Pollok House's East Wing represents part of the 1890 extension by renowned architect Robert Rowand Anderson that sympathetically expanded the original Georgian mansion while maintaining its 18th-century character. This wing houses some of the house's most impressive rooms, including spaces that contribute to the authentic Scottish aristocratic atmosphere that made Pollok House perfect for representing Castle Leoch's grandeur in Outlander. The East Wing's design demonstrates how Highland estates evolved over centuries while preserving their essential character and function. Anderson's architectural skill ensured that the extension felt integral to the original Maxwell family home, creating seamless spaces for the elaborate entertaining and clan business central to Highland life. While the MacKenzie residence interiors were filmed elsewhere, the East Wing's authentic period rooms provide visitors with genuine insight into the architectural evolution of Scottish country houses from the Georgian era through Victorian improvements.