Home of the Irish legislature, the Oireachtas Éireann. This was originally the townhouse of the Dukes of Leinster, built between 1745 and 1748 for the FitzGerald family. Architect Richard Cassels (1690-1751) was one of the pioneers of this "mellow" form of neo-classsicism in building design.
The Third Duke of Leinster sold the structure to the Royal Dublin Society, which later in the 19th century added the two additional "rotunda" wings designed by Thomas Newenham Deane. In turn, the new Irish government in 1924 purchased the building, with the thought that this would be a temporary home for the newly independent legislature - but nearly ninety years have passed since then and the Oireachtas Éireann is still at home here.
Leinster House, since 1922, is the home of the Irish parliament - Oireachtas Éireann -, and owes its name to the Dukes of Leinster who used to live in the mansion. There are two Houses in the irish parliament, the Dáil Éireann (the House of Representatives) and the Seanad Éireann (the Senate); both Houses meet in this house.
Tours of the house are possible, theorethicaly, but they are not so easy to "get", unnless you plan your visit well in advance. If you don't live in Ireland you need to contact your local Irish Embassy or Honorary Consular Representative, who will in turn contact the Events Desk of the Oireachtas Éireann and make a reservation for you.
Continue up this street to see the Dail (parliament Building) It was built by the Duke of Leinster who moved from the then fashionable North side to the unfashionable south side to prove that he was so important that where he went fashion and society would follow, so he moved from the fashionable North side to the lowly south side). And he was proven right.
Leinster House is where the Government sit. The Irish Parliament (Oireachtas). The lower house, the Dail, and the upper house is the Seanad. Erected in 1745 for the Duke of Leinster, and designed by Richard Cassels . Two American presidents, John F. Kennedy and Bill Clinton visited Leinster House. For more details check out the website. You can take tours when the house is not sitting, but you must book in advance.
Leinster House is the home of the two houses of the Irish Oireachtas (parliament), the Lower House, the Dáil, and the upper house, the Seanad. Built in 1745 for the Duke of Leinster, the house was sold to the Royal Dublin Society in 1815 who in turn sold it to the State in 1924. Designed by Richard Cassels it was to look like a townhouse from the Kildare Street side and a county house from Merrion Square. It stands between the National Library and the National Museum.
Leinster House is the seat of the Irish parliament. Originally it belonged to the Duke of Leinster hence the name.