The Green Party has accused the Government of doing nothing to solve the housing crisis in Dublin.
The party said there are almost 300 derelict sites within Dublin city boundaries that could be built on, but are not being used.
The party is taking reporters on a cycle of the sites this afternoon.
"There are 282 of them in the city centre," he said party leader Eamon Ryan.
"The Irish Council of Social Housing has also identified a further 800 sites, public land, that could be used to build social housing.
"We need to build housing and we need to build it close to the centre so people don't have to travel too far to work or to school.,
"And the Government's doing nothing on about it - they're not addressing the housing crisis with the urgency it needs."