According to St. Petersburg Fragments (Петербург - фрагменты) Biographical section, the aging architect died in 1920 from starvation that followed the Russian Revolution of 1917 and the Russian Civil War.
The biographical section of St. Petersburg Fragments states that the elderly architect succumbed to starvation in 1920, which was a direct result of the turmoil following the Russian Revolution of 1917 and the subsequent civil war.