NEW YORK, March 10, 2026 — SL Green Realty Corp. has secured a landmark office lease with artificial intelligence firm Harvey AI for the remaining space at One Madison Avenue, completing the building’s lease-up and positioning the company for its strongest first quarter in 28 years. The deal, announced today, includes a 92,663-square-foot expansion for Harvey AI and brings SL Green’s office leasing activity in the first 65 days of 2026 to 832,135 square feet across 44 leases. Company executives now project exceeding 900,000 square feet of office leasing by quarter’s end, shattering previous records and challenging narratives about artificial intelligence reducing New York City’s office workforce.
One Madison Avenue: A Transformational Adaptive Reuse Success
The Harvey AI lease represents the final piece in One Madison Avenue’s remarkable transformation story. Located adjacent to Madison Square Park, the project converted an existing nine-story podium into flexible Class-A office space while adding a new 550,000-square-foot tower above. Construction and lease-up completed precisely on schedule and budget, with achieved rents exceeding initial underwriting projections. This achievement follows the similar success of One Vanderbilt, which also reached 100% occupancy, demonstrating SL Green’s consistent execution in Manhattan’s most competitive submarkets.
Architecture firm Kohn Pedersen Fox (KPF) led the design transformation, while hospitality partner Daniel Boulud contributed to the building’s amenity programming. The project represents New York City’s most ambitious adaptive reuse endeavor to date, preserving historic elements while creating modern, efficient office environments that appeal to technology and professional services tenants. Industry analysts note that completed leasing at premium rents during a period of market uncertainty signals both the property’s quality and SL Green’s leasing capabilities.
Record-Breaking Q1 2026 Leasing Momentum
Beyond the Harvey AI transaction, SL Green’s leasing velocity in early 2026 has been extraordinary. The company reported major recent signings at 11 Madison Avenue and 245 Park Avenue, contributing to the 832,135 square feet leased year-to-date. Significantly, more than 344,000 square feet of this total represents expansions by existing tenants rather than new market deals, indicating strong tenant retention and satisfaction.
- Pipeline Strength: SL Green maintains an active pipeline exceeding 800,000 square feet of additional potential leases
- Portfolio Occupancy: The company projects over two-thirds of its office portfolio will achieve weighted average leased occupancy of 98% or higher by year-end 2026
- Market Differentiation: While Manhattan’s overall office vacancy rate remains elevated near 18%, SL Green’s trophy and transit-oriented properties continue attracting premium tenants
Management Commentary: AI as Net Beneficiary for NYC
Marc Holliday, Chairman and CEO of SL Green, provided explicit commentary challenging prevailing narratives. “Our incredible first quarter—likely the best in our entire history—has been driven by large, long-term commitments from sophisticated companies,” Holliday stated. “This momentum represents the ultimate response to the false narrative that AI is shrinking the workforce in New York City.” He further emphasized that “New York City will be a net beneficiary of growth in Tech and AI, continuing to attract leading companies that employ top-level talent that is not easily replaced with computers.”
Holliday’s comments reference ongoing debates about artificial intelligence’s impact on white-collar employment patterns. His perspective aligns with recent studies from the New York City Economic Development Corporation showing AI-related job growth outpacing displacement in the metropolitan area. The Harvey AI lease, involving significant expansion space, provides tangible evidence supporting this position.
Broader Manhattan Office Market Context
SL Green’s performance contrasts with broader Manhattan office statistics. According to CBRE’s Q4 2025 Market Report, overall Manhattan availability reached 17.9%, though asking rents remained stable at $74.51 per square foot. The divergence between trophy properties and older Class-B buildings continues widening, creating what analysts term a “bifurcated market.” Properties with modern amenities, sustainability certifications, and prime locations command premium rents and maintain strong occupancy.
| Property Type | Average Availability Rate | Average Asking Rent (PSF) |
|---|---|---|
| Trophy (2015+) | 12.4% | $102.87 |
| Class A | 18.1% | $74.51 |
| Class B | 24.7% | $52.33 |
One Madison Avenue falls squarely in the trophy category, benefiting from its 2024 completion date, LEED Platinum targeting, and direct connections to subway lines. The building’s leasing success at rents exceeding initial projections demonstrates the continued premium tenants place on quality, location, and amenities despite remote work trends.
