Exterior work is progressing on 509 Third Avenue, a 35-story residential tower in Murray Hill. Designed by Ismael Leyva Architects and developed by Kahen Properties with Lalezarian Properties under the Third and Thirty Four LLC, the 386-foot-tall structure will span 166,917 square feet and yield 229 units with an average scope of 692 square feet, as well as 8,253 square feet of retail space and a 30-foot-long yard. Charlton Development Group is the general contractor for the project, which is located at the corner of Third Avenue and East 34th Street.

The reinforced concrete superstructure reached its pinnace since our last update in May 2022 and work is taking shape on its exterior behind a dense array of scaffolding and netting. The eight-story podium is largely complete with the exception of the ground floor, and most of the windows appear installed on the lower half of the tower. Waterproof membranes have been installed over the surface of the concrete in preparation for the arrival of the final paneling.

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