Two floors, two moods. Rosevale's ground floor is a polished dining room opening onto a garden patio; upstairs, a cocktail room runs late — until 4 a.m. — with an ambitious drinks program and upscale shareable plates. It's a rare Hell's Kitchen find that works equally for an early dinner and a 2 a.m. nightcap, tucked into the theater-district bustle but a notch more grown-up than its neighbors. Come for the meal, stay for the room that doesn't close.