 Bolshevik administration retained him in his office, and for some time Mashkov acted as the City Architect, engaged mostly in maintenance of the city in the middle of a civil war.In 1929, Mashkov and sculptor Nikolay Andreyev erected the neoclassical monument to Aleksandr Ostrovsky near Maly Theater.Mashkov continued surveying memorial buildings (some of them already scheduled for demolition) and headed the restoration of Pashkov House (then known as Rumyantsev Museum, later Lenin Library and Russian State Library).