined the antiquarian bookshop on January 1, 1914 as a co-owner, which from then on bore the name Akademisches Antiquariat Fraenkel & Co.“. In 1919, Siegbert Martin Fraenkel decided to leave the business and founded a new company under the name „S. Martin Fraenkel, Fachunternehmen für Buch- und Kunstversteigerungen“ a new company at Lützowstrasse 14.

After the family had to move out of their apartment at Hofgartenweg 7 on December 31, 1939, and was housed in a barrack, they moved into the house at Am Zieger 10, where the house owner Friedrich Lustinetz provided them with accommodation. On September 20, 1942, Leopold's mother Julie Popper (née Knöpfelmacher, *October 30, 1866 in  Uherský Ostroh [Eng: Hungarian Ostra]) was deported with 876 other people on transport number XVI/1 from Weimar to Theresienstadt. She was assigned the identification number 636. She died on February 27, 1943.

Around 1931 - probably after the wedding with Hildegard (née Gäbelein) - Leopold Popper (*1903) moved into the apartment at Hofgartenweg 7 and had a daughter with his wife. Leopold Popper brought his mother Julie Popper (née Knöpfelmacher, *30 October 1866) from Vienna to Greiz and let her live with him and his family. During the National Socialist dictatorship, Mr. Popper worked at the Jahn company in Greiz, where he was segregated from his colleagues. On December 31, 1939, the Popper family had to move out of their apartment.

The origin of the sanatoriums Mainschloss and Herzogh he lies back in the year 1861.damals founded the am  17.12.1816  born son of the Bayreuth merchant Jacob Würzburger and his wife Philippine, née. Romberg -  Dr. Simon Würzburger in Bayreuth in the Dammallee the "Asylum für nerves and gemütskranke Israeliten ". In the 1870s, the asylum moved to the house at Erlangerstrasse 19. In 1894, the newly built private sanatorium „Herzoghöhe“ was opened in the Herzoghöhe corridor by Dr. med.Simon Würzburger together with his son Dr. Albert Würzburger.