BOS|UA is an award-winning, full-service Architecture and Urban design firm. Our mission is to create value with our clients using design intelligence as a tool to learn about how we live, learn, communicate and move in the city. We embrace new challenges, fueled by a passion for creating environments that promote well-being, interaction, and connection.

We seek new knowledge through making, researching and collaborating with a large network of peers in related industries; this framework for practice allows our office to stay creative and energized through the entire design process, allowing us to deliver high-quality Architecture.

BOS|UA has a tight team capable of working quickly and thoroughly through the entire spectrum of architectural services and scales. We also partner up strategically with a large network of collaborators to efficiently tackle new challenges and exciting opportunities.




Paxton Sheldahl, AIA, LEED AP
Principal – CV (pdf)

Paxton brings 17 years of experience to BOS|UA. His expertise combines a determined pursuit for design excellence and the know-how to realize it, thanks to a wealth of knowledge on digital and analog technologies, building systems and regulatory frameworks. Prior to BOS|UA Paxton was a senior project architect at OMA NY. Today, both firms maintain a strong bond through ongoing collaborations efforts such as the Faena Arts District in Miami, FL., recently completed, and the Albright Know Museum Addition in Buffalo, NY., currently in development.


Silvia Illia-Sheldahl, LEED AP
Principal – CV (pdf)

Silvia Illia-Sheldahl brings strategic design thinking to BOS|UA. With 17 years of experience in Architecture, her expertise resides in finding innovative design ideas and solutions that respond to wide range of parameters and constraints. Her work reflects on and uncovers the maximum potential available with every project. Prior to BOS|UA Silvia was a senior project designer at Utile, Merge Architects and Sasaki.



Ali Sherif

Nina Shabalina

Nicole Ashurian

Will Langevin