Known as Sergei’s Courtyard, the compound was built in 1890 by an uncle of Tsar Nicholas II. All of the building material for the Renaissance-style construction was imported from Russia. For more than a century, it has stood as an architectural wonder, the main tower especially looking as though it were taken from a chessboard. The compound’s splendid gardens, where wealthy Russian pilgrims and dignitaries were once entertained, have also been restored.

Renovation of the compound’s 22-room hotel took six...