Empire State Building retrofit

Empire State Building retrofit
Name	Empire State Building retrofit
Location	Manhattan, New York City, New York, United States
Start date	2009
Completion date	2013
Owners	Empire State Realty Trust
Cost	$20 million–$120 million (reported phases)

Empire State Building retrofit

The Empire State Building retrofit was a comprehensive modernization program that upgraded the Empire State Building in Manhattan, New York City with advanced energy efficiency and conservation measures, extensive building envelope improvements, and mechanical system overhauls to reduce energy use, operating costs, and carbon emissions. Led by owners and partners including the Empire State Realty Trust, the project drew on expertise from firms associated with Rockefeller Center, International Finance Corporation, and private investors, and intersected with programs run by the U.S. Department of Energy, New York State Energy Research and Development Authority, and local sustainability initiatives. The retrofit became a widely cited model in discussions involving LEED certification, retrofit financing, green leasing, and historic preservation of skyscrapers such as the Chrysler Building and Woolworth Building.

Background and Motivation

Rising utility costs, tenant expectations shaped by developments at One World Trade Center and Bank of America Tower (One Bryant Park), and regulatory pressures from New York City sustainability agendas motivated owners to pursue a major retrofit. The project responded to comparative analyses with landmarks like Seagram Building and 30 Rockefeller Plaza, and to market trends influenced by investors such as Blackstone Group and Tishman Speyer, and certification frameworks promoted by U.S. Green Building Council. The retrofit aimed to address inefficiencies common to prewar skyscrapers exemplified by the Empire State Building and similar assets owned by firms like Vornado Realty Trust and Hines Interests.

Retrofit Planning and Goals

Planning involved multimodal stakeholders: the building owner, capital partners, architects from firms comparable to Skidmore, Owings & Merrill and Foster + Partners, engineering partners resembling Arup and Thornton Tomasetti, and consultants linked to McKinsey & Company and Deloitte. Goals included reducing energy consumption, improving tenant comfort to attract companies such as LinkedIn and Cushman & Wakefield tenants, preserving historic fabric recognized by New York City Landmarks Preservation Commission, and demonstrating replicable finance models akin to those used by International Finance Corporation and European Investment Bank. Financing blended private equity, incentives from entities like NYSERDA and municipal programs referenced by Mayor Michael Bloomberg’s PlaNYC, and performance contracting strategies used by firms such as Johnson Controls.

Energy Efficiency Upgrades

Upgrades targeted lighting, controls, windows, and HVAC controls with technologies comparable to products from Siemens, Schneider Electric, and Honeywell International Inc.. Measures included high-efficiency LED retrofits, daylighting controls inspired by projects at Bank of America Tower, occupancy sensors, metering systems aligned with standards from the U.S. Department of Energy and reporting comparable to Energy Star protocols. Window refurbishments used insulated glazing techniques similar to installations at MetLife Building, and envelope air-sealing referenced work on historic façades like the Woolworth Building. The program emphasized measurement and verification consistent with methodologies from International Performance Measurement and Verification Protocol stakeholders and targeted substantial reductions in greenhouse gas metrics tracked in line with CDP (formerly Carbon Disclosure Project) reporting norms.

Structural and Envelope Improvements

Interventions respected the building’s Art Deco character, coordinating with preservation frameworks like those used for Grand Central Terminal and the Statue of Liberty National Monument. Teams executed thermal insulation upgrades, masonry repointing, and selective replacement of window sashes while preserving historic mullions, paralleling treatments at Flatiron Building and Guaranty Building. Structural assessments referenced methods practiced by firms involved with John Hancock Center renovations, ensuring interventions did not compromise landmark status or elevator cores similar to those in Chrysler Building restorations.

Mechanical, Electrical, and Plumbing Modernization

Mechanical modernization included upgrading chillers, boilers, pumps, and controls with digital building management systems resembling deployments by Siemens Building Technologies and Schneider Electric. Electrical upgrades introduced advanced submeters and power distribution improvements following practices used at One Bryant Park, and plumbing overhauls reduced potable water demand using fixtures comparable to those promoted by Environmental Protection Agency programs. Integration with tenant-fit systems and coordination with vertical transportation companies akin to Otis Elevator Company and KONE were essential to minimize disruption.

Occupant Experience and Operational Changes

Operational changes introduced green leasing models, tenant engagement programs, and energy dashboards similar to systems used by Bloomberg LP and Google in their office campuses. Amenities and wayfinding were updated to align with contemporary workplace standards exemplified by firms like WeWork and Salesforce Tower operators, while building services and property management adopted practices common to CBRE and JLL. The retrofit emphasized indoor environmental quality monitoring influenced by public health guidance from Centers for Disease Control and Prevention and workplace wellness frameworks used by WELL Building Standard proponents.

Outcomes, Performance, and Legacy

Post-retrofit performance achieved substantial reductions in energy use intensity and greenhouse gas emissions reported to levels comparable to high-performing assets like One Bryant Park and Bank of America Tower, and earned recognition within the LEED program and energy-efficiency awards akin to those from the American Council for an Energy-Efficient Economy. The project influenced subsequent retrofits of historic skyscrapers including initiatives at the Chrysler Building and informed municipal policies in New York City and programs by NYSERDA and the U.S. Department of Energy. The retrofit became a case study in capital markets, cited by investors such as Goldman Sachs and Morgan Stanley for demonstrating value capture through sustainability upgrades, and continues to be referenced in literature on urban decarbonization, historic preservation, and resilient infrastructure.

Category:Empire State Building Category:Building retrofits Category:Energy efficiency