Commercial real estate values have dropped in Dublin in the last two years courtesy of sluggish demand post-Covid and macroeconomic challenges like higher interest rates. But by how much is a live issue playing out in a €13.8 million negligence lawsuit over the Greenside Building, under construction off St Stephen’s Green. Described in promotional material as “iconic” in its design, the nine-storey office block on Cuffe Street is at the centre of a Commercial Court row over allegedly defective concrete supplied in its construction. The developer KC Capital Property Group Ltd, founded and run by David Kennan, is suing its…