Office Space at One Madison
At its core, the building offers generous, column‑free floor plates—up to 60 feet, 6 inches in span—to maximize flexibility, daylight penetration, and design freedom.
To deliver on health and sustainability, the building incorporates a DOAS air system designed to supply 100% outside air to tenants, elevating indoor air quality across the workspace.
The redevelopment of One Madison is more than a facelift. It’s a transformation of how workplaces should exist in the city. The design blends the old with the new: restoring and activating a historic architectural shell while offering exceptional sustainability features and workplace enhancements.
The building’s amenities and wellness focus are central to the repositioning: One Madison is pursuing WELL Building Certification, reinforcing its commitment to human-centric environments.
Its neighborhood adds to the appeal. Tenants occupy a location rich with culture, dining, transit connectivity, greenspace, and an engaged community.
The objective is to deliver an office experience where form, function, and health coexist—and give tenants reason to think differently about their next move.
Building Class: Trophy
2023
Year Renovated
5★
The Office Advisor Rating
Building Information
- Building Name: One Madison
- Submarket: Flatiron & Union Square
- Market: Midtown South
- Zip Code: 10010
- Building Size: 1,396,594 sq. ft.
- Year Built: 1909
- Year Renovated: 2023
- Average Floorplate Size: 51,726
- Stories: 27
- Architect: KPF Architects
- Owner: SL Green Realty Corp.
Features & Amenities
Comprehensive Redevelopment
The transformation of the building began in November 2020 after its former tenant vacated in 2021. The redevelopment, estimated at $1.25 billion, integrates the historic structure with a new 19‑story glass addition to expand and modernize the office experience.
Illuminated Lobby & Social Staircase
The renovation includes a reimagined north lobby with soaring ceilings, a landscaped plaza, and a striking “social” staircase that acts as both circulation and gathering space—connecting lobby and amenity levels.
Atrium & Floor‑to‑Ceiling Glass
Podium levels feature nine‑foot-square, floor-to-ceiling windows to maximize daylighting, while the glass-clad upper tower enhances natural light and views.
Amenity Integration & Mixed Uses
The redevelopment will add ground-floor retail, a revitalized podium, and a multipurpose auditorium. The project seeks to blend classic architecture with new systems, providing flexibility for tenant amenities.
Sustainability & Certification Goals
As part of its repositioning, One Madison emphasizes environmental performance and is pursuing WELL certification as well as broader sustainability strategies.
