[2][3] The Cologne headquarters around the (former) Gereonshof street was converted into residential and commercial space as the Gerling quarter.

[8][9] On 23 October 1909 Gerling founded a fire insurance company, Rheinische Feuerversicherungs-AG, which collaborated with Kronprinz Versicherungs-AG, merging with it in December 1936.

After Robert Gerling died shortly afterwards in January 1935 as a result of acute pneumonia, he did not leave his three sons a legally valid will.

However, according to Senate Subcommittee Testimony in 1946, the retirement of Dr. W. S. Kisskalt, vice president of the Munich, from the board of the Union in 1939 could not save the company from being blacklisted, nor did the retirement of Mr. W. Forstreuter of Berlin, Robert Gerling of Cologne, and Hans Harney of Duesseldorf prevent the blacklisting of the Universale of Zurich as a subsidiary of the Gerling concern.

[17] Premiums collected during the Nazi occupation of France were, the Senate testimony stated, transferred to Gerling.

In the 1950s, with the participation of the architects Hentrich and Heuser, the office buildings in the direction of Gereonshof (near Friesenplatz) were extended in a complex manner.

The completion of the Gerling high-rise in Cologne's Gereonsviertel on 25 January 1953 set an urban development accent.

At the instigation of Hans Gerling, Arno Breker, Hitler's favorite sculptor,[21] contributed to the design.

[27][28] In July 1973, the investigative journalist Günter Wallraff went undercover in Gerling for two months as a porter and house messenger and reported on "anachronistic working conditions, arbitrary termination, and whims of the noble superiors to whom the 'little employees' in the patriarchal insurance company were at the mercy".

The sale brought 210 million DM into the comparative assets of the Herstatt bank, which Gerling paid voluntarily to enable a compulsory settlement.

In October 2001, the Gerling Ring-Karree near the Friesenplatz, based on a design by the architect Sir Norman Foster, was completed and occupied near the company's headquarters at Gereonshof.

The new owner Talanx sold the Gerling building in Cologne's Gereonsviertel to Frankonia Eurobau AG in December 2006.

New premises for the life insurance sector were moved into the renovated Rheinhallen at the Cologne-Deutz exhibition center in September 2009.

The Gerling Quarter was sold in September 2012 by Frankonia Eurobau AG to the previous 50% shareholder Immofinanz.

Neven-Dumont pointed out that Gabriele Neven DuMont bought the land on 23 March 1941, three years after the Gerling Group had acquired the land from the Jewish Brandenstein family, paying RM 255,000, more than five times the amount that Gerling had paid in 1938.