Steiner's lecture activity expanded enormously with the end of the war. Most importantly, from 1919 on Steiner began to work with other members of the society to found numerous practical institutions and activities, including the first Waldorf school, founded that year in Stuttgart, Germany. At the same time, the Goetheanum developed as a wide-ranging cultural centre. On New Year's Eve, 1922/1923, the building burned to the ground; contemporary police reports indicate arson as the probable cause. Steiner immediately began work designing a second Goetheanum building - this time made of concrete instead of wood - which was completed in 1928, three years after his death.