Private Dining Restaurant Options for a Party of 13

Looking for a restaurant with private dining options for a party of 13. I'm struggling to find something. It's either an expensive restaurant with a very high minimum upfront payment, or our party isn't big enough for a private dining room. This is a surprise birthday party and people are flying in so I'm hoping to find something fun/affordable/private. I found one place that offered $45/person tapas for events and it looked like a ton of fun, but it would have been split up between multiple tables in the main restaurant and I think that would be awkward and people would feel left out.