People who opposed the rezoning of lands for development in the 1990s were branded "environmental terrorists" by a former member of Dublin County Council, the tribunal heard.
Former councillor Mr John O'Halloran had referred to opponents of rezoning in these terms at a council meeting, Mr Frank Dunlop said.
Despite his stance, Mr O'Halloran did not attend two council meetings in 1991 and 1992 when the rezoning of lands owned by the controversial Paisley Park/Jackson Way was being considered.
Afterwards he told Mr Dunlop, who had paid money to several councillors to support the rezoning motion, he would have supported the rezoning of the lands if he had been paid to do so.
Mr Dunlop said Mr O'Halloran approached him some time after the rezoning motion was defeated in 1992 and "complained that he was getting nothing and others were coining it". Mr Dunlop's response to him was that he hadn't asked for any money.
However, Mr Dunlop said he took into account that Mr O'Halloran would have supported the motion when he subsequently made payments to him. He gave him money in small amounts totalling "not more than £5,000". The money was paid in respect of his support for various developments.
In addition, he recalled making one payment of £2,500 to Mr O'Halloran in 1996 to help him contest a by-election in which he stood as an independent. He said Mr O'Halloran asked for this money and when he did so, he pointed out he had been extremely helpful "in relation to a number of matters, one in particular".
Counsel for the tribunal, Mr John Gallagher SC, said Mr O'Halloran, who denies receiving improper payments, had recently been in touch with the tribunal to indicate he now recalled receiving a further £500 from Mr Dunlop in the period 1991-1993, in addition to the £2,500 he previously admitted receiving. This was also a political donation and was unsolicited, he claimed.
Mr Dunlop also said he paid a bribe of £2,000 to Cllr Colm McGrath in return for his vote on the motion to rezone the Carrickmines land. The money was paid over in Mr McGrath's office some time after the motion was taken at Dublin County Council.
Mr Dunlop said the actual transmission of the money, in a bundle of £20 notes, was a "swift exercise" during a meeting at which the two men discussed a number of issues. "We agreed a sum of £2,000 on the Paisley Park vote, and that was it." The witness said he had no doubt whatsoever that the payment was an inducement or bribe.
Mr McGrath, who was a Fianna Fáil councillor at the time and is now an independent, has emphatically denied that he received any corrupt payments as described by Mr Dunlop.
He has told the tribunal he did receive a number of "unconditional political donations" from Mr Dunlop in response to fund-raising requests. These sums ranged from £500 to £2,000 and he used the money to defray election expenses and the costs of running a constituency office.
Asked about this, Mr Dunlop said he made two legitimate political donations to Mr McGrath. He gave the councillor a £500 cheque for a golf classic in May 1999, and paid a £1,000 cheque to one of his companies in April 1992.