Blog · October 14, 2026 · California
Reading the Menlo Park Plat Map for a lot
Lots in Menlo Park trace back to recorded plats filed with the county.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If a legal description for land in Menlo Park cites a lot number, look up the Menlo Park plat map it refers to. In this Menlo Park guide: where plats are filed, plat versus tax map, and the details that matter to buyers.
The Menlo Park plat map: start here
For land around San Carlos, look for the plat book reference on the parcel record; bring that to the recorder's office or its online index.
Pulling up a parcel
Go first to the San Mateo County parcel viewer; it includes every tax parcel in the county, Atherton included. For acreage around Redwood City, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. In and around Foster City, the record panel usually lists the owner of record, acreage on the tax roll, a parcel ID and often a sale date.
Reading the legal description
California is laid out under the Public Land Survey System, so rural legal descriptions near Foster City cite section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though corrections make some sections near Woodside odd-sized. Write down the legal description for the tract near San Carlos for any title or survey request.
Replats and vacations
Lots near Atherton can be combined or reconfigured by a replat, search the index for replats of the same subdivision; street vacations show up in the records too.
City limits and county records
Menlo Park sits in San Mateo County, California, so its parcels are on the county's map. On ground around San Carlos, City or town hall handles matters such as zoning, permits and utilities inside its limits, while the county keeps the tax map. Acreage past the city limits toward Foster City generally follows county rules instead.
When a parcel crosses a boundary
San Mateo County touches Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County; every one of them runs a separate parcel map. Acreage along the edge near Redwood City can show up in two county records, so look at the neighboring map too. Around Woodside, the Platbookmapper state page links every neighboring county map across California.
A word on accuracy
Listed acreage is a tax-roll number; only a licensed surveyor can set the real boundary for a parcel near San Carlos. For acreage around San Carlos, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Metes and bounds instead
Rural land near Woodside that was never subdivided may have no plat at all; look for a recorded survey for land near San Carlos.
Plat map vs. parcel map
If the tax map and plat differ near San Carlos, trust the recorded documents over the GIS layer.
San Mateo County in a few facts
Redwood City serves as the county seat, home to the main records offices. You'll also find East Palo Alto, Atherton, and San Carlos, where town lots give way to larger tracts. Around 726,353 people call San Mateo County home (Census Bureau estimate, 2023) spread over some 449 square miles. Landmarks such as Don Edwards San Francisco Bay National Wildlife Refuge are easy to spot when you zoom out from Atherton.
Field tips
The parcel map usually runs in a mobile browser, which helps when you're standing on land near San Carlos, so load it before you lose signal. A screenshot of the parcel near San Carlos with its ID helps when you meet an owner or agent.
Which office to call
If the acreage or value on a parcel near Woodside looks off go to the County Assessor, which maintains the tax roll. Zoning, permits and septic questions near East Palo Alto are for the local planning and health departments, and the answer depends on jurisdiction.
What a plat shows
Closer to Woodside, the sheet usually includes lot and block numbers, dimensions and bearings, street rights-of-way and easements.
Requesting the plat
In and around East Palo Alto, many recorder offices offer an online index, while others require a visit or a request; copy fees are usually small.
Deeds, plats and who keeps them
The map is an index, not the title: deeds, plats and easements for land near East Palo Alto are kept by the County Recorder. Long-held tracts around Redwood City can go back through several deeds, so a title company can sort it out if money is changing hands.
Menlo Park: common questions
What is a replat for land near Foster City?
Short answer: combining or splitting lots near Woodside usually needs a recorded plat change.
How do I get a copy of a plat in Menlo Park?
Recorded plats near Woodside are filed with the County Recorder.
How is a plat different from the parcel map near Foster City?
Good question; the plat near Woodside is recorded, while the GIS layer is an approximation; trust the plat when they differ.
What do the dashed lines on a plat mean near Foster City?
In most cases, building on an easement near Foster City is generally restricted; ask planning staff if unsure.
Can I settle a boundary dispute with the map near Woodside?
No; boundary questions near Woodside need a licensed surveyor, so a fence may sit off the line
Open the official San Mateo County, CA parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.