Every time I visit Chicago, I love taking one of the tours offered by the Chicago Architecture Foundation. These tours are excellent, run by enthusiasts, and take different forms. There are walking tours, an excellent riverboat tour, and several other options, as well. By far, it's the single best sightseeing tour of Chicago I've ever had.
Is there a New York City equivalent? I am having zero luck after a year, on and off, of searching. Short of buying a camera strap and a tour book, is there some sort of official architecture society tour that a sightseer or recent transplant could take of New York City? So far, I've found found food tours -- which, while awesome, aren't quite what I'm looking for.