Exterior work is progressing on 517 West 29th Street, a ten-story residential building in Chelsea. Developed by Churchill Real Estate Holdings and designed by Ben Hanson Architect with Rand Engineering and Architecture as the architect of record, the 135-foot-tall structure will yield 56,160 square feet with 60 condominium units and nine private outdoor parking spaces. The project site is located between Tenth and Eleventh Avenues near the High Line and Hudson Yards, on a plot that once housed a six-story brick building that Six Sigma purchased for $54.75 million.