Founded by award-winning architect-developers Arthur Klipfel and Gwen Noyes, Oaktree has developed and/or designed more than 2,000 residential units and commercial spaces across dozens of projects. With a long-standing commitment to sustainability, Oaktree integrates design excellence, innovative materials, and community-minded development to enhance both livability and long-term value.

A key evolution of Oaktree’s mission is GreenStaxx (GSX)—a patented modular design and building system developed by Arthur Klipfel. GSX applies the principles of mass production and standardization to multifamily development. Its core innovation is a digital library of pre-designed, pre-engineered residential unit stacks that fit together like Lego blocks—offering developers speed, cost-efficiency, and design flexibility across sites.

The GSX system is deeply integrated with modular manufacturing partners, reducing construction waste, using sustainable materials, and aligning with LEED standards. With patents in the U.S. and India (and pending in the EU), GreenStaxx represents a scalable solution for faster, greener, and more predictable multifamily development.

To learn more, visit www.greenstaxx.com.