Press Release
Key Points

Legence Strengthens Sustainability Leadership with Acquisition of Corporate Sustainability Strategies (CSS)

Partnering with CSS opens new revenue channels, clients, and opportunities for Legence, enhancing in-house expertise and accelerating efficiency and sustainability in the built environment.

SAN JOSE, Calif. – April 30, 2024 – Legence, a Blackstone Portfolio Company and North America's leading, integrated provider of energy efficiency and sustainability solutions for the built environment, today announced the acquisition of Corporate Sustainability Strategies (CSS), a commercial real estate sustainability consulting firm driving robust investment returns through the design and implementation of cost-effective environmental, social, governance (ESG), and resilience strategies. The acquisition builds on Legence’s long-standing and collaborative relationship with CSS and expands on Legence’s fast-growing client roster and servicing opportunities.

CSS is a leading consulting solutions firm headed by Brenna Walraven, a renowned expert with over 30 years of experience in national institutional, multi-sector real estate. This acquisition marks Legence's latest expansion, building on previous successful acquisitions including P2S, A.O. Reed & Co., and OCI Associates. With CSS's expertise in supporting the strategy, development, and implementation of sustainability programs, this addition will further amplify Legence's efforts to rapidly transform the built environment and deliver year-over-year client savings. CSS will merge with RE Tech Advisors to further enhance Legence's collective impact.

“As a woman-owned organization with a deep commitment to corporate responsibility and positive change, CSS aligns perfectly with Legence's mission to accelerate sustainability in the built environment and enhance in-house expertise,” said Deb Cloutier, Chief Sustainability Officer of Legence and President of RE Tech. “This acquisition marks a significant milestone in our journey to deliver comprehensive solutions that drive both financial and environmental value for our clients."

“Our new partnership with CSS is further proof that we’re attracting top talent and leadership, positioning Legence as the leading provider of integrated decarbonization services,” said Jeff Sprau, CEO of Legence. “CSS’ nearly three decades of experience supporting clients with billions in assets and delivering sustainable outcomes is a perfect match for our customer base as well as our culture. We’re excited to leverage this expertise.”

“Joining Legence’s family of more than 5,000 team members will expand our opportunities to exceed client satisfaction and deliver impactful, high-performance outcomes across the real estate sector,” said Brenna Walraven, President and CEO of CSS. “I’m looking forward to continuing to elevate sustainability within the built environment, driving business case solutions, and am thrilled to be working with a mission-driven and passionate team.”

About Legence
As an Energy Transition Accelerator™, Legence transforms buildings to pave the way for a sustainable future — faster. Legence is North America’s leading, integrated provider of energy efficiency and sustainability solutions for the built environment. Legence improves the performance of buildings, making the spaces that shape our lives healthier and more sustainable. We specialize in helping clients decrease operating costs, reduce carbon emissions, and enhance occupant well-being and productivity. From advisory services and design to construction and ongoing maintenance, we offer a comprehensive suite of Stackable Solutions™ across the entire building lifecycle. With over a century of experience, we have the expertise to implement high-performing projects with unmatched outcomes, serving industry leaders in mission-critical and essential sectors such as data centers, semiconductors, life sciences, healthcare, education, and more. To learn more about Legence and its services, visit

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