The request illustrates the extent of the breakdown in relations between the BBC and MacCormac's practice MacCormac Jamieson Prichard (MJP) after the firm was sacked in late 2005 by contractor Bovis, to which it had been novated on the scheme.
And the BBC has withheld many of the documents MacCormac was keen to see, citing commercial reasons.
MacCormac had wanted to find out more details of his appointment and dismissal from the project. It is understood that he is now considering taking the case to the Information Commissioner.
The relationship between the BBC and MacCormac, which was previously very good, had contributed to the BBC's victory in the RIBA's Client of the Year Award in 2003.
However, this relationship now appears to have broken down.
MacCormac's departure from the Broadcasting House scheme's second phase and the subsequent replacement with Sheppard Robson was mired in secrecy and controversy.
To date it is unclear whether BBC bosses actively sanctioned Bovis' decision to dispense with MJP's services.
MacCormac tries to find out details of BBC sacking