HCM #840. A 1937 Gregory Ain modernist house in the Los Feliz Oaks, built for a paper salesman and now under a Mills Act contract.
What is the Ernst House?
The Ernst House at 5670 Holly Oak Drive is a 1937 modernist residence in the Los Feliz Oaks, designed by the architect Gregory Ain for Ansalem A. Ernst, a Kansas-born paper salesman. It was designated Los Angeles Historic-Cultural Monument #840 on March 17, 2006, and it is protected today under a Mills Act contract. The house is known for its walls of glass, its indoor-outdoor plan, and its place in the career of one of the most socially minded architects Los Angeles ever produced, a designer who wanted modern living to reach far beyond the wealthy.
Gregory Ain believed a beautiful modern house should not be a privilege of the rich. He spent a career trying to prove it, designing clean, light-filled homes for schoolteachers and salesmen at a time when modernism was mostly a plaything of the wealthy. The Ernst House is one of the intimate, human-scaled results, and it helps explain why the FBI once considered its architect a threat.
It also sits in rare company. A few doors down on the same street stands the Edwards House, Ain's first independent commission, which makes this short stretch of Holly Oak Drive a two-house survey of an important architect. It is exactly the kind of pairing a Los Feliz realtor points out to buyers who want a home with a real place in design history.
Gregory Ain, the most dangerous architect in America
The Ernst House was designed by Gregory Ain, who lived from 1908 to 1988 and ranks among the essential figures of Southern California modernism. Ain worked in Richard Neutra's office in the early 1930s, drew early inspiration from Rudolph Schindler, and opened his own practice in 1935, just two years before the Ernst House. What set him apart was less a signature look than a mission: he wanted to bring good modern design to ordinary people.
That conviction had consequences. Ain's politics and his interest in affordable, communal housing drew the attention of the federal government, and FBI director J. Edgar Hoover reportedly branded him the most dangerous architect in America. Undeterred, Ain went on to design the Mar Vista Tract in 1948, often credited as one of the first FHA-approved modernist tract developments, and in 1950 the Museum of Modern Art built one of his houses in its New York garden as its exhibition home. On a single commission like the Ernst House, that whole philosophy shows up in miniature: generous glass, an easy flow between rooms and garden, careful built-in cabinetry, and a warmth that keeps the modernism from ever feeling cold. Ain designed for how people actually live, not for the camera, and houses like this one have aged into that intention gracefully. It is a vivid chapter in the story of Gregory Ain in Los Angeles and in the broader sweep of the Los Angeles house styles buyers fall for.
Two Ains on Holly Oak Drive
The Ernst House does not stand alone. A short walk away at 5642 Holly Oak Drive is the Edwards House, Gregory Ain's first independent commission, built in 1936 and designated Historic-Cultural Monument #260. To have two Ain houses, one from the very start of his solo career and one from just a year later, on the same quiet street in the Los Feliz Oaks is a genuine rarity, the sort of concentration usually reserved for a museum campus rather than a residential block.
The Edwards House earned early acclaim, named a House of the Year by House Beautiful in 1938, and together the two homes let you watch a major architect find his voice in real time. That kind of concentration is part of what makes the Oaks one of the most coveted pockets in Los Feliz, a leafy grid of period and modern homes above the flats. Buyers drawn to this street are usually the same people who study the Edwards House, trace the influence of R.M. Schindler, and look closely at what makes The Oaks feel the way it does.
What do HCM #840 and the Mills Act mean here?
Historic-Cultural Monument status is the oldest form of landmark protection in Los Angeles. For the Ernst House, the 2006 designation recognizes both its intact Gregory Ain modernism and its place in the architect's early career. On this house that protection comes with a concrete financial layer, because the Ernst House is held under a Mills Act contract.
The Mills Act is California's leading incentive for historic preservation, and it can significantly lower a landmark owner's property taxes in exchange for a commitment to maintain the home. A house that already carries an active contract is a meaningful advantage for a buyer, since the tax benefit and the preservation framework are in place. It is one of the first things a serious buyer asks Debbie Pisaro to model, and a central issue when selling a Mills Act or HCM home in Los Feliz. Designation also shapes value in ways our look at how historic designation affects a Los Feliz home's worth takes on directly.
