The Ronan Group Real Estate has started construction on the Waterfront South Central development in the Dublin's Docklands. 

The €1 billion project includes a 44 storey tower and 1,000 residential units - 100 of which are for social and affordable housing. 

It will be the tallest building in Dublin and the greenest building in Ireland when it is finished, according to the developers. 

The Waterfront site is the latest on which Johnny Ronan's firm has collaborated with its funding partner Colony Capital. 

Other developments the two companies have partnered together on include Fibonacci Square, the 370,000-square-foot Europe, Middle East and Africa headquarters for Facebook, Spencer Place, Salesforce's 530,000-square-foot European headquarters, and Vertium, the 172,000-square-foot Dublin headquarters for Amazon.

"The core of the RGRE and Colony partnership is a vision for modern living and working spaces that are built to meet and exceed the demands of the world's most dynamic and forward-thinking occupiers," said Rory Williams, CEO at RGRE. 

"In line with these themes, and in working closely with the IDA, Waterfront South Central is specifically designed to respond both to Dublin's immediate and future needs and to lead the way for the city's development," he added.