Currently under construction is the stunning High Line 23 (or HL23). American architect Neil Denari has designed a 14-level condominium tower located right next to the High Line at 23rd street in New York City’s Chelsea district. The site is only 40′ x 99′ at the ground floor but the floor plan grows as it goes up. The building offers one unit per floor and three different facades. Built to meet LEED Gold Certification environmental standards, it will be the subject of an entire museum exhibition.