Last night at Luna’s first New York City gig in 10 years — an outdoor show at Northside Festival, off of McCarren Park — one of the guys pointed to a concrete tower rising near the Williamsburg waterfront and directed everyone’s attention to “the PanAm building.” Or was it the MetLife building? The behemoth rising above Wythe Avenue is actually the William Vale hotel, slated for completion early next year. Though it currently stands at less than half its expected height, it’s already pretty impressive. And it’s even more dizzying up close, as we saw during a recent hard-hat tour. From its ginormous basement ballroom to the offices overlooking the longest rooftop hotel pool in New York City, we got the inside look at Williamsburg’s new luxury hotel.