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 find the maximum potential in every project. We embrace challenges, fueled by a passion for creating environments that promote well-being, interaction, and connection.


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

Paxton brings 18 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 Knox 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 18 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 potential available with every project. Prior to BOS|UA, Silvia was a senior project designer at Utile, Merge Architects and Sasaki.


Current Collaborators

Mandy Lee


Past Collaborators

Ali Sherif

Nina Shabalina

Nicole Ashurian

Will Langevin

Jon Levine

Sam Shpall


Client List


PRX, Inc

Burak and Banu Gokmen

Jerry Chen (Purple Shell)

Emerald Necklace Conservancy

Cameron Grob (Mighty Love Food)

Estefania Ladner & Jose Garcia (Sushi Kappo)


Vyda Bielkus (Health Yoga Life)

Tyson Kratz & Steven Fitzgerald (SolBe Learning Prototype)

Newmarket Business Association (Newmarket Center)

Brian Healy Architects

Josh Goldstein (Law Office of Joshua L. Goldstein, PC)

Private (IV Residence)

Katie Noyes & Alan Bassett (BN Residence)

Galia Shokry

Amanda & Tod Yagi