Efficiency Pays.

Always Has. Always Will.



$320B in AuM

clients cumulatively represent





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.

CSS: EarthDay.org | 52 Ways to Restore Our Earth
PV Valuation: How Solar PV Adds Value to Your Assets
Realcomm: Improving ESG Performance - Achieving Carbon Neutrality in the Built Environment

News & Events

Earth Day 2023 | 52 Ways to Restore Our Earth

Earth Day 2023 | 52 Ways to Restore Our Earth

Over 1 billion individuals in 193+ countries mobilize for action every Earth Day.  World climate leaders, grassroots activists, nonprofit innovators, thought leaders, industry leaders, artists, musicians, influencers, and leaders of tomorrow are all involved.  ...

ESG Webinar: 2022 Progress Report and a Look Ahead for 2023

ESG Webinar: 2022 Progress Report and a Look Ahead for 2023

2022 Progress Report and a Look Ahead for 2023 Part of Duane Morris LLP’s Environmental, Social and Governance (ESG) Webinar Series   About the Program   Among nonfinancial criteria, businesses must increasingly consider ESG (Environmental, Social and...

Analyzing GRESB Results: A Case Study on a First-Time Submittal

Analyzing GRESB Results: A Case Study on a First-Time Submittal

As the demand for ESG initiatives and reporting from stakeholders continues to rise, mechanisms for quantifying progress are becoming increasingly popular. The GRESB (formerly known as the Global Real Estate Sustainability Benchmarking) assessment supports fund...

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

Ready to strategically leverage the value of sustainability?

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