Earlier this month, a substantial Victorian residence, set on 3.7 acres and overlooking one of Dublin’s most desirable stretches of coastline, came on the market. Dún Mhuire, in Killiney, has long been used by the Franciscan Order as a centre for study and residence. It sits in a location that most cities would consider ideal for housing: in an established and well-to-do neighbourhood, a short walk from a Dart station and very close to the beach. In a city with a housing deficit of the order of 100,000 homes relative to underlying need, sites like this are extraordinarily rare. This…