The New Tretyakov houses an extensive and important collection of Russian art, including seminal work from Malevich, Kandinsky, Chagall, and Soviet artists such as Aleksandr Deyneka and Vera Mukhina. The original design by N.P. Sukoyan and Y.N. Sheverdyaev was approved in 1964 and completed in 1983, and consists of multiple exhibition halls; the combined program adds up to a total floor area of 61.091m². It is the largest museum building in Russia, marked by a number of improvisations and additions that have been added over time, fragmenting the vast hallways and grand exhibition spaces into clusters of smaller rooms.