Mansion House, Official residence building in Dublin, Ireland

Mansion House is the official residence of the Lord Mayor of Dublin, standing on Dawson Street. Joshua Dawson built it in 1710 in the Queen Anne style, in brick with a stucco finish. Its symmetrical seven-bay front has a projecting three-bay centre carried on a pair of Ionic columns, sash windows with stone surrounds, and a balustraded parapet with a modillioned pediment.

The wealthy developer Joshua Dawson had the building constructed in 1710 as his private house and sold it five years later to the city authorities. Since then it has served continuously as the living quarters and office of the civic leaders, making it the oldest continually used mayoral residence in Ireland.

The serving mayor lives in the upper-floor apartments during the term of office and receives political guests and delegations there. The reception rooms host official ceremonies, state receptions, and city council gatherings where the centuries-old tradition of the office remains visible.

Tours lead through several ground-floor rooms, including the oak-paneled chamber and the drawing room with historical furniture. Guides explain the architecture and function of the spaces, while the private areas on the upper floor remain closed to the public.

The Round Room, added in 1821 for a reception of King George IV, hosted the First Dáil on 21 January 1919, when the Irish Declaration of Independence was proclaimed there. The Anglo-Irish Treaty was ratified in the same room in 1921, and joint sessions of the Dáil and Seanad marked the 50th and 100th anniversaries in 1969 and 2019.