Then the GAA can build one.There’s a geography issue here for the GAA, which prides itself as a 32 County Association. There are large stadia in Dublin, Cork, Limerick and Galway but not Belfast. The 6 counties is poorly served in general for GAA stadia.
If the Irish Govt are stumping up more let them build a provincial ground in Letterkenny.
The GAA can sell casement for housing

