Dublin City Council faces a challenge to avoid being dragged into the spotlight.
A city report, commissioned by the Government and seen by The Irish News, is set to outline the cost of the planned redevelopment of the Old Firm Stock Yards at the site of a former tram depot.
The council has said it will not spend more than €100m to develop the land.
Council chiefs are also considering whether to go ahead with plans to develop a new railway track at the city’s northern edge.
Mr Brennan said he believed there was no financial incentive for the council to take the view it would be better for the environment if it was not developed.
“I don’t see a financial incentive there,” he said.
“I do think it is in the public interest that the project is not developed at the expense of the environment.”
A senior city councillor said the decision to proceed with the development was not a surprise to him.
“It’s a great opportunity for the city to build on and do something for the wider community,” said councillor John Byrne.
I do see a cost benefit, he added.
He said he hoped to see the development move forward at the same time as the development of the Lough Corry Rail Tunnel.