One Madison Avenue is about to test something the office market has not seen in a while: a fully leased, post-construction tower extracting nearly a third of a billion dollars in equity through the CMBS market. SL Green is finalizing a $1.7 billion loan to retire the $1.2 billion balance on its construction facility at the 1.4 million-square-foot Midtown South tower, according to a Fitch Ratings report cited by Bisnow. Wells Fargo, Goldman Sachs, JPMorgan Chase, Bank of America, and Deutsche Bank are co-underwriting the deal, which is expected to close during the first week of April.
The structure is notable for what it reveals about lender appetite. At $1.7 billion, the new debt exceeds the outstanding construction balance by roughly $500 million. The ownership group — SL Green alongside the National Pension Service of Korea, Mastern Investment Management, and Hines — will fund $136 million in reserves earmarked for tenant improvements and recent concessions, per the Fitch report. After reserves and retirement of the existing loan, the sponsors pocket $308 million in equity proceeds. Newmark's Jordan Roeschlaub and Nick Scribani arranged the financing.
The equity cash-out is only possible because the asset is, at this precise moment, essentially flawless on paper. Harvey AI's lease expansion of more than 90,000 square feet — disclosed earlier this month — pushed One Madison to 100 percent occupancy, per SL Green. The AI-native legal tech firm now occupies 185,000 square feet in the tower. Its co-tenants include IBM, Coinbase, Franklin Templeton, and Sigma Computing, a roster that reads less like a traditional office rent roll and more like a growth-equity portfolio.
That tenant mix matters enormously to CMBS bond buyers. Diversification across finance, technology, and fintech reduces single-sector concentration risk, while the presence of publicly traded or well-capitalized names supports rent-collection confidence in the underlying collateral. For a market where CMBS issuance of office paper has been episodic at best, five bulge-bracket names on one office deal is a data point worth noting.
SL Green's basis in the asset is substantial but no longer uncomfortable. The company acquired the original One Madison site in 2005 for $918 million and subsequently undertook a $2.3 billion redevelopment that wrapped in 2023, per the firm's public disclosures. All-in, the project represents one of the largest single-asset office investments in New York City's post-financial-crisis era. At a $1.7 billion loan against a basis well north of $3 billion, the implied leverage remains conservative — a prerequisite for investment-grade CMBS execution.
The timing of the refinancing also reflects a deliberate portfolio strategy. SL Green has publicly committed to selling roughly $2.5 billion of assets while deploying approximately $1 billion into acquisitions and development. The $308 million cash-out from One Madison functions as internal capital recycling without triggering a taxable disposition. It is a liquidity mechanism, not a retreat.
On the acquisition side, SL Green has moved quickly. The firm went into contract to acquire Park Avenue Tower at 65 East 55th Street for $730 million from Blackstone — a price sources describe as a discount to Blackstone's invested basis in the asset. Separately, SL Green agreed to purchase the former Brooks Brothers flagship at 346 Madison Avenue, a site capable of supporting an estimated 800,000-square-foot office development adjacent to Grand Central Terminal. Harrison Sitomer, recently elevated to president, is overseeing execution across this simultaneous buy-sell-develop cycle.
The broader implication of the One Madison refinancing is less about SL Green's balance sheet and more about what it signals for the CMBS office market. Office has been the problem child of structured credit since 2020, with delinquency rates on office CMBS loans climbing to multi-cycle highs, according to Trepp data. A $1.7 billion, five-bank underwritten deal on a fully leased New York asset doesn't cure the sector's ills — vacancy across Midtown and Midtown South still runs in the low-to-mid teens, per CBRE — but it establishes a credible execution benchmark for lenders and borrowers alike.
It also underscores the bifurcation that has defined New York office credit for the past three years. Trophy assets with strong sponsorship, diversified tenancy, and genuine amenity packages — One Madison's offerings include a Chelsea Piers fitness club, a tenant lounge, and multiple dining concepts operated by Daniel Boulud — are clearing the debt markets at leverage levels and pricing that would surprise observers anchored to headline vacancy statistics. Everything else is still negotiating extensions.
When SL Green paid $918 million for One Madison's predecessor in 2005, the deal raised eyebrows for its price. Two decades, a $2.3 billion gut renovation, and a $1.7 billion CMBS loan later, the building that Harvey AI just pushed to full occupancy is set to return $308 million in cash to its owners before a single tenant has renewed. The question for the bond market is whether the five banks on this deal have found the floor — or simply the one building worth standing on.