The riverside buildings added over time
In 1764 Felten was ordered to add a wing east of the Winter Palace, finished two years later as the south pavilion of the Small Hermitage. In 1767 to 1769 de la Mothe built the north pavilion on the Neva bank; eight years later the two were joined by a gallery, and the paintings hung in those galleries. That whole Neoclassical group came to be called the Small Hermitage.
The collection outgrew the building. In her lifetime she took in 4,000 Old Master paintings, 38,000 books, 10,000 carved gems, 10,000 drawings, 16,000 coins and medals, plus two galleries of natural-history specimens. In 1771 she asked Felten for another building, completed in 1787 — the Large Hermitage, also called the Old Hermitage.
In 1838 Nicholas I asked the German architect Klenze for a building open to the public. The Shepelev Palace and Imperial Stables were demolished to free the ground; from 1842 to 1851 Stasov and Efimov supervised, folding in Quarenghi's wing with the Raphael Loggias. The New Hermitage opened on 5 February 1852.