Office buildings
Entity Owned
2-yr Hold
Absentee Owner
Free & Clear
Entity Owned 
For Lease
1 / 5
Contact for pricing
21680 Gateway Center Dr, Diamond Bar, CA 91765
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Property summary
AI-generated overview
Gateway Corporate Center, located at 21680 Gateway Center Drive in Diamond Bar, California, 91765, offers prime executive office space for lease. This Los Angeles County property boasts a total of 10,164 square feet, with multiple tenancy options available. Currently, there are 5,782 square feet of vacant space ready for immediate occupancy. Individual suites range from a minimum of 2,596 square feet to a maximum contiguous space of 3,186 square feet, providing flexibility for businesses of varying sizes. The building provides ample parking, with a ratio of 5 spaces per 1,000 square feet. The property's convenient location in Diamond Bar offers easy access to major transportation routes and local amenities. This is an exceptional opportunity to establish a presence in a well-maintained and strategically located executive office building. The property is classified as an Office building with an Executive Office subtype. Interested parties are encouraged to inquire about available space and lease terms. The property is situated in Los Angeles County and offers a professional environment ideal for businesses seeking a prestigious address. Contact us today to schedule a viewing and explore the possibilities.
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING (MULTI-STORY)
Year built
1999
Construction
TILT-UP CONCRETE
Total area
84,188 SF
Lot
1.2 ac (52,152 SF)
Zoning code
LCR110000*
APN
8293-050-044
UPID
US09-8723574
Cap rate & NOI
Priority signal for investors
Implied cap rate, NOI & suggested price
Cap rate vs submarket · NOI estimate · 3 price anchors
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
$22.30M
Comparable Approach
Comparable
$12.23M
Blend (final)
Blend
$17.83M
Owner & transaction history
since 2024
2 recorded transactions
Zoning & alternative use
LCR110000* · Diamond Bar, CA
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
Similar Nearby for Sale
Similar Nearby for Lease
Recent comparable sales
Sale price & price/SF · Sale date & distance · Adjustments & confidence
Value estimation
Instant AI valuation built from comps, income signals, and proprietary benchmarks. A defensible range, not a single guess.
17% off on annual
Unlock the complete Valuation workflow
Full NOI reconstruction, selected comps, alternative-use scenarios, data audit and PDF export.
Full NOI build-up · 6 steps
All 9 comparables with addresses
Sensitivity value band
Source audit · 10 inputs
PDF export
Analytics Standard · 5 reports
from $99/month
from $99/month
Summary
1
Valuation conclusion
Included free
Estimated market value
$17.83M
Value range
$16.05M – $19.61M
±10% around blend
Estimated value / SF
$212 / SF
Confidence
High
9 county-verified comps
Property data
75
Market benchmarks
100
Comparable evidence
90
Income certainty
100
$16.05M
blend $17.83M
$19.61M
Market-derived valuation under stabilized market assumptions. Desktop analysis. No physical inspection performed.
2
Subject property
Included free
GBA
84,188 SF
Lot area
1.2 ac
Year built
1999
APN
8293-050-044
Assessed value
$12,995,793
Annual tax
$175,018
3
Income approach: direct capitalization
Partial preview
Income approach indication
$22.30M
Direct capitalization · @ 6.5% CAP return
@ 6% CAP return
$24.15M
@ 6.5% CAP return
$22.30M
@ 7% CAP return
$20.70M
Estimated Stabilized NOI, derived from market rent, vacancy and expense benchmarks. Actual property income not reported.
Estimated market rent / SF
Potential gross income
Vacancy allowance
Effective gross income
Benchmark operating expenses
Stabilized NOI
Property tax
$175,018
Selected cap rate
4
Sales comparison
Partial preview
Sales approach indication
$14.08M
Weighted, 9 comps · high confidence
Evidence
9 found · 6 selected
County-verified recorded sales
Comparable
Sale dateSale price$ / SF
22.0 mi away · 86,790 SF
24.9 mi away · 65,246 SF
28.9 mi away · 72,171 SF
29.5 mi away · 74,457 SF
29.6 mi away · 75,693 SF
5
Sensitivity & risk
Partial preview
Downside
−10%
Base
$17.83M
Upside
+10%
Bounds of the ±10% band vs the blend — never simulated scenarios.
6
Current market position
Included free
Benchmark
Observed band ($/SF)AverageSubject delta
ZIP 42 sales
$510
-58%
Submarket 106 sales
$400
-47%
County 2758 sales
$449
-53%
Band = middle half (Q1–Q3) of recorded sale $/SF for this use type per geography; the diamond marks the subject at $212/SF. Delta below average reads as headroom. Source: Realmo CRE sales derivatives (county records).
