The site currently accommodates an existing 6 storey office building (c.11,654 sq. m), over 2 levels of undercroft car parking at lower ground and ground floor. The proposed development consists of the internal refurbishment and reconfiguration of the existing office building and associated lower ground and ground floor car parking areas; The construction of a new building extension from lower ground to 6th floor levels to existing Block B eastern elevation; The construction of new building extension from 1st to 6th floor levels to existing Block A northern elevation over lower ground and ground floor levels; The extension northwards of the existing setback penthouse at 5th floor of existing Block C fronting Baggot Street Upper; The construction of a new office penthouse, replacing existing caretakers apartment and plant room, at roof level (6th floor) over existing Block A fronting Fleming Place; The replacement of all existing building facades; the redesign of the existing ground floor entrance at Baggot Street Upper and the existing lower ground floor entrance at Fleming Place to create new double height entrances, which will each connect via a new triple height internal ‘link gallery’ atrium along the eastern flank of Block B that forms part of the proposed building extension at this location; 2no. ESB sub stations, 3 switchrooms, bin storage, plant and store rooms, at lower ground and ground floor levels; and hard and soft landscaping works within the site curtilage. The proposed development will result in an increase in overall gross floor area of the existing building from c.11,654 sq. m to c. 17,136 sq. m.