Richard Cassels designed the house for James FitzGerald, Earl of Kildare, later the 1st Duke of Leinster, and it was built from 1745 to 1748. The infobox calls the style Georgian, Palladian, and the body credits Isaac Ware with later elements and the interior. The house was renamed Leinster House in 1766 when the Earl became Duke.
The infobox lists Ardbraccan limestone, while the body says granite from Golden Hill quarry in County Wicklow was used on the Merrion Street side, a quarry exhausted by 1850. Repairs used granite from Ballyknockan quarry. The article gives no dimensions.
The 3rd Duke sold the house to the Royal Dublin Society in 1815. Michael Collins hired the complex as a temporary Dáil chamber in 1922, and the state bought it in 1924. It houses the Oireachtas. An office block, Leinster House 2000, was built in 2000, and restoration ran from 2017 to 2019. The article gives no public access arrangements.

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