Forward-Looking Implications and Market Signals
SL Green’s projected Q1 performance provides several forward-looking indicators for commercial real estate observers. First, the company’s emphasis on large, long-term commitments suggests corporations are making strategic decisions about office footprints rather than temporary arrangements. Second, the prevalence of expansion deals indicates healthy tenant growth rather than mere musical chairs within the market. Third, the specific attraction of AI companies to premium Manhattan space contradicts predictions that technology firms would disproportionately reduce physical presence.
Investor Response and REIT Sector Performance
Despite the strong operational news, SL Green’s stock performance presents a contrasting picture. Over the past three months, shares of this Zacks Rank #3 (Hold) company decreased 12.6% compared with the industry’s rise of 5.2%. This disconnect between operational excellence and stock performance reflects broader REIT sector challenges, including elevated interest rates impacting property valuations and investor concerns about office sector headwinds.
Analysts at Zacks Investment Research identify better-ranked stocks in the broader REIT sector, including Cousins Properties (CUZ) and Terreno Realty (TRNO), each carrying a Zacks Rank #2 (Buy). The Zacks Consensus Estimate for CUZ’s 2026 FFO per share moved upward to $2.93 over the past month, while TRNO’s 2026 FFO per share estimate revised upward to $2.79. These upward revisions contrast with more mixed sentiment toward office-focused REITs.
Conclusion
SL Green’s complete lease-up of One Madison Avenue with Harvey AI and projected record Q1 2026 leasing volume delivers multiple significant takeaways. The achievement demonstrates continued demand for premium Manhattan office space despite market challenges, particularly from technology and AI companies expanding rather than contracting their physical presence. Furthermore, the success of adaptive reuse projects like One Madison Avenue provides a model for transforming older properties into competitive modern assets. While investor sentiment toward office REITs remains cautious due to macroeconomic factors, SL Green’s operational execution suggests underlying tenant demand remains robust for well-located, high-quality properties. Market observers will monitor whether this leasing momentum continues through 2026 and whether it signals broader office market stabilization.
Frequently Asked Questions
Q1: What is the significance of SL Green leasing One Madison Avenue to Harvey AI?
The lease completes the building’s occupancy and represents a major expansion for an AI company in Manhattan, challenging narratives that artificial intelligence reduces office demand. The 92,663-square-foot expansion brings the property to 100% leased status.
Q2: How does SL Green’s Q1 2026 leasing compare historically?
The company projects exceeding 900,000 square feet of office leasing for Q1 2026, which would be the highest first-quarter volume in its 28-year history, surpassing previous records by a significant margin.
Q3: What does this mean for New York City’s office market overall?
While the overall Manhattan office market faces challenges with elevated vacancy rates, SL Green’s performance demonstrates continued strong demand for premium, well-located properties with modern amenities and transit access.
Q4: How does adaptive reuse like One Madison Avenue benefit property owners?
Adaptive reuse projects can transform older properties into competitive modern assets, often with favorable economics compared to ground-up construction, while preserving historic elements and achieving premium rents.
Q5: Why is SL Green’s stock performance lagging despite strong leasing news?
Office REIT stocks face pressure from elevated interest rates impacting property valuations and broader investor concerns about office sector headwinds, creating a disconnect between operational performance and stock prices.
Q6: What should commercial real estate investors watch next regarding SL Green?
Key indicators include whether leasing momentum continues through 2026, how interest rate movements affect property valuations, and whether portfolio occupancy reaches the projected 98%+ for two-thirds of properties by year-end.
