Developed by Alf Naman and currently in construction, HL23 is a 14 floor condominium tower that responds to a unique and challenging site directly adjacent to the High Line at 23rd street in New York's West Chelsea Arts district. Partially impacted by a spur from the elevated tracks that make up the High Line superstructure, the site is 40' x 99' at the ground floor. The site and the developer demanded a specific response, yielding a project that is a natural merger between found and given parameters and architectural ambition. For the client, the question was how to expand the possible built floor area of a restricted zoning envelope. For the site, a supple geometry must be found to allow a larger building to stand in very close proximity to the elevated park of the High Line. Together, the demands produced a building with one unit per floor and three distinct yet coherent facades, a rarity in Manhattan's block structure.