Sustainable design is responsible design.

Sustainable design is responsible design. The efficient use of resources translates to long-term returns for our clients and communities through high-performance buildings, improved open space and healthy interior environments. Sustainability is a core value of LEO A DALY, and the firm has championed sustainable practices and materials across the markets it operates in. That’s why LEO A DALY is a signatory of all industry commitments on sustainability.

A woman and a man stand on the rooftop terrace of 20 Mass mixed-use development in Washington, D.C. overlooking the cityscape from the green roof under a partly cloudy sky.
High Performance Design

High Performance Design
Decarbonization

Decarbonization
Industry Pledges

Industry Pledges
Responsible Materials

Responsible Materials
Wellbeing

Wellbeing
Post-occupancy Evaluation

Post-occupancy Evaluation

Recent news

Featured
LEO A DALY expertise on adaptive reuse featured in The Military Engineer
LEO A DALY expertise on adaptive reuse featured in The Military Engineer

LEO A DALY Federal Account Lead Aaron Wilt and National Director of Engineering Kim Cowman coauthored an article in the March/April 2025 issue of The Military Engineer about the benefits of adaptive reuse of underutilized structures in creating efficiency and cost savings

High-performance design lead Nick Lassek selected as top industry young professional
High-performance design lead Nick Lassek selected as top industry young professional

LEO A DALY’s Nick Lassek, PE, CBCP, has been selected for Building Design + Construction’s prestigious 40 Under 40 list. At 29, Lassek has ascended from an intern to the firm's high-performance design lead, exemplifying innovation and leadership in sustainable architecture.

Taking Flight: LEO A DALY’s hospitality team earns finalist spot in international Radical Innovation Competition
Taking Flight: LEO A DALY’s hospitality team earns finalist spot in international Radical Innovation Competition

The public can vote on LEO A DALY’s innovative adaptive reuse proposal to convert aircraft fuselage into hospitality spaces.

LEO A DALY’s Irena Savakova speaks to Washingtonian Magazine about 20 Mass
LEO A DALY’s Irena Savakova speaks to Washingtonian Magazine about 20 Mass

Washingtonian Magazine recently featured 20 Massachusetts Avenue Northwest, a LEO A DALY-designed adaptive reuse project, as example of successful conversions of office buildings.

LEO A DALY signs MEP 2040 pledge, pushing forward sustainability goals
LEO A DALY signs MEP 2040 pledge, pushing forward sustainability goals

LEO A DALY has signed on to MEP 2040, a movement to radically reduce total carbon emissions associated with building systems through collective action. Signatories seek to achieve operational net zero in their projects by 2030 and net zero embodied carbon by 2040.

Adaptive Reuse Saves Embodied Carbon at Repositioned 20 Mass
Adaptive Reuse Saves Embodied Carbon at Repositioned 20 Mass

Our integrated design team excels in complex adaptive reuse projects. The process of redesigning a building to support a new function utilizes our structural engineers, our systems experts, our architects and more. Our teams’ deep knowledge allows them to tackle even the most complex projects. These adaptive reuse projects create far less embodied carbon compared to demolishing and constructing a new building.