XTEN Architecture

Culver City, California | Since 2000 | Employees 12

XTEN Architecture
10315 Jefferson Boulevard, CA 90232 Culver City, California, United States
Phone +1 310 773 4188
Fax +1 310 287 2002


XTEN Architecture
Austin Kelly, MArch, AIA, LEED AP

He was born in Boston, Massachusetts in 1966. In 1988 he graduated from Williams College in Massachusetts with a Bachelor of Arts degree in Studio Art and Economics and was awarded the Sanderson prize in Architecture. In 1989 he attended SCI-Arc in Vico Morcote, Switzerland for architectural design studios with Peter Zumthor and Ivano Gianola. In 1993 he graduated from Yale University Graduate School of Architecture with a Master of Architecture degree. From 1993 through 1998 he worked in the Los Angeles architectural offices of Frank Israel, Frank Gehry and Eric Owen Moss, playing a substantial role in several award winning projects. In 1999 he worked for DMJM/ Keating on high-rise buildings in Asia, and also began teaching at SCI-Arc in Los Angeles. From 2000 to 2004 he led architectural design studios at the University of Southern California School of Architecture. In 2000 he established XTEN Architecture with partner Monika Häfelfinger. Austin Kelly lives in Los Angeles.

Monika Häfelfinger, MArch

She was born in Basel, Switzerland in 1965. From 1982 to 1986 she apprenticed at the office of her father, an ETH/ Harvard GSD educated architect, Häfelfinger Architekten in Sissach, Switzerland. In 1987 she moved to Los Angeles to enroll in the undergraduate architecture program at University of Southern California, from which she graduated with a Bachelor of Architecture Degree in 1992 receiving the Robert Allen Rogaff Award. In 1994 she graduated from Columbia University with a Master of Science Degree in Advanced Architectural Design. From 1994 through 1995 she worked for the architectural office of Herzog and de Meuron in Basel, Switzerland, playing a key role in several award winning buildings and competitions. In 1996 she returned to the US, working for DMJM/ Keating on high-rise buildings in Asia before establishing her own design studio later that year. In 2000 she established XTEN Architecture with partner Austin Kelly. Monika Häfelfinger lives in Los Angeles.


XTEN Architecture is an award-winning architecture firm located in Los Angeles, California, with associate offices in Sissach, Switzerland. Founded in 2000 by partners Monika Häfelfinger and Austin Kelly AIA, XTEN Architecture is a full service architecture and design firm specializing in cultural buildings, office and commercial facilities and residential estates. Building designs are developed using innovative materials and sustainable technologies, and guided from schematic design through construction.

XTEN approaches architecture with an emphasis on minimalist logic, material transformation and refined detailing and craftsmanship. The architects develop strong sculptural forms and open spaces transformed by direct connections to nature.


2010 American Architecture Award, Sapphire Gallery, Chicago Athenaeum/ European Centre for Art and Architecture
2010 American Institute of Architects California Council Design Award, Sapphire Gallery, American Institute of Architects
2010 International Architecture Award, Sapphire Gallery, Chicago Athenaeum/ European Centre for Art and Architecture
2009 International Architecture Award, Openhouse, Chicago Athenaeum/European Centre for Art and Architecture
2007 IV Bienal Architecture Award, Openhouse, Bienal Miami + Beach
2007 AIA/LA Design Award, Openhouse, American Institute of Architects
2007 Ten to Watch, California Home+Design Magazine
2006 AIA/NextLA Design Award, Diamondhouse, American Institute of Architects
2006 New Architecture LA Exhibit, A+D Architecture and Design Museum
2005 House of the Month, Vhouse, Architectural Record
2004 Emerging Architect, Architectural Record


2011 Topanga Canyon Residences Masterplan, Topanga Canyon, California
2011 Luzern Stadtarchiv Wettbewerb, Luzern, Switzerland
2011 Manhattan Beach Residence, Manhattan Beach, California
2010 Bel Air Estate, Bel Air, California
2010 Muscat Villa, Muscat, Oman
2010 Doheny Residence, Beverly Hills, California
2010 Brentwood Residence, Brentwood, California
2009 Summit Drive Residence, Beverly Hills, California
2009 Za'abeel Park Observation Tower, Dubai, United Arab Emirates
2009 COOP Zentrum, Sissach, Switzerland
2009 Madison Club Residence, Palm Springs, California
2008 Sapphire Gallery, Encino, California
2008 Diamondhouse, Santa Monica Canyon, California
2008 Casa Blanca, Hollywood Hills, California
2008 Macapa Residence, Hollywood Hills, California
2007 Openhouse, Hollywood Hills, California
2007 Himmelrain Park Condominiums, Sissach, Switzerland
2007 Surfhouse, Hermosa Beach, California
2006 FordChing Showroom, Chinatown, Los Angeles, California
2006 Silverspur Office Building, Palos Verdes Peninsula, California
2006 Canyon House, Beverly Hills, California
2005 Schoenberg Park Wettbewerb, Bern, Switzerland
2004 Mhouse/ Art Studio, Venice Beach, California
2004 Haupstrasse 61/63, Sissach, Switzerland
2003 Vista Haven Residence, Sherman Oaks, California
2002 Seepark Bahnhof SBB Wettbewerb, Liestal, Switzerland
2002 Vhouse, Sherman Oaks, California