Passage: In 1909 he converted to Roman Catholicism and married Franziska von Rothermann, the daughter of a knighted manufacturer. The following year, their son Hermann Friedrich Maria was born. His marriage ended in divorce in 1923. In 1927 he sold the textile factory and decided to study mathematics, philosophy and psychology at the University of Vienna. He embarked on a full-time literary career only around the age of 40. At the age of 45,  his first major literary work, the trilogy The Sleepwalkers, was published by Daniel Brody, for the Rhein Verlag in 1931/1932 in Munich.He was acquainted with many of the now well-known writers, intellectuals, and artists of his time, including Robert Musil, Rainer Maria Rilke, Elias Canetti, Leo Perutz, Franz Blei and writer and former nude model Ea von Allesch.

Question: when did maria sell the factory?
1927