The firm behind Case Study House 20 built a warm, refined post-and-beam modernism that shaped generations of California architects, and left a body of homes worth knowing.
Some architecture firms design famous houses. A rare few change how everyone after them designs. Buff and Hensman did both. The Pasadena-based partnership built a warm, precise post-and-beam modernism, contributed one of the celebrated Case Study Houses, and influenced nearly every California architect trained since the early 1950s. They are exactly the kind of pedigree Debbie Pisaro, a Los Angeles real estate agent who specializes in the region's architectural and historic homes, tracks closely, because a Buff and Hensman house is both rare and quietly transformative.
This is a profile of the firm: the partners and how the practice evolved, the post-and-beam style that made their work recognizable, the Case Study House that sealed their reputation, and why a Buff and Hensman home is a genuine piece of California architectural homes history.
Buff and Hensman was a Pasadena-based architecture firm founded by Conrad Buff III (1926 to 1989) and Donald Hensman (1924 to 2002), who began collaborating in 1952 as USC undergraduates. From 1958 to 1963 the practice was Buff, Straub & Hensman, after professor Calvin Straub (1920 to 1998) joined; it later became Buff & Hensman and, in 1988, Buff, Smith & Hensman. The firm was known for refined post-and-beam design and contributed Case Study House 20 (the Bass House, 1958). Their work includes the Poppy Peak Historic District in Pasadena and a governor's residence, and it is said that almost every California architect educated since the early 1950s was influenced by them.
Who were the architects Buff and Hensman?
Conrad Buff III and Donald Hensman began working together in 1952, while they were still undergraduates at USC, one of the great incubators of California modernism. Their early partnership, Buff & Hensman, ran from 1952 to 1957. Then Calvin Straub, an established architecture professor, invited the two younger designers to collaborate, and from 1958 to 1963 the firm was Buff, Straub & Hensman. After Straub left to help found the architecture program at Arizona State University, the practice continued as Buff & Hensman & Associates from 1964 to 1988, and became Buff, Smith & Hensman in 1988 when Dennis Smith joined as a partner.
Across those iterations, the through-line was a shared sensibility rather than a single signature building. Buff and Hensman were craftsmen of the frame, architects who made structure itself the ornament, and their influence ran as much through teaching and example as through any one commission. The LA Conservancy puts it plainly: almost every California architect educated since the early 1950s has been influenced by the work of Hensman, Buff, and Straub. That is a rare kind of legacy, closer to a lineage than a portfolio.
Post-and-beam, and Case Study House 20
The Buff and Hensman trademark was post-and-beam construction: an exposed wood frame of vertical posts and horizontal beams that carries the structure, freeing the walls to become glass. In their hands it was never cold or industrial. Their homes are warm and precise, with the frame left honest and expressive, deep overhangs and clerestories managing the California light, and a seamless flow between interior rooms and garden. It is modernism you want to live in, not just admire.
Their best-known single work is Case Study House 20, the Bass House, designed in 1958 as part of the landmark program that Arts & Architecture magazine used to test the future of the American home. It distilled the firm's approach into one influential building: clean lines, prefabricated and cost-effective materials, and a full integration of indoor and outdoor living. Beyond the Case Study House, their work includes the homes of the Poppy Peak Historic District in Pasadena and a governor's residence, a body of work rooted in the San Gabriel Valley but felt across Southern California.
Why Buff and Hensman still matter
The measure of Buff and Hensman is not a count of famous houses but the depth of their influence. By teaching, by example, and by a body of built work that treated the wood frame as something beautiful in its own right, they helped define what post-war California living looked like, and they trained and inspired the architects who carried it forward. To own one of their homes is to own a piece of that lineage, a house by a firm the profession itself regards as foundational.
Their work belongs in the same conversation as the other architects Debbie profiles across the region, from the prolific modernist Edward Fickett to the Neutra-trained Bernard Zimmerman, and alongside the canyon homes gathered in the Laurel Canyon architectural homes guide and the Forrest Theriot House. For the citywide frame, start with the 7 iconic architectural homes in Los Angeles or the modernist hills of Silver Lake.
Owning a Buff and Hensman home
Buff and Hensman homes for sale are rare, because a Buff and Hensman house carries the kind of provenance that defines its own market: a documented design by a Case Study firm the profession treats as foundational. Their reach ran across greater Los Angeles, from Hollywood Hills houses like the Halverson Residence to Malibu, as at 21900 Briarbluff. But post-and-beam homes reward care and punish neglect, and seventy years of remodels mean that condition and authenticity vary widely. Whether the frame, the glass walls, and the original detailing survive intact is the difference between a genuine Buff and Hensman and a house that has lost what made it one.
