About fifty, or fewer than twenty.

Menlo Park has roughly fifty Eichlers, in five small clusters, built as repeated plans a builder could sell over and over. Atherton has fewer than twenty, all of them custom-scale, in a development Eichler abandoned before he finished it and a small later cluster on two streets.

That difference in kind is why the two towns read so differently to anyone trying to buy, sell or keep one.

The seven Peninsula Way houses carry a Menlo Park mailing address, but they sit in Menlo Oaks, which is unincorporated San Mateo County. The city’s zoning, its historic-site ordinance and its heritage-tree rules do not reach them; county rules do, and Eichler Network reports that the unincorporated pockets have weaker tree protection than Menlo Park, Palo Alto or Atherton.

So the Menlo Park group that most resembles Atherton — big houses, big lots, mature oaks — is also the one with the least protecting it. Anyone comparing the two towns on a map should check which side of the city line a house is actually on.

This is the number that explains most of the rest. Atherton’s minimum lot on level ground is one acre — 43,560 square feet, with sixty-foot front and rear yards. Menlo Park’s Eichler tracts sit in ordinary single-family districts: R-1-S, where the minimum is 10,000 square feet, covers Stanford Gardens, and R-1-U, where it is 7,000, covers Oakdell Park.

On the ground the Stanford Gardens lots on Evergreen Street are recorded at almost exactly 10,010 square feet each — the uniformity is the subdivision’s signature. Joe Eichler’s own house in Atherton sits on 39,123.

The other structural difference: Atherton has no commercial zoning at all — no shops, no restaurants, no grocery. Menlo Park has Sand Hill Road and Meta’s headquarters.

The feature most people picture in an Eichler is largely absent from Menlo Park, and the reason is chronology. Eichler Homes did not put the word “atrium” on a plan until 1957, or market it until 1957–58. Stanford Gardens (1950–51), Oakdell Park (1952) and Peninsula Way (1954–55) all predate that, and no source describes an atrium in any of them.

Atherton is the other end of that story. Anshen & Allen’s Plan 37, of August 1951 — an unroofed court closed on all four sides — was drawn for the upscale Lindenwood houses, six years before the word was used, and it was built here, at 73 Hawthorne Drive. The brochure page that prices it at $47,500 is on this site.

If you own a Menlo Park Eichler and someone has told you it has an atrium, it is worth checking what they actually mean — a courtyard added later is a different thing from a plan built around one.

On paper Menlo Park protects its midcentury houses far better than Atherton does. Under chapter 16.54 of its code, a landmark designation can be started by the owner, by the City Council, or by a civic group, a public agency or an interested citizen — no owner consent required — and the Planning Commission can suspend a demolition for 180 days, which the Council can extend by another 180.

In Atherton, § 8.15.210(A) reserves that entirely to the owner. Nobody else may put a house forward, and an undesignated house has no demolition review at all.

And yet the outcome is the same. Menlo Park’s designated historic resources are a VA campus, a handful of older houses and two churches; no Eichler is among them, and the city has acknowledged it has no complete inventory of houses that might qualify. In August 2025 its Planning Commission voted 6–0 to permit the demolition of 1611 Oakdell Drive — one of Oakdell Park’s sixteen, the house Eichler Network had profiled as the tract’s original survivor, panelled in Philippine mahogany. The minutes record a discussion of trees, setbacks and neighbourhood fit. They do not mention that it was an Eichler.

A stronger ordinance that nobody has pointed at an Eichler protects exactly as much as a weaker one. What protects these houses in either town is an owner who wants them, and a sale run to find another one.

Menlo Park Eichler sales, from public records: 961 Peninsula Way, 2,010 square feet on 0.46 acre, $5,360,000 in June 2025. 805 Evergreen Street, 2,705 square feet on a 10,010-square-foot lot, $5,250,000 in October 2025. 645 Evergreen Street, 2,000 square feet, $4,800,000 in July 2022. 1611 Oakdell Drive, 1,610 original square feet, listed at $4,200,000 in January 2025 and sold — then approved for demolition seven months later.

In Atherton, we listed 19 Irving Avenue at $6,385,000 in March 2024, and 47 Placitas Avenue was listed by another brokerage at $4,788,000 the same month.

Per square foot the two towns are closer than the headline prices suggest — the Menlo Park sales above work out between roughly $1,900 and $2,700 a foot. What Atherton adds is land: an empty Atherton acre has sold for $9.5 and $10.7 million, which is the pressure every Atherton Eichler lives under and the reason so few are left.

We do not blend these numbers or quote Redfin figures, and we give each one its date.

Menlo Park’s Eichlers are ordinary houses on ordinary lots, so the replacement is a bigger house — Eichler Network describes spec builders replacing them with houses up to three times the size. There are enough of them that losing one is a loss to a street rather than to a record.

Atherton’s are one-offs, and the replacement is not a bigger house but an estate: the land alone is worth more than the house on almost any arithmetic. There are so few that each one lost takes a meaningful share of what exists with it. Five already have gone.

If you own one in either town, the practical lesson from both is the same, and it is not about the code. Document the house, decide before you list whether you are selling a house or a lot, and market it to the buyer you actually want. That is what we did with Joe Eichler’s own.