Efficiency Pays.

Always Has. Always Will.



$100B in AUM

clients cumulatively represent




$1B-$25B AUM

client portfolio size range





client savings to date


Our Business Case Approach

Sustainable and efficient operations are a competitive advantage. Corporate Sustainability Strategies works with clients to strategically leverage the value of sustainability. By designing and implementing cost effective sustainability strategies, we help you drive enhanced financial returns.


lower costs

high performance operations

increase profits

gain competitive advantage

Our Focus

National multi-sector real estate leaders use CSS to deliver expert sustainability strategy development and execution plans that enable improved financial and environmental performance.

News & Events

Green Seal in Amazon’s Climate Pledge Friendly Program

Green Seal in Amazon’s Climate Pledge Friendly Program

Amazon initiative makes it easier for customers to shop for certified sustainable products   Green Seal continues to build upon its relationships by participating in Amazon’s Climate Pledge Friendly, a new program that makes it easier for customers to discover and...

Green Seal’s Safer COVID-19 Disinfection Guidelines

Green Seal’s Safer COVID-19 Disinfection Guidelines

As part of Corporate Sustainability Strategies’ commitment to a sustainable future, President & CEO, Brenna Walraven serves as a member of Green Seal’s Board of Directors.   Recently, Green Seal launched its Safer COVID-19 Disinfection Guidelines to provide...

[rev_slider homepage_gallery_slider]

“When a question comes up about sustainability, Brenna is always my very first call.

She was excited about sustainability long before it became a business buzzword and, in many ways, it was Brenna’s passion that introduced energy efficiency and sustainability concepts – many of which we take for granted today – to the commercial real estate industry. Brenna was instrumental in creating BOMA International’s Energy Efficiency Program (BEEP) (more than 15 years ago). That program revolutionized how commercial real estate owners and managers operate their buildings, and it helped to move “green” programs into the mainstream of building operations best practices. Brenna also championed the adoption of Energy Star throughout the commercial real estate industry, and she remains an ardent supporter of Energy Star programs.

One of the things that differentiate Brenna from other consultants is her considerable commercial real estate management experience and her executive leadership expertise. This unique background allows her to develop compelling business cases for sustainability and energy efficiency programs – and ultimately find the “green” solution that is right for each of her clients.

Brenna knows “everyone,” and she is an expert at getting the right people around a table to solve the problem at hand – whether the solution is for a client, a colleague, BOMA International, or the commercial real estate industry as a whole. She is a strategic thinker, a consensus builder, and an active mentor to so many building owners and managers. Without exception, I highly recommend Brenna as a sustainability expert and a thought leader in the commercial real estate field.”

Marc Fischer | Founder

InspiRE Commercial Real Estate Services

“A very engaging presentation from Brenna Walraven that highlighted the importance of a strategic approach to the business case for sustainability and high performance operations. Very informative and insightful!”

Catherine Lai | CEO

Albest International Limited

“For those of us lucky enough to have heard you present before, I believe it was a real treat for BOMA Southern Region Conference attendees to hear and see you. You’re such a natural speaker and always deliver pertinent and timely information. We’ve heard really positive feedback about your presentation.”

Bunnie Willis, RPA | Regional Property Manager

Patrinely Group

Our Commitment to Industry

CSS proudly supports the following industry organizations.

Better Buildings Logo
ULI logo
Real Estate Roundtable Logo
Better Buildings Logo
International WELL Building Institute logo

Ready to strategically leverage the value of sustainability?

Share This