7
Data & methodology
Included free
Building area
County record
Property tax
County record
Assessed value
County record
Zoning designation
Not available
Operating expenses
Modeled
Market rent
Market benchmark
Actual rent roll
Not available
Tenant leases
Not available
Physical condition
Not inspected
Conversion costs
Not available
Not analyzed due to unavailable source data: tenant leases, physical condition and capital
requirements were not available for this desktop analysis. Cost Approach excluded due to
availability of income evidence.
Automated valuation analysis, not a licensed appraisal. Figures are derived from public
records and proprietary models. Desktop analysis: no physical inspection, tenant leases or reported
property income. Verify with a licensed appraiser before transacting.
Cap rate
Cap rate calculated from real income and expense signals, benchmarked against sales of similar assets nearby.
17% off on annual
Unlock the complete Cap Rate workflow
Full market tables, editable assumptions, comparable evidence, saved work and exports.
9-scenario matrix
Comparable evidence · 9 sales
NOI build-up · 9 steps
Market rates by use type
PDF export
Analytics Standard · 5 reports
from $99/month
from $99/month
Overview
No cap rate is computable for this property yet: no recorded sale, income signal or market-rate row for its use type.
Price sensitivity
The rate is the decision lever; valuation is the consequence.
Test a cap rate
Implied value$811k
Move the market yield to see immediate price impact.
Value / SF
$10
Vs. selected
Base
Derivation
NOI ÷ cap
Arithmetic over the derived NOI * — not market scenario modeling.
NOI × cap matrix
Preview
Preview of 9 modeled outcomes.
NOI
5.00%7.00%9.00%
$51k
$1.02M
$730k
$567k
$57k
$1.13M
$811k
$631k
$62k
$1.25M
$892k
$694k
NOI sensitivity ±10% across the 5 / 7 / 9% anchors — derivation of the NOI above.
Comparable evidence
Partial preview
Recorded sales nearby
9 found
High confidence · county-verified
Closest comparable
$10.20M
13.9 mi · Sep 2025 · $126/SF
Property tax & assessments
Tax year 2024Property tax & assessments
Tax year 2024
Tax billed
$175,018
Tax year 2024
Assessed value
$12,995,793
Assessed 2024
Previous assessed
$12,995,793
+0.0% YoY
Effective rate
1.35%
On assessed value
Assessed land
$2,788,796
Assessed improvement
$10,206,997
Applied tax rate
10.0000
Automated cap rate analysis. Based on public records, market benchmarks and proprietary
models. Verify with a licensed professional before transacting.
Property description
Physical attributes from public recordsBuilding & lot
Public records
Property type
Office buildings
Use group
OFFICE BUILDING (MULTI-STORY)
Status
For Lease
Year built
1999
Construction
TILT-UP CONCRETE
Heating
NONE
Units
1
Total area
84,188 SF
Lot
1.2 ac (52,152 SF)
Zoning code
LCR110000*
APN
8293-050-044
UPID
US09-8723574
Jurisdiction
LOS ANGELES
Metro division
LOS ANGELES-LONG BEACH-GLENDALE, CA METROPOLITAN DIVISION
Zoning & alternative use
LCR110000* · Diamond Bar, CAZoning LCR110000* · permitted uses
LCR110000* · Diamond Bar, CA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Building & site characteristics
From public records
Year built
1999
Construction
TILT-UP CONCRETE
Heating
NONE
Units
1
Lot
1.2 ac
Zoning
The recorded zoning designation, what the district officially allows, and the municipal source it comes from.
Zoning designation
County-recorded code
LCR110000*
Jurisdiction
Diamond Bar, CA
Recorded code
LCR110000*
Zoning Insight
What can be built and operated here — officially.
The district profile from the municipal source: what is on file for LCR110000* in Diamond Bar, CA.
What opens after registration
Zoning profile
Official documentVerified municipal sources with file download
Match provenanceAssignment basis, match tier and confidence
Private report access
See the official zoning profile for this address.
Registration is required before the official district profile is shown.
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Ownership Intelligence
Find the owner behind the property.
Unlock the evidence behind ownership: portfolio, transactions, debt and signals that help you decide who to contact next.
What opens after registration
Ownership report
Owner identityResolved entity and name variants
Portfolio holdingsLinked properties and estimated value
Deal signalsSell-side activity worth following
Debt & historyRecorded loans and transaction history
Private report access
See the ownership record for this address.
Registration is required before any owner information is shown.
One complete report on every paid plan · 5 · 30 · 100 reports per month.
Owner of record and activity signals are derived from public records and modeled classifications.
They do not confirm beneficial ownership or intent to transact.
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