Depends on what you order. Everything is ala carte and alcohol can increase the tab. A filet mignon by itself is $45. Add sides and a drink and you're roughly at $80. Plus gratuity. I would plan on about $100 per person with gratuity, if alcohol is kept to one or two drinks per person and you're ordering menu items. Not sure what Thanksgiving specials they may have. Make sure you have a reservation!
800 to 900 hundred
I would plan on close to $100 a person to be honest. My wife and I ate there for our anniversary and it cost $200.
Consider that steaks roughly go for 30 bucks each and sides are separate and can go for 8 bucks each. So its about $900 plus drinks, tax and tip for an evening.
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