Today the Flood tribunal begins public hearings into allegations that money was paid to county councillors in return for their votes on rezoning motions in connection with the Jackson Way lands in Dublin.
The hearings, the first by the tribunal in over a year, are expected to last at least two months.
They are divided into two parts: the first will deal with attempts to rezone the land when it was owned by an offshore company, Paisley Park, in 1993; and the second will examine a second attempt to rezone the land in 1997-98 when ownership had passed to Jackson Way.
The lobbyist, Mr Frank Dunlop, has told the tribunal he paid about £20,000 to politicians to secure the rezoning of these lands.
The politicians acknowledge that they received payments, but say they were legitimate political contributions.
The tribunal will also examine the fate of adjoining lands owned by three businessmen, Mr Brian O'Halloran, Mr Gerard Kilcoyne and Prof Austin Darragh.
These were rezoned during the 1990s.