A hundred luxury apartments in Ireland’s tallest residential building are still empty a year after being put on the market.

Capital Dock, a 190-apartment, 22-storey built-to-let tower in Dublin’s Docklands was completed in late 2018. The apartments were brought to the rental market in January 2019.

Available records show its 150 two-bedroom units were priced at between €3,500 to €4,000 a month. The 185-square-metre penthouse on the 22nd floor was available to rent...