Lesnoy Ave., 21-1, Saint Petersburg, Russia, 194044
The light-colored three-story stone building is a horizontally elongated free asymmetrical volumetric-spatial composition. The main facade of the building faces the courtyard, featuring a complex broken contour plan and whimsical curvilinear outlines. There are no repeating elements in the facade decoration. Various windows of different sizes and shapes, plaster of different textures combined with hewn and roughly chipped stone in the plinth treatment play a significant role in creating the image.
The side facade facing the avenue has a flat symmetrical composition with floor-by-floor rows of three rectangular windows. Only the glazed bay window, decorated with two herms, stands out.
The mansion on the avenue side is united with the People's House by an elegant metal fence on a granite plinth, built in 1904 according to the design of architect Meltzer.

In 1905, Marta Ludwigovna Nobel married the well-known Russian military doctor Georgy Oleynikov—of humble origin and much older than herself. This was an unconventional act for the "exclusively Swedish Nobel family." After marriage, Marta began studying medicine, graduated in 1909 from the St. Petersburg Women's Medical Institute, and worked as a surgeon at the Obukhov Hospital.
In a difficult family situation, Emmanuel Nobel supported his sister. In 1910, he expanded his mansion according to the design of architect Lidval to accommodate his sister's family—in the right wing at the back of the courtyard.
After the October Revolution, from 1918 until his death in 1932, the bachelor Emmanuel Nobel lived in Stockholm with his sister Marta and brother-in-law Georgy.
Sources:
https://www.citywalls.ru/house10158.html
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