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Property profile & analytics
OFF-MARKET
Office buildings
511 3rd St Antioch, CA 94509-1275
Individually Owned
22-yr Hold
Absentee Owner
~
Est. High Equity
Property ID
US09-1400538
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1906
Construction
WOOD FRAME
Total area
1,687 SF
Lot
0.11 ac (5,000 SF)
APN
066-056-017-8
UPID
US09-1400538
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
-
Law Offices of Joel A. Harris Law Firm
-
Law Office of Michael J. Primus Law Firm
-
Bay Area Employment Lawyers Law Firm
-
Murphy Mark V Law Firm
-
Dr. Craig Curry, DDS Physician
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
Martin T Gonsalves · 22 yrs held
Martin T Gonsalves
since 2003
4 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
$4,255
Tax year 2024
Assessed value
$258,004
Assessed 2024
Previous assessed
$258,004
+0.0% YoY
Effective rate
1.65%
On assessed value
Assessed land
$86,893
Assessed improvement
$171,111
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
1906
Construction
WOOD FRAME
Heating
NONE
Stories
1
Total area
1,687 SF
Lot
0.11 ac (5,000 SF)
APN
066-056-017-8
UPID
US09-1400538
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
1906
Construction
WOOD FRAME
Heating
NONE
Stories
1
Lot
0.11 ac
Current owner
From public records · entity-resolved
Martin T Gonsalves
Individual
Mailing address
119 W 6TH ST, ANTIOCH, CA 94509-1751
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2003
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
4 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Dec 30, 2003
—
Martin T Gonsalves
Gonsalves,denise M
Quit Claim Deed
related
$135,000 · Bank Of America
Aug 25, 2003
—
Martin T Gonsalves
Huffaker,jeffrey D & Nancy S
Quit Claim Deed
related
—
Oct 13, 1989
$165,000
Jeffrey Huffaker
Coccimiglio,j.
Grant Deed
$48,000 · Individual
Mar 12, 1985
$60,000
John Coccimiglio
Bookman,robert
Grant Deed
$47,901
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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