Have been to most of the great restaurants in NYC. Money is not an object, although I do not want to go to Masa.
I am thinking of the following: Adour (although with yesterday's review it's probably a zoo),
Allen & Delancey, Gilt, Commerce, and L'Impero ( have been there with the previous chef)
Would appreciate any feed back or other suggestions.
One more option for you to think about:
Gordon Ramsay at the London Hotel (the main dining room, not Maze).
There is no woman who can resist the bonbon cart at the end...
You mention that you're considering L'Impero which, of course, is the older, less expensive sibling of Alto (which is still on my "go-to" list). We've been to L'Impero twice since Michael White took over the kitchen, and I think his style of contemporary Italian cuisine is delicious. The wine list is excellent, the service is friendly and capable, and the space has understated elegance.
You don't mention when this anniversary dinner will take place, but if the weather is warm, you could sit on L'Impero small, charming and romantic patio, which has a view of the park across the street. While they, of course, take reservations for indoor seating, I'm not sure they do for the patio, and it only has about a half dozen tables.
Happy 35th Anniversary and Buon Apetito!