An architect-designed house under an active Mills Act contract is a specific kind of opportunity: the tax savings are already established and the preservation rules are known up front. On an intact Ain, that combination tends to protect value rather than limit it.
This is the kind of house Debbie Pisaro is built to represent. She works these homes as an architectural homes specialist across the east side. Her brokerage, Coastline 840, is an independent boutique built on the belief that small teams outperform the big-box brokerages. She tells the story of why she built it on the Coastline 840 blog.
If you own an architectural home in Los Feliz and are weighing a sale, the first step is a real number grounded in current comps, which you can request through a private Los Feliz home valuation. If you would rather buy one, a Los Feliz realtor who works these blocks keeps a quiet list of off-market Los Feliz homes that never reach the open market. Either way, the best real estate agent in Los Feliz for architectural property is where the search should start. For the full neighborhood, our Los Feliz HCM guide maps every designated home.
Ernst House questions, answered
Where is the Ernst House in Los Feliz?
The Ernst House stands at 5670 Holly Oak Drive in the Los Feliz Oaks, Los Angeles, CA 90068, a short walk from Gregory Ain's Edwards House. It is a private residence rather than a museum, so it is best appreciated from the public street, in keeping with the quiet character of the hillside neighborhood.
Who designed the Ernst House?
The Ernst House was designed by Gregory Ain, a leading figure in Southern California modernism who trained in Richard Neutra's office and drew on the ideas of Rudolph Schindler. Ain built the house in 1937 for Ansalem A. Ernst, applying his belief that clean modern design should be available to ordinary families.
When was the Ernst House built?
The Ernst House was built in 1937, two years after Gregory Ain opened his own practice. It came early in his career, close in time to his first independent commission, the neighboring Edwards House of 1936, which makes this stretch of Holly Oak Drive an unusually concentrated record of his early work.
Why did the FBI watch Gregory Ain?
Ain's leftist politics and his commitment to affordable, communal housing drew federal scrutiny during a suspicious era, and FBI director J. Edgar Hoover reportedly called him the most dangerous architect in America. The label says more about Cold War anxieties than about Ain, who simply believed good design belonged to everyone.
Is the Ernst House under a Mills Act contract?
Yes. The Ernst House is held under a Mills Act contract, California's leading historic-preservation incentive, which lowers property taxes in exchange for a commitment to maintain the landmark. For a prospective buyer, an active contract is an advantage, since the tax benefit and preservation terms are already established on the property.
Why is the Ernst House a Historic-Cultural Monument?
The City of Los Angeles designated it Historic-Cultural Monument #840 on March 17, 2006, recognizing its intact Gregory Ain design and its place in the architect's early career. The designation protects the home's distinctive modernist character and reflects Ain's significance to Los Angeles architecture.
Is the Ernst House related to the Edwards House?
Yes, in authorship and location. Both were designed by Gregory Ain and stand a short distance apart on Holly Oak Drive. The Edwards House at 5642 Holly Oak Drive, HCM #260, was Ain's first independent commission in 1936, and the Ernst House followed in 1937, giving the street two of his early works.
Can the Ernst House qualify for the Mills Act?
The Ernst House already carries a Mills Act contract, so the preservation framework and tax benefit are in place. For other designated homes, eligibility to apply depends on the property and current program terms, so any buyer weighing a landmark should confirm the specifics of the contract or the application before relying on the savings.
Who is a good Los Feliz real estate agent for architectural homes?
Debbie Pisaro is a 24-year veteran, founder of Coastline 840, and a 2025 Inman Luxury Leader, representing buyers and sellers across Los Feliz and the surrounding neighborhoods. She specializes in architectural, historic, and Historic-Cultural Monument homes, including modernist landmarks, and she works The Oaks street by street.
Talk to Debbie
Twenty-four years of Los Angeles luxury real estate, with a specialty in architectural, historic, and design-forward homes.
debbie@coastline840.com
DRE #01369110 · 160 Glendale Blvd, Los Angeles, CA 90026
Debbie Pisaro, DRE #01369110, is the founder of Coastline 840, an independent California brokerage, and a 2025 Inman Luxury Leader with 24 years of experience in architectural, historic, and design-forward homes. 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.
© 2026 Debbie Pisaro, Coastline 840 · ontheregister.com
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.
© 2026 Debbie Pisaro, Coastline 840 · ontheregister.com