Development plans for the houses on Dublin's Moore Street where the leaders of the Easter Rising held their last war council have been scaled back by Arts and Heritage Minister Jimmy Deenihan.
Plans for an underground car park underneath the national monument have been refused while the back yards of two buildings are also to be preserved.
James Connolly Heron, spokesman for the Save Moore Street Committee, said the minister's decision amounts to a refusal and that the whole development project will have to go back to official planners.
Independent councillor Nial Ring, chairman of the Moore Street Advisory Committee, welcomed the long-awaited decision by the minister and said the "lanes of history have been preserved".
There was no reaction from developers Chartered Land this afternoon.
The developers had sought permission for an interpretive centre at numbers 14 to 17 Moore Street, but wanted an underground car park and to build within a short distance of the rear of the buildings.
But the minister has refused permission for the car park and the demolition of the rear facades of numbers 15 and 16, as well as any demolition or removal of materials in any of the four buildings that date from 1916.
He has agreed to the demolition of Nos 13, 18 and 19 as they do not contain any pre-1916 elements and said the development of surrounding areas is a matter for Dublin City Council.
The minister said his responsibility was the national monument at numbers 14 to 17.
He added: "I would hope that the applicant can now revise the plans for the Moore Street National Monument, in line with the conditions that have been set, so that an appropriate commemorative centre can be planned for 2016."