Images of proposed and existing view of 609 Fifth Avenue / 4 East 49th Street
Back in 2023, RJ Capital Holdings and Top Rock Holdings filed plans to convert a 14-story office building at 609 Fifth Avenue into a 29-story mixed-use condo tower comprising 66 high-end residential units. The development at the southeast corner of East 49th Street is located directly across the street from Saks Fifth Avenue and across the avenue from Rockefeller Center.
Designed by Rafael Viñoly Architects, the firm behind 432 Park Avenue, the project will add approximately 93,000 square feet to the former SL Green commercial property that has a multi-level Puma flagship store at its base. The expansion would bring the building's total size to about 226,000 square feet and increase its overall height from 187 feet to 408 feet.
In this article:
A newly released rendering on RJ Capital’s website aligns with approved plans and earlier visuals, showing stacked volumes wrapped in a contemporary glass façade that rises from the existing limestone base.
The building's new program features apartments on the third and fifth through 28th floors, with offices on the fourth and fifth floors. Above the seventeenth floor will be a mix of half-and full-floor residences and a duplex penthouse.
Previously released rendering showing a bird's eye view of the project (RJ Capital Holdings)
The store was hailed as Puma's most technologically advanced store in the world when it opened in August 2019, and Forbes described it as "the best retail store for interactive tech and engagement anywhere" in November 2025. However, as of mid-February 2026, it is temporarily closed due to water damage caused by a burst pipe.
Sectional drawing of the planned development
6sqft delivers the latest on real estate, architecture, and design, straight from New York City.
