The art of closing a deal is best performed within the confines of a good restaurant that has an environment that will draw out your client/potential client or business partner out of their shell and eradicate all the formal office posturing that is done in a normal formal office setting. Below is a list of places to go to for different food choices.
Breslin; located in Ace Hotel, Breslin offers good lamb patty served with red onion,feta cheese and mayo. The place has a British gastropub feel
Dirty French: if you are looking to close a deal with a Middle East client, this is the place to go. Their lamb patty has the North African flavor, serving lamb served with Loire valley goat milk made Bucheron cheese and onions.
Clover Club- located in Brooklyn, the Clover lamb comes in 6 ounces of lamb burger with red onions and goat cheese. One also has choices between potato chips or salad side dishes.
Wolfgang: Park Avenues Wolfgang serves one of New Yorks best steak under architectural marvel, with arched ceilings, its offshoot Peter Luger also offers the same steak quality only that one has to walk from Manhattan to savor their steak.
There is a whole list of places to choose from (https://www.huffingtonpost.com/entry/my-favorite-restaurants-in-new-york-for-business-dining_us_59c2f508e4b0c87def88352a) including Sushi Yasuda, Tori Shin, KyoYa and Ushawakaramu.
La Vara; influenced by Spanish Muslim and also Jewish populace, La Vara offers a chance for one to enjoy all Basque cooking has to offer.
Casa Mono; Go and enjoy all Costa Brava’s culinary has in store.
Take toasted trout toe at ZZ’s intimidate bar with seafood having names like Ceviche.
Wu Ja Lie; a favorite of the China’s US ambassador, this is the place to take your valued Chinese clientele and business partners.
To summarize, these are just few places within new york that one can enjoy food at,they are not strictly for business dining though, you can take a date here too if intimacy is what you are looking for.