THE decision on whether to demolish Liberty Hall and replace it with a 22-storey office block won't be known for at least four months.
There may also be an oral hearing into the case, with four objections to the SIPTU bid to build a tower 35pc higher than Liberty Hall on the site.
Those lodging appeals against the decision by Dublin City Council to grant SIPTU planning permission for the project include Irish Life Assurance, Valerin O'Shea, Ian Lumley and An Taisce.
An Bord Pleanala says the case is due to be decided by July 23. In February, the city council set down 19 conditions, including a further alignment of the northside of the building, particularly on the upper levels.
The most eye-catching elements of the SIPTU plan include a four-storey heritage centre at the top of the building, with a public skydeck accessible by a glass-fronted sky lift.
A conference centre and theatre are also proposed with 17 storeys of offices.
The council also wants the proportions of the four-storey base of the building to be changed to be more cognisant of the existing streetscape. Many of the objections cite the height of the proposed tower.
The planners also wanted "wind-tunnel" tests, details of all external materials, finishes and design changes "to ensure the provision of a building of exceptional architectural character and quality" on the site at Eden Quay.
SIPTU maintains that the existing 60-metre building, which dates from 1965, is no longer functional.
Liberty Hall has historic links to the 1913 Lockout and the 1916 Easter Rising and was Dublin's first skyscraper.