| Address / Eircode | Aldborough House, Portland Row (Killarney Street), Dublin 1 — D01 R3H3 |
|---|---|
| Building type | Detached Palladian / Georgian mansion (house; later barracks, school, post office depot) |
| Period / date | Built 1793–1799, dated 1796 ("MDCCXCVI") |
| Heritage refs (RPS / NIAH) | RPS 6844; NIAH 50010082 (Rating: National). Associated: 50010083 (south pavilion), 50010084 (former barrack building) |
| Apparent status | Vacant / derelict |
| On Derelict Sites Register? | No — not listed on the DCC Derelict Sites Register (register dated 08 June 2029) |
| On Vacant Sites Register? | Yes — DCC ref VS-0124; added 2017; valued €3.5m (2021). Levy demand confirmed by An Bord Pleanála (Sept 2023); site now under the Residential Zoned Land Tax (since 2025) |
| Owner | Reliance Investments Ltd (Isle of Man; P.J. O'Donnell), since September 2014 |
Aldborough House is one of Dublin's great eighteenth-century mansions and the last great aristocratic house built in the city before the Act of Union. Built 1793–1799 for Edward Stratford, 2nd Earl of Aldborough, it has cycled through use as a private residence, school, army barracks and post-office/telecoms depot, and has stood vacant since 1999. Despite a 2018 grant of permission for a €30–35m office conversion, it remains derelict, on the city's Vacant Sites Register, and listed among An Taisce's most at-risk buildings. [1][2][5]