RJ Capital And Top Rock Plan 29-Story Condo Tower At 609 Fifth Avenue Conversion

• RJ Capital Holdings and Top Rock Holdings plan a 29-story conversion and expansion
• Project will deliver 66 condominium units totaling nearly 226,000 square feet
• Rafael Viñoly Architects leading design, doubling building height to 408 feet

What the conversion plan means for Fifth Avenue assets

A major office-to-residential conversion is moving forward at 609 Fifth Avenue, signaling continued momentum for repositioning aging office stock in prime Manhattan corridors. The joint venture between RJ Capital Holdings and Top Rock Holdings aims to transform the existing 14-story office building into a 29-story mixed-use tower. The redevelopment will more than double the structure’s height and significantly expand its usable space. Located at a prime Fifth Avenue corner, the property stands to benefit from both strong retail exposure and long-term residential demand.

What the design changes mean for value and positioning

The redesign by Rafael Viñoly Architects replaces the building’s older prewar façade with a modern glass curtain wall, introducing a more contemporary identity aligned with luxury residential trends. The project will incorporate terraces, balconies, and greenery throughout the upper floors, adding premium features that support higher pricing for condo units. Retail at the base, currently occupied by Puma, will remain intact, preserving income while allowing the upper floors to transition into higher-value residential use.

What the unit mix signals for the luxury market

The building is planned to deliver 66 condominium units, with layouts ranging from half-floor to full-floor residences. This suggests a focus on larger, high-end units rather than dense multifamily configurations. Apartments will begin on the third floor, with a mix of office and residential uses in the lower levels before transitioning to residential above. This structure allows the developers to balance near-term income with long-term upside tied to luxury condo sales in a globally recognized retail corridor.

What this means for Midtown East conversion trends

This project reflects a broader shift across Midtown Manhattan, where developers are increasingly targeting older office buildings for residential conversion. Rising vacancy in office space, combined with strong demand for well-located housing, has made these conversions more financially viable. Proximity to major transit hubs like Rockefeller Center and Grand Central further strengthens the case for residential repositioning, especially for buyers seeking convenience and prestige locations.

What this means for investors and landlords

The 609 Fifth Avenue project highlights how developers are unlocking value by combining vertical expansion with office-to-residential conversion. For investors, the strategy is clear. Target well-located but underperforming office assets and reposition them into high-end residential or mixed-use properties. As more of these projects move forward, Fifth Avenue and Midtown East are likely to see continued evolution, with residential uses taking a larger share of traditionally office-dominated space.