Related Companies has locked down Thomas Heatherwick and Robert A.M. Stern to design their two tower Hudson Residences development. Thomas Heatherwick, who also designed the Vessel and public square at Hudson Yards, will design the tower at 515 West 18th Street while Robert A.M. Stern will design the portion at 555 West 22nd Street. Hudson Residences is expected to feature 180 apartments that range from 1 to 4-bedroom layouts. The Heatherwick design features a "modern interpretation of the bay window," which are bulbous round floor-to-ceiling glass as seen in the renderings, outfitted in custom masonry façade. The 18th street project will feature 2 buildings which straddle the High Line featuring a 10-floor east tower and 22-floor west tower. The total development will cover 425,000 SF and feature 17,000 SF of retail space and 175 parking spots. Amenities include a state-of-the-art fitness center, spa, residents' lounge, 24-hour security, a link to the High Line, etc. The 22nd Street location will rise 22 floors and will feature 141 condos which will also feature a state-of-the-art fitness center, spa, on-site parking and resident's lounges. Related Companies purchased the 18th street site in 2014 for a record $205 million and executive architects SLCE filed construction permits which have since been approved. Completion of both towers is expected by 2021.