It was owned by Nicholas Mikhailovich-Bimbo-after his father's death, and several of his family-Serge Mikhailovich, George Mikhailovich-lived there when in the capital. Once, purely on a whim, I went through the archway from the Millionnaya and sort negotiated my way in to see a bit of it, though not very much, unfortunately-I've love to see more, and floorplans, too.
Greg King