Enterprise cluster The Digital Hub is seeking partners to help develop a large site on Dublin's Thomas St that could add as much as 300,000 square feet of space.
Office space is tight at the cluster, which is spread across eight buildings in the Liberties area of Dublin.
The proposed development would be mixed-use rather than offices only.
"There's a lot of interest already in the site, a lot of bodies have been looking at it and coming up with some good ideas," Digital Hub chief executive Gerry Macken told the Irish Independent.
The Hub is preparing a development brief for the site that it will pitch to the market shortly.
The cluster also has plans for the refurbishment of a 19th-century grain store building, adding an additional 10,650 square feet of office space to the cluster.
The refurbishment is scheduled to be finished in the second half of 2015.
Thirty-five new and returning companies set up offices in the Hub last year, creating 150 new jobs.
The Hub expects the trend to continue this year and says more than 700 people will probably be employed there by the end of the year. Almost 650 people are employed there now.
Mr Macken said the Hub is "seeing demand again for a whole range of new jobs and skillsets in the digital tech sector from within our digital enterprise community".
The Digital Hub was set up by the government in 2003 and is designed to be a "hothouse" for technological development and innovation.