Besides HOK isa global design, architecture, engineering and planning firm, is at the same time the largest U.S.-based architecture-engineering firm and the second-largest interior design firm.

HOK Architecture enriches people’s lives with its more than 1,800 people collaborating across this network of 25 offices on three continents.


HOK counts with two larger offices in California, one in San Francisco and the other in Los Angeles.

San Francisco

The San Francisco office has been part of HOK’s United States network since 1966 and has been certified as a San Francisco Green Business

  • Follow the San Francisco office on Instagram
One Bush Street - Suite 200 - San Francisco, California 94104 USA | +1 415 243 0555




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Los Angeles

The Los Angeles office has been part of HOK’s United States network since 1983, and has c onsistently ranked as one of top 10 architectural design firms in Los Angeles by the Los Angeles Business Journal, and, as the third-largest commercial interior design firm in Los Angeles by the Los Angeles Business Journal.

  • See images of HOK’s Los Angeles office on Flickr.
9530 Jefferson Boulevard - Culver City, California 90232 USA | +1 310 838 9555


In 1955, HOK was established in St. Louis, Missouri, and the company was named due to the surnames of its three founding partners: George Hellmuth, Gyo Obata and George Kassabaum. The HOK founding partners were all graduated at the School of Architecture from Washington University in St. Louis.

The design firm started with 26 employees and its three founders.

The firm has started winning commissions across the United States by the mid-1960s, and HOK began to open additional offices, starting with San Francisco.

Tokyo Telecom Center in Tokyo designed by HOK


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In 1968, HOK released its interior design practice and started to expand also to Washington DC. In 1973, HOK established its presence in New York and acquired Kahn & Jacobs, and by the 1970s, the firm was operating internationally too.

Just in the decade of 90s HOK opened its first office outside the US, in Hong Kong. In 1987, it was time for HOK’s London office. And actually by 2007 international work represented more than 40% of HOK’s annual revenue.

Indianapolis International Airport Colonel H. Weir Cook Terminal in Indianapolis designed by HOK

In 2013, HOK acquired the New York and Shanghai offices of hospitality design firm BBG-BBGM, creating one of the largest interior design firms, and in 2015, HOK announced that it had completed its acquisition of 360 Architecture.

HOK’s mission is to deliver exceptional design ideas and solutions for all clients, having the focus that creativity and human needs need to be the main goal of every project.

King Abdullah University of Science and Technology in Thuwal designed by HOK

The thinking on environmental stewardship, value creation, science and art is one of the main issues that designs from HOK have in mind.

HOK design solutions result from a collaborative process between multidisciplinary professional to built different environments.

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