We were at the Dolphin from 4/18 - 4/24 and I don't recall any renovations going on. That being said I didn't go to any floors beside the one my room was on (12th) and the lobby and 1st floor. There was a lift parked outside one of the wings for the length of the trip but I don't remember seeing them working on anything (if they were they were so quiet I didn't notice).
Karen