Sigrid Zschach was born in Leipzig on 27 July 1929. She graduated with a degree in architecture at the Technical University of Dresden. In the 1950s she moved to Berlin. Kressmann-Zschach married three times and is known to have had several lovers. She became known as a skillful and wealthy career woman but also for her style, blonde hair and good looks.
Kressmann-Zschach's second marriage was to Willy Kressmann, mayor of the affluent Berlin-Kreuzberg district. It allowed her to enter Berlin 'society' and she was able to obtain first hand information about new construction projects. Kressmann-Zschach heard of plans to build a new subway system to Steglitz and produced designs for a 30-storey office block, with a subway station in the basement and Germany's first shopping mall. She secured a DM180 million contract for the scheme, which became known as the Steglitzer Kreisel. The project caused continual scandal as costs escalated and eventually Kressman-Zschach's development company went bankrupt.
Kressmann-Zschach ultimately employed over 300 people. In 1971, when she employed 200 people, it was reported she resisted the election of a works council, complaining that her employees spent a third of their time in discussion rather than working. She sacked three ringleaders and demoted another. However, in the same year Kressmann-Zschach took her staff on an expenses-paid trip to New York, in return for their commitment to stay with the company for a certain period.
- Jerusalemer Kirche, Friedrichstadt, Berlin (1968)
- Steglitzer Kreisel, Steglitz, Berlin (1968–1974)
- Kurfürstendamm Square, Berlin 
- Gerd Nowakowski, Der Kreisel-Skandal, Der Tagesspiegel, 30 May 2005. Retrieved 2012-02-10. Cite error: Invalid
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- Wie Soraya, Der Spiegel, 19 July 1971. Retrieved 2012-02-10.
- Obituary: Sigrid Kressmann-Zschach-Losito, Der Spiegel, 12 November 1990. Retrieved 2012-02-10.