[1][2][3] Its headquarters were established at 10–11 Parnell Square in 1900[4] but, due to the cramped conditions, it transferred to 46–49 O'Connell Street, Dublin City in 1975.

[11] Both the Parnell Square property and the O'Connell Street property were transferred to the Fingal County Council on the abolition of Dublin County Council.

These offices were a key location in the events described in the Mahon Tribunal – a tribunal which inquired into re-zoning and planning irregularities in the 1980s in County Dublin.

The area is now part of the Eastern and Midland Regional Assembly.

The motto on its coat of arms was Beart do réir ár mbriathar in Irish which means Action to match our speech.