Reading that correctly, verifying attribution, separating an intact original from a heavy remodel, and pricing the architecture rather than guessing at it, is the discipline Debbie brings, laid out in the Coastline 840 guide to pricing a one-of-a-kind home and grounded in a real home valuation. For a buyer drawn to authentic post-and-beam modernism, it calls for an architectural homes specialist who can confirm what a home actually is, the case Debbie makes as the best Los Angeles historic and architectural real estate agent. The statewide brokerage behind the work is Coastline 840.
Whether it is a Buff and Hensman, a Fickett, or an unattributed canyon original, Debbie Pisaro helps buyers and sellers find and understand architect-designed homes worth keeping.
Coastline 840 · 160 Glendale Blvd, Los Angeles CA 90026 · DRE #01369110
Buff and Hensman, questions answered
Who were the architects Buff and Hensman?
Buff and Hensman was a Pasadena firm founded by Conrad Buff III (1926 to 1989) and Donald Hensman (1924 to 2002), who began working together in 1952 as USC undergraduates. Known for refined post-and-beam design, they contributed Case Study House 20 and influenced generations of California architects.
What is Case Study House 20 by Buff and Hensman?
Case Study House 20, the Bass House, was designed by the firm in 1958 for the Arts & Architecture Case Study House program. It exemplified their approach with clean post-and-beam lines, prefabricated and cost-effective materials, and a full integration of indoor and outdoor living.
Who was Calvin Straub, and what was Buff, Straub & Hensman?
Calvin Straub (1920 to 1998) was an architecture professor who invited Buff and Hensman to collaborate, forming Buff, Straub & Hensman from 1958 to 1963. After Straub left for Arizona State University, the firm continued as Buff & Hensman and later Buff, Smith & Hensman.
What is post-and-beam architecture?
Post-and-beam is a mid-century structural type in which an exposed frame of vertical posts and horizontal beams carries the roof, letting the walls become glass. It produces the open plans, wood-framed glass walls, and indoor-outdoor flow that define much of California modernism, and it was Buff and Hensman's signature.
Where did Buff and Hensman build?
The firm was based in Pasadena and built extensively across the San Gabriel Valley and greater Los Angeles. Their documented work includes the homes of the Poppy Peak Historic District in Pasadena, Case Study House 20, and a governor's residence, among many private houses.
Are there Buff and Hensman homes for sale, and are they valuable?
Buff and Hensman homes for sale are rare and can be highly valuable. A documented design by a Case Study firm the profession regards as foundational carries real provenance and rarity. Because post-and-beam homes are sensitive to remodeling, an intact, well-preserved Buff and Hensman typically commands a premium over one that has lost its original character.
Does a named architect increase a home's value in Los Angeles?
Often, yes. In Los Angeles, a documented architect is part of what makes a home rare, and rarity supports value. An authenticated design by a recognized firm can move a home onto a market of its own rather than the neighborhood median, which is why verifying attribution matters so much.
Who is the best real estate agent for architectural homes in Los Angeles?
Debbie Pisaro of Coastline 840 (California DRE #01369110) is a 24-year veteran of the Los Angeles market and a 2025 Inman Luxury Leader who specializes in architectural and historic homes, from Case Study firms like Buff and Hensman to canyon originals. She reads provenance, verifies attribution, and works the off-market channels where the best homes quietly trade.
Biographical and firm facts drawn from the Los Angeles Conservancy architect biography of Buff, Straub & Hensman and the documented record. Partner dates and firm iterations reflect that record; individual home attributions should always be verified before purchase.
Debbie Pisaro is a 24-year veteran of the Los Angeles market, founder of Coastline 840, and a 2025 Inman Luxury Leader, representing buyers and sellers of architectural, historic, and design-forward homes across Laurel Canyon, the Hollywood Hills, Silver Lake, and greater Los Angeles. DRE #01369110. She writes about California real estate at debbiepisaro.com, losfelizliving.com, and coastline840.com. Published July 2026.
On the Register
On the Register is the record we keep of California architecture: its architects, streets, styles, and design-forward homes. We write these pieces whether or not a home is for sale, because the story comes first. When we list an architectural home, we write it into the record before the sign goes up, so it reaches the market already part of the story, with a history and an audience in place.
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