We were scouting cool party spaces recently and caught this view from the 9th floor of Neil Denari’s HL23 on the High Line. Lower floors of the 14-story condo, now nearing completion, are going to feel pretty vulnerable to nose-pressers strolling up the rail-bed park who will be just feet away from their living room glass walls. But on the upper floors, views of the length of High Line will unfurl as alluringly as the Yellow Brick Road. Right now, it’s possible to make out the stretch of emerald lawn section at 23rd Street, waiting for its sunbathers.