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Property profile & analytics
OFF-MARKET
Office buildings
680 Brea Cyn Rd Ste 208 Diamond Bar, CA 91789-3005
Individually Owned
6-yr Hold
~
Est. High Equity
Property ID
US09-9955088
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
2015
Construction
WOOD
Total area
1,320 SF
Lot
0.95 ac (41,494 SF)
Zoning code
LCM1 1/2*
APN
8719-010-029
UPID
US09-9955088
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
by Request
Comparable Approach
Comparable
by Request
Blend (final)
Blend
by Request
Owner & transaction history
David Sang Lee · 6 yrs held
David Sang Lee
since 2019
2 recorded transactions
Zoning & alternative use
LCM1 1/2* · 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
CAP Approach
Comparable Approach
Alternative Use
Get a detailed, property-specific estimation — fast and free
Price per SF
Sale + rent benchmarks
Subject property
—
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
$8,424
Tax year 2024
Assessed value
$657,477
Assessed 2024
Previous assessed
$657,477
+0.0% YoY
Effective rate
1.28%
On assessed value
Assessed land
$35,345
Assessed improvement
$622,132
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
Status
Off-Market
Year built
2015
Construction
WOOD
Heating
NONE
Total area
1,320 SF
Lot
0.95 ac (41,494 SF)
Zoning code
LCM1 1/2*
APN
8719-010-029
UPID
US09-9955088
Jurisdiction
LOS ANGELES
Metro division
LOS ANGELES-LONG BEACH-GLENDALE, CA METROPOLITAN DIVISION
Zoning & alternative use
LCM1 1/2* · Diamond Bar, CAZoning LCM1 1/2* · permitted uses
LCM1 1/2* · Diamond Bar, CA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Building & site characteristics
From public records
Year built
2015
Construction
WOOD
Heating
NONE
Lot
0.95 ac
Current owner
From public records · entity-resolved
David Sang Lee
Individual
Mailing address
680 BREA CYN RD STE #208, WALNUT, CA 91789-3005
Mailing matches property
Yes
Owner-occupied
Yes
Ownership since
2019
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
2 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Aug 23, 2019
—
David Sang Lee
David Sang Lee
Intrafamily Transfer
related
$354,250 · Gbc International Bank
Jul 17, 2014
$558,000
David Lee
Brea Canyon Investment LLC
Grant Deed
$474,000 · Gbc International Bank
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.
Try Rey
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“Is 15.6% cap rate sustainable?” · “Best tenant mix for BU1?” · “What’s the redev upside?”
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