Taking this from a social angle, we could as mentioned by another poster give support for doing up old properties.
Do this with additional supports in villages with a small number of people. Support work from home so people can leave the most urban areas, support the services in these areas- school grants, transport, broadband GPs and hospitals. Basically re-invigorate rural Ireland and accelarate population dispersion across a small island.
I'm not sure that would fly politically though as it would de-pressure and probably reduce value all types of property in the main urban areas. Too many vested interests.