In a low-key Midtown power play, SL Green quietly sold a 49% stake in its planned 346 Madison Avenue office tower to Tokyo-based Mori Building on Wednesday. The deal hands a major international partner a big piece of a future trophy asset just one block from Grand Central Terminal, while SL Green stays in the driver’s seat as majority owner and as development and leasing manager.
According to a press release via GlobeNewswire, the joint venture values the 49% interest at roughly $175 million and leaves SL Green with a 51% controlling stake. The release notes that Kohn Pedersen Fox will design a roughly 46-story tower with about 850,000 rentable square feet, featuring terraces, a two-floor amenity suite that includes a 215-seat auditorium, and an épicerie operated by chef Daniel Boulud.
As first reported by Crain's New York Business, the sale comes on the heels of SL Green’s purchase of the Brooks Brothers site last year and continues the REIT’s now-familiar strategy of bringing equity partners into its biggest ground-up projects. Industry sources say the structure lets SL Green trim development risk while still keeping operational control of the building.
Why the partnership matters
Mori already has a foothold in SL Green territory, having previously announced investments at One Vanderbilt, and the latest tie-up pulls more international capital and large-scale development expertise into East Midtown. SL Green has leaned on the 49% joint-venture template before; in January, the company sold a 49% interest in 100 Park Avenue to Rockpoint, a move widely reported as a way to de-risk new construction and preserve liquidity for future deals.
Site, price and timeline
SL Green bought the former Brooks Brothers property at 346 Madison, along with the neighboring parcel at 11 East 44th Street, for $160 million last year, according to company filings. SL Green's filings state that design work is already underway and that more details are slated for release at the company’s investor conference later this year.
On its investor call, SL Green executives said, "We think we can get this done by 2030," laying out an aggressive construction timetable and a target tenant mix of boutique financial firms willing to pay premium Midtown rents. The same call transcript also notes that the company expects to combine construction financing with joint-venture equity to fund the tower as design and leasing progress. SL Green's transcript includes those remarks.
What it means for Midtown
The deal highlights the split personality of Manhattan’s office market: top-tier, well-located buildings are still attracting money and tenants, while aging inventory edges closer to obsolescence. Coverage of SL Green’s recent earnings and transactions has underscored that a scarcity of true trophy product is helping fuel partnerships like this one. Commercial Observer and other trade outlets have been tracking the same trend.
SL Green and Mori have not offered further comment beyond the joint-venture announcement. Both companies say they plan to release more detail on leasing, design, and construction as the project moves through development.
