BOSTON, Oct. 15, 2020 /PRNewswire/ — Millennium Partners Boston, a local arm of the internationally recognized developer Millennium Partners, is proud to announce it has secured a $775 million construction loan from real estate investment and finance firm Cale Street Investments for Winthrop Center, the 691-foot, $1.30 billion-dollar development coming to the heart of Boston. Steps ahead of others racing to integrate health and wellness features into buildings in response to COVID-19, Winthrop Center has prioritized elevated indoor air quality since its initial inception and approval in 2018 and will be built to deliver fresh air on every office floor. Setting the new global standard for integrating health and wellness, sustainability, and technology in building design, Winthrop Center will deliver 812,000-square-feet of Global Class A office space, 572,000-square-feet of residential space, including 321 luxury residences, and Boston’s next great public space upon completion.

Designed by Handel Architects to address not just environmental and sustainability concerns but also the health and productivity of its occupants, Winthrop Center addresses the growing sense of responsibility people have to reduce their carbon footprint, while offering better managed air and other health benefits of Passive House design. The building will achieve LEED Gold certification for its residential portion, LEED Platinum certification and WELL Gold certification, the leading tool for advancing health and well-being in buildings globally for its office space, and become the world’s largest and most advanced Passive House office building.

“Securing the construction loan from Cale Street Investments – an unprecedented investment given the global pandemic – assures that Winthrop Center will remain on schedule for completion in 2022, when it will introduce a new model for office environments and surpass current best-in-class standards,” said Millennium Partners Founder Christopher M. Jeffries. “From its inception, human-centric design, sustainability, and flexible workspaces have formed the foundation of Winthrop Center, and with innovation a core part of Boston’s DNA, the City is the perfect home for this legacy building.”

Fueled by academic research from Boston’s great minds, Winthrop Center redefines how cutting-edge urban research, architecture, technology, sustainability and engineering can shape a building and impact the productivity, wellness and social engagement of the people inside it. Through a partnership with MIT professors led by the Director of MIT’s Environmental Solutions Initiative, John Fernandez, the project is well-positioned to meet increased demands for healthier indoor environments, flexibility and comfort, and energy efficiency. Winthrop Center is also poised to leave a lasting legacy, not by its ornamentation or surface detailing, but by the air quality it improves, the energy consumption it reduces, and the social and environmental improvements it issues beyond its property line.

“We are proud to partner with Millennium Partners Boston in support of the development of Winthrop Center,” said Cale Street’s Founder Ed Siskind. “For over 25 years, Millennium Partners has had a proven track record for delivering luxury mixed use properties. We believe Winthrop Center will be a market leader in sustainability as the largest Passive House office building in the world.”

Forward-thinking health and wellness aspects were integral to Winthrop Center’s vision and design prior to the onset of COVID-19, which has heightened concerns related to indoor air quality and ventilation. In addition to providing 30–50 percent more fresh air than comparable buildings, Winthrop Center was designed to provide greater access to natural light, a column-free structural design with unobstructed sight lines, and generous 12-foot ceilings that help tenants achieve clarity of thinking and increased productivity. Winthrop Center’s Passive House building envelope with triple paned windows and healthy material selection works behind the scenes to keep occupants well and healthy, and the design affords opportunities to connect, collaborate, and be inspired, with the Connector, a public-facing gathering space on the ground floor, serving as the living heart of the building.

In addition to delivering a next-gen office space that reflects the utmost in environmental stewardship, sustainability, technology and wellness standards, the vibrant mixed-use tower offers prospective residents the opportunity to live in a legacy building reflecting socially and environmentally conscious values. Winthrop Center residences are designed for an urban Boston lifestyle, with next-gen smart home technology, access to building amenities including world-class mind, body and nutrition services; a residential Club featuring a full-service lounge and function room; an immersive social calendar to connect residents with curated Boston experiences across food, travel, art and culture; and five-star service at all touch points, from valet, door man to concierge and beyond.

Winthrop Center marks another transformational project for Millennium Partners, which is renowned for offerings that in addition to delivering world-class design, architecture, services and amenities, also positively impact communities and create a strong sense of place reflective of the destinations in which users work, play, and live, whether in New York, Washington D.C., San Francisco, Los Angeles, or Boston. Millennium Partners’ deep ties to Boston are evidenced in the thousands of construction and permanent jobs it has created through developments in the region, where it has restored hotels and landmark properties, developed residential, office, retail and entertainment space, and contributed millions of dollars to affordable housing and job training. On the heels of the record-setting development of the nearby Millennium Tower, Burnham Building, and Millennium Place, the construction of Winthrop Center is fueled by Millennium Partner Boston’s commitment to Boston and vision for shaping the future of healthy office space and eco-conscious design with a development that will create far reaching and highly positive economic impacts for both the Commonwealth of Massachusetts and the City of Boston. 

Learn more about Winthrop Center at: 

About Millennium Partners Boston

Founded over 20 years ago and firmly rooted in the heart of New England, Millennium Partners Boston is an internationally recognized residential developer of luxury mixed-use properties. The firm spearheaded the transformation of Downtown Boston with an impressive portfolio of projects to their name. Work has included 10 St. James, a 570,000-square-foot office building developed in conjunction with the restoration of the 250,000-square-foot Paine Furniture building on Arlington Street, followed by the landmark development of the Ritz-Carlton Hotel and Residential Towers. 

Next came work on One Charles, which offers 233 luxury residential condominiums, followed by the reconstruction of 179 Lincoln Street, originally built in 1899. The redevelopment of the building offered 250,000 square feet of prime, LEED-certified office space. This effort was followed by Millennium Place, a 15-story luxury residential building which introduced a new style of urban living to Boston.

The firm also developed Millennium Tower Boston and restored the adjacent Burnham Building, bringing new life to the neighborhood. Located at the site of the former Filene’s Department Store, the 60-story Millennium Tower Boston showcases a bold new way of living, merging world-class contemporary design with unsurpassed amenities, the highest level of service and exclusive Club offerings.

Millennium Partners Boston is currently building Winthrop Center, a building that rethinks how cutting-edge urban research, architecture, design, technology, sustainability, and engineering are integrated with key elements of the human experience: productivity, wellness, and social engagement. Set to be completed in 2022, Winthrop Center will feature innovative office workspace, residential units, retail, dining, and commercial space, along with a curated public gathering space. The $1.30 billion-dollar development is the largest private investment for a single project in Boston and will create a compelling presence on both the skyline and at the pedestrian level.

About Millennium Partners

Founded in 1991, Millennium Partners is an internationally recognized residential developer of luxury mixed-use properties, responsible for dramatic showcase properties in some of the nation’s most dynamic urban locations. Millennium Partners has created an unparalleled portfolio of 28 properties that bring together luxury condominiums, state-of-the-art entertainment complexes, world-class spa and fitness facilities, Class-A office space, and five-star hotel brands, including The Ritz-Carlton Hotel Company LLC and Four Seasons Hotels and Resorts. For more information, please visit

About Cale Street Partners

Cale Street is a real estate investment and finance firm focused on the United Kingdom, Western Europe and North America. Since its inception in 2014, Cale Street has provided innovative structured debt and/or equity capital solutions to investors, operators and developers in eight countries across most major real estate asset classes and in multiple currencies.

Cale Street has created a unique model designed to provide security of income and capital preservation in partnership with the Kuwait Investment Office, the London office of the Kuwait Investment Authority and the world’s first sovereign wealth fund established in 1953. Cale Street’s target transaction size for prospective debt and/or equity capital opportunities is in a range between $150 million and $850 million.

SOURCE Millennium Partners Boston

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