Diamond Bar Estates: mobile home park in Walnut, California
Unofficial page — independent directory built from the California state registry, updated August 2026.
Run this park? Correct anything on this page free — no card, no account.
A 133-space mobile home park in Walnut, CA. Everyday shopping is within a couple of miles.
FEMA's flood map puts this park in zone X, outside the mapped special flood hazard area — one less financing or insurance hurdle than a park in a hazard zone faces. Internet is a strength around here: about 100% of homes in town can get 100/20 Mbps service.
Los Angeles County has its own mobilehome rent-stabilization ordinance, but it only reaches unincorporated areas — worth a call to the county or to Walnut to confirm whether this park falls inside it. This mobilehome park carries 133 spaces on the registry, without a vacancy count to say how full it runs.
- Size
- 133 spaces · 110th largest of 556 in Los Angeles County (median 50)
- Size vs the state
- Larger than about 78% of California's registered parks
- Rent increases
- 75% CPI, 8% Cap (Los Angeles County ordinance — unincorporated areas only) · read it
- Rent nearby
- 2-bedroom fair market rent $2,601/mo (HUD FY 2026)
- Flood zone
- N/A — outside the mapped floodplain
- Wildfire risk
- Among the highest-risk counties in the U.S. (USFS, county-wide)
- Tornadoes
- 50 recorded in Los Angeles County since 1950, strongest F2 (NOAA)
- Nearest
- Grocery 0.5 mi · pharmacy 2.2 mi · clinic 0.8 mi
- School & ER
- Walnut Elementary 0.7 mi · San Dimas Community Hospital (ER) 6.3 mi
- Internet
- 100% of homes at 100/20 Mbps · fiber 32% · gigabit 32%
- Neighborhood
- Median rent $2,868/mo · median income $125,000 · 4% mobile homes
Distances are straight-line, so the drive is longer. Internet and neighborhood figures describe the surrounding town — and the rent benchmark, wildfire rank, and tornado count the wider county — not this park’s own lots. The fair market rent is apartment-style rent (HUD’s area benchmark), not this park’s lot rent. Rent limits are not legal advice.
Looking for the office number? Their Google Maps listing may have it →
Worth knowing
Walnut sits about 6 miles southwest of Pomona (about 150,000 people). 107 other registered parks lie within about 10 miles.
For residents
- Water billing: if your park submeters water, California bills it at the utility's rate with combined service and admin fees capped (AB 604) — no markup on the water itself. Check the math free with the water submeter calculator, or read the California water-billing guide.
- Paying rent: ask the park office how they take payment. Parks that run on Lot Sidekick hand residents clear, itemized rent and water bills.
- Thinking about moving here? What to ask a park before you rent a lot, and what lot rent covers and how it goes up.
Common questions
How many spaces does Diamond Bar Estates have?
Diamond Bar Estates has 133 total spaces per the California park registry (as of August 24, 2026).
Is this Diamond Bar Estates's official website or phone number?
No. This is Diamond Bar Estates's page in the Lot Sidekick park directory, built from the state registry. We're independent of the park and can't take messages for it. The park office hasn't added a public contact here yet; if you own the park, claiming the page (free) lets you add one.
Where is Diamond Bar Estates?
21217 E Washington, Walnut, California 91789, in Los Angeles County.
How much is lot rent at Diamond Bar Estates?
Diamond Bar Estates doesn't publish its lot rent anywhere we could find, and we won't guess at a figure. Call the park office to ask. For scale: HUD's FY 2026 fair market rent for a 2-bedroom rental around Los Angeles County is $2,601/mo — that's apartment-style rent for the area, and lot rent (the ground under a home you own) usually runs well below it. If you run this park, you can add your real lot rent to this page for free.
How much can lot rent go up at Diamond Bar Estates?
California has no statewide cap on space-rent increases, but the Mobilehome Residency Law requires 90 days' written notice (Civil Code §798.30), and many California cities add local rent-stabilization ordinances — check your city before assuming there's no cap.
Nearby parks in Los Angeles County
| Park | Distance | Spaces |
|---|---|---|
| Walnut Creek Mobile Estates | ~0.6 mi | 147 |
| Friendly Village West Covina MH Community | ~2.1 mi | 157 |
| Hi Lea Village Mobile Home Park | ~2.7 mi | 188 |
| Hillview MHP | ~2.8 mi | 59 |
| Walnut Hills MH Community | ~2.9 mi | 182 |
Free tools
- Park value & profitability estimator: what a 133-space park earns and what it's worth, at the cap rate you pick.
- Rent increase calculator: the 2026 California cap applied to a 133-space park.
- RUBS calculator: split one master-meter water bill across 133 lots so the pennies add up exactly.
- Water submeter calculator: two meter reads in, an at-cost tenant bill out.
- Notice generator: a clean, printable rent-increase notice with the dates filled in.
- Rent receipt generator: a printable receipt for a cash, check, or money-order payment — two copies to a sheet.
- Prorated rent calculator: the exact first-month charge when someone moves in mid-cycle.
Registry record
| State registry ID | 4395 |
|---|---|
| Registered with | The California Department of Housing and Community Development |
| Listed as | DIAMOND BAR ESTATES |
Data from official state registry that may be out of date.
Source: California Department of Housing and Community Development, Permit to Operate registry (gis.hcd.ca.gov), as of August 24, 2026. Counts come from the state's registry and can lag real life. See something out of date? Tell us, or claim the page.
https://lotsidekick.com/parks/california/los-angeles/diamond-bar-estates