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Property profile & analytics
OFF-MARKET
Office buildings
1821 A St Antioch, CA 94509-2601
Individually Owned
4-yr Hold
Absentee Owner
~
Est. High Equity
Property ID
US10-2491631
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1942
Construction
WOOD FRAME
Total area
1,035 SF
Lot
0.11 ac (4,872 SF)
APN
068-011-036-8
UPID
US10-2491631
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
Current use
Occupant on record · Public records
-
Top Notch Garage Doors Repair Antioch Building Supply General Contractor
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
Julio Cesar Castaneda JR · 4 yrs held
Julio Cesar Castaneda JR
since 2021
Last sale
$235,000
7 recorded transactions
Zoning & alternative use
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 Antioch submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Antioch 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
$3,826
Tax year 2024
Assessed value
$296,494
Assessed 2024
Previous assessed
$296,494
+0.0% YoY
Effective rate
1.29%
On assessed value
Assessed land
$104,040
Assessed improvement
$192,454
Applied tax rate
1.0000
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
1942
Construction
WOOD FRAME
Heating
FLOOR/WALL FURNACE
Stories
1
Units
1
Total area
1,035 SF
Lot
0.11 ac (4,872 SF)
APN
068-011-036-8
UPID
US10-2491631
Jurisdiction
CONTRA COSTA
Metro division
OAKLAND-FREMONT-HAYWARD, CA METROPOLITAN DIVISION
Zoning & alternative use
Zoning · permitted uses
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
1942
Construction
WOOD FRAME
Heating
FLOOR/WALL FURNACE
Stories
1
Units
1
Lot
0.11 ac
Current owner
From public records · entity-resolved
Julio Cesar Castaneda JR
Individual
Mailing address
620 COPPER RDG WAY, OAKLEY, CA 94561-5098
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2021
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 14, 2021
$235,000
Julio Cesar Castaneda JR
Acrew Management LLC
Grant Deed
$164,500 · 401k Plan And Trust
Jul 17, 2020
—
Acrew Management LLC
Geoffrey H Saft
Quit Claim Deed
related
—
Apr 28, 2020
—
Geoffrey H Saft
Medallion Servicing LLC
Grant Deed
related
—
Mar 13, 2019
—
K B Lee Nguyen
—
Deed
related
$50,000 · Geoffrey H Saft
Dec 27, 2007
—
Nguyen K B Lee
Lee,donald D
Quit Claim Deed
related
—
Dec 27, 2007
$325,000
Nguyen K B Lee
Gunson,bob
Grant Deed
$260,000 · Imperial Lending LLC
Mar 25, 1994
$50,000
Tom Fougere
Travis,ruth B
Grant Deed
related
—
Jul 19, 1988
—
Ruth B Travis
—
Quit Claim Deed
related
$60,000 · Individual
—
—
K B Lee Nguyen
—
Deed Of Trust
related
$50,000 · Geoffrey H Saft
Dec 16, 1968
—
—
—
Grant Deed
related
—
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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