Revised plans are currently being discussed for the development, located on the the site of the former Carlton cinema.
The move comes after Chartered Land was told by An Bord Pleanala to abandon proposals for a 'park-in-the-sky' roof garden, and implement several other changes to proposals for the 5.5-acre O'Connell Street complex.
The planning board said it would give its final verdict on the plans once this is carried out.
Chartered Land's Joe O'Reilly received 16 significant recommendations from the board, which has sought a reapplication before November.
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A spokesperson for the company said the letter "set out a list of concerns".
"We now need to work out satisfactory solutions to answer those concerns and to ensure that the Dublin Central scheme can ultimately achieve planning, and progress to development.
"We have already started discussions on how best to do this with our advisory team," the spokesperson added.
Dublin City Council planners granted permission for commercial and residential units at the development last year.
However, this decision was appealed and later followed by a public hearing in April.
The original submission made provisions for 125,000 square metres of mixed-use space.
The site, which corners O'Connell Street, Parnell Street and Moore Street, would have included a 'park in the sky', a John Lewis department store, 98 shops, 64 apartments and 2,868 square metres of office space.
Proposals were also made to relocate two protected structures; the 19th-century O'Connell Hall, and the facade of the former Carlton cinema and the insertion of a new plaza on O'Connell Street.
In the letter to Mr O'Reilly, the appeals board described the site as being generally "suitable for the type of development proposed".
(PR/BMcc)
