The Radisson Blu Royal Hotel on Dublin's Golden Lane has applied for permission to add a 10-storey extension which will result in an extra 103 bedrooms being added to the 4-star hotel.
The Irish Independent says the plan will involve extra eight storey over two storey basement extension which, when completed, will increase the hotel's capacity by 40% to 255 bedrooms.
The value to the hotel is estimated to be in the tens of millions in extra revenue each year, should the plans be approved.
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Other features of the plan include the creation of a spa and wellness treatment centre, a gym and juice bar, as well as extending the hotels function room.
Galway developers the Rhatigan Group, owners of the hotel, had reported the Radisson's pre-tax profits as increasing to €775, 946, while its gross profits went up from €8.67 to €9.18 million by the end of August 2014.
The Irish Tourism Industry Confederation has previously reported that there is a need for an additional 30 hotels in Dublin by 2020/21. This gap in the market has resulted in the Dublin City Council having to deal with a large number of applications from investors trying to get their foothold into this booming market.