Looking for a private party luncheon venue in downtown Portsmouth, N.H.? The Library Restaurant is available for your next private function serving groups of up to 140 people. Our Boardroom is available as the perfect size for smaller groups up to 20. So much more than your typical banquet hall rental, The Library Restaurant is elegantly casual, a historic landmark, and award-winning. Experience private party luncheons that will make your next event memorable. Available to rent from 12 pm-2:30 pm with 5 days advance notice. Parties of up to 15 may order off of our standard menu and larger groups may use our function menu.