Sinn Fein's Martin McGuinness has started working in a suite of offices which used to be allocated to Northern Ireland's deputy first minister.
The party said it had taken up an offer of additional resources to assist its work on the new Stormont Programme for Government Committee.
However, it said it was not using the old deputy first minister's office.
The DUP is considering if it will take up accommodation offered to the four main parties by the secretary of state.
Sinn Fein has been allocated a number of offices in the suite which used to be occupied by Seamus Mallon and Mark Durkan when they were deputy first ministers.
The work is being led by Mr McGuinness.
The additional resources mean three extra advisors who will be paid the equivalent of £45,000 per year.
The DUP has insisted neither Mr McGuinness nor DUP leader Ian Paisley should have any trappings of office.
Fresh elections
The DUP said it had yet to decide whether to take up the extra resources.
DUP sources said in the future the first and deputy first minister's offices are likely to be in Stormont Castle not the assembly building.
Sinn Fein nominated Mr McGuinness as deputy first minister when the assembly met on 24 November.
DUP leader Ian Paisley has said that if all his conditions are fulfilled he will accept the first minister's post after a spring election.
The deadline for devolution is 26 March, with fresh assembly elections set for 7 March.
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