Divesting Irwin Barracks could create space for up to 4000 new dwellings on the site and open the way for a broader investment in housing, services and community facilities in Mt Claremont. Divesting Irwin Barracks could create space for up to 4000 new dwellings on the site and open the way for a broader investment in housing, services and community facilities in Mt Claremont. Credit: Sandra Jackson / The West AustralianDivesting Irwin Barracks could create space for up to 4000 new dwellings and open the way for a broader investment in housing, services and community facilities in Mt Claremont. Councillors said a odour buffer around the Subiaco wastewater treatment plan was the main constraint on developing the barracks site. But the availability of the Irwin site now meant investing in the odour buffer could become financially viable.