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Property profile & analytics
FOR LEASE
Office buildings
21688 Gateway Center Dr, Diamond Bar, CA 91765
Entity Owned
2-yr Hold
Absentee Owner
~
Est. High Equity
Property ID
US09-7491985
For Lease
1 / 3
$22,535,000
21688 Gateway Center Dr, Diamond Bar, CA 91765
View Listing →
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
8293-050-045
UPID
US09-7491985
Cap rate & NOI
Priority signal for investors
Implied cap rate, NOI & suggested price
Cap rate vs submarket · NOI estimate · 3 price anchors
Implied cap rate, NOI & suggested price
Cap 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
by Request
Blend (final)
Blend
$22.54M
Owner & transaction history
21688 Gateway LLC · 2 yrs held
21688 Gateway LLC
since 2023
Last sale
$23.0M
7 recorded transactions
Zoning & alternative use
LCR110000* · Diamond Bar, CA
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Cap rate
Implied · in-place · derived from last sale + estimated NOI
Implied Cap rate
#1
Implied · in-place · NOI ÷ last sale
In-place · derived from last sale + estimated NOI
Cap rate, NOI & submarket benchmark
Implied cap rate vs Diamond Bar submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Diamond Bar submarket · NOI estimate · typical band, median & reading
Refine your cap rate
8-question underwriting flow
1.
Property current status — Going-In vs Stabilized
2.
Price for denominator — asking / offer / market
3.
Leasing status & lease structure (NNN / Gross)
4.
Tenant risk profile & vacancy assumption
5.
Upload T12 / rent roll / OM (optional)
Refine in 60 seconds, get exact suggested price
T12 upload · Submarket benchmarks · Sensitivity grid
Suggested price · 3 cap rate anchors
Income approach @ 5% / 7% / 9% — aggressive / typical / conservative
Suggested price at 5% / 7% / 9% cap
Aggressive / typical / conservative · Implied $/SF per anchor · Sensitivity grid
Suggested price at 5% / 7% / 9% cap
Aggressive / typical / conservative · implied $/SF · sensitivity
Value
AI, CAP & Alternative Use estimations · Realmo proprietary blendValue Estimations
Based on Realmo’s proprietary methodology
AI Approach
Method
Estimation
Statistic approach
$21,845,000
ML approach
by Request
CAP Approach
CAP Return
Estimation
6%
$24,150,000
6.5%
$22,295,000
7%
$20,700,000
Blend value · Realmo final
$22.54M
Range $20.28M – $24.79M · ±10% · vs last sale $23.00M (Jul 3 2023)
Last sale anchor
$23.00M
Jul 3 2023
Realmo estimate · informational only.
These numbers are calculated by our models from public records and may not reflect actual market value.
Not an appraisal.
Verify with a licensed appraiser before transacting. Realmo accepts no liability for divergence from real-world outcomes.
View the full estimation — every method, every assumption
Confidence drivers & risk notes · Custom comparable set · Free for first 3 / day
Full estimation methodology
Every method · every assumption · confidence drivers
Price per SF
Sale + rent benchmarks
Subject property
$268 / SF
Submarket sale & rent benchmarks
Median sale $/SF · Asking & closed rent · Submarket vacancy
Submarket sale & rent benchmarks
Median sale $/SF · asking & closed rent · submarket vacancy
Property tax & assessments
Tax year 2024Property tax & assessments
Tax year 2024
Tax billed
$175,092
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
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
Recent comparable sales
Sale price & $/SF · sale date & distance · adjustments
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
Total area
84,188 SF
Lot
1.2 ac (52,152 SF)
Zoning code
LCR110000*
APN
8293-050-045
UPID
US09-7491985
Jurisdiction
LOS ANGELES
Metro division
LOS ANGELES-LONG BEACH-GLENDALE, CA METROPOLITAN DIVISION
Zoning & alternative use
LCR110000* · Diamond Bar, CA
Zoning LCR110000* · permitted uses
LCR110000* · Diamond Bar, CA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Diamond Bar. Always verify with local authorities before improvements.
Building & site characteristics
From public records
Year built
1999
Construction
TILT-UP CONCRETE
Heating
NONE
Lot
1.2 ac
Current owner
From public records · entity-resolved
21688 Gateway LLC
Entity
Mailing address
17560 ROWLAND ST, CITY OF INDUSTRY, CA 91748-1114
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2023
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
10 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Oct 10, 2025
—
21688 Gateway LLC
—
Deed
related
$15,000,000 · East West Bank
Jul 3, 2023
$23,000,000
21688 Gateway LLC
Bsp Senita Gateway Center LLC
Grant Deed
$120,000,000 · East West Bank
Jan 15, 2016
$44,000,000
Bsp Senita Gateway Center LLC
Db Gateway Corp INC
Trustees Deed
$27,500,000 · California Bk&tr
Mar 26, 2008
—
Db Gateway Corporate INC
—
Grant Deed
related
$20,000,000 · Miscellaneous Ins Co
Dec 24, 2007
$48,500,000
Db Gateway Corporate INC
Gem Gateway Ltd INC
Grant Deed
—
Oct 1, 2002
—
Gem Gateway Ltd
Triple T Diamond Gateway LLC
Grant Deed
$17,500,000 · Citicorp USA Corp
Mar 11, 1999
—
Triple T Diamond Gateway LLC
—
Grant Deed
related
$19,500,000 · Sanwa Bank California
Nov 10, 1998
—
Redevelopment Agcy Diamond Bar
Diamond Bar Business Assoc
Quit Claim Deed
related
—
Aug 16, 1996
—
Diamond Bar Business Asso
Diamond Bar Business Asso,
Quit Claim Deed
related
—
Dec 22, 1989
$746,500
Diamond Bar Business Assoc
Unknown
Grant Deed
—
Coming soon
Costs & Benchmarks
Operating expenses, capex projections, utility benchmarks, and submarket comparables — all in one view.
Coming soon
Risks
Flood, climate, environmental, title, and tenant-concentration risk — surfaced with mitigations and source citations.
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“Is 15.6% cap rate sustainable?” · “Best tenant mix for BU1?” · “What’s the redev upside?”
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