Thanks for clarifying, that makes a lot more sense now.
I would do Clinton St Baking Company (if you get there by 8:30am, you'll probably be one of the first seated, and beat the crowds, get the pancakes), Locanda Verde (breakfast from 8-10 on weekends, brunch afterwards, get the sheep's milk ricotta & a baked egg dish), Breslin (love their cocktails, pastries, and English fry ups, and brunch starts at 7am). Perhaps Maialino -- their front room opens at 8am, not sure which menu they would serve, so I'd call and ask, but they do a good breakfast/brunch. Out of those, Locanda Verde and Maialino take reservations, whereas the Breslin and Clinton St do not. These are probably four of the best breakfast & brunch restaurants in town, regardless.
Towards the bottom of this post is a bigger list of places with early breakfast & brunch.
377 Greenwich St, New York, NY 10013
20 W 29th St, New York, NY 10001
2 Lexington Avenue, New York, NY 10010