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Property profile & analytics
OFF-MARKET
Estimated value
$505,000
Office buildings
928 Main St Martinez, CA 94553-1228
Individually Owned
Free & Clear
Property ID
US09-4886836
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1950
Total area
2,208 SF
Lot
0.05 ac (2,369 SF)
APN
373-266-002-6
UPID
US09-4886836
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
$320k
CAP Approach
CAP
$655k
Comparable Approach
Comparable
by Request
Blend (final)
Blend
$505k
Owner & transaction history
Ross
Ross
since 2026
5 recorded transactions
Zoning & alternative use
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Medical building
$800,000
+5.7%
Commercial (general)
$770,000
+1.3%
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 Martinez submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Martinez 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
by Request
ML approach
$320,000
CAP Approach
CAP Return
Estimation
6%
$710,000
6.5%
$655,000
7%
$610,000
Alternative Use
Use
Estimation
OFFICE BUILDING
$760,000
Current use
MEDICAL BUILDING
$800,000
Change: +6% · Conversion: Easy
COMMERCIAL (GENERAL)
$770,000
Change: +1% · Conversion: Easy
Blend value · Realmo final
$505k
Range $455k – $556k · ±10%
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
$229 / 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
$5,203
Tax year 2024
Assessed value
$372,895
Assessed 2024
Previous assessed
$372,895
+0.0% YoY
Effective rate
1.40%
On assessed value
Assessed land
$98,141
Assessed improvement
$274,754
Applied tax rate
5.0000
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
1950
Heating
NONE
Stories
1
Units
1
Rooms
1
Total area
2,208 SF
Lot
0.05 ac (2,369 SF)
APN
373-266-002-6
UPID
US09-4886836
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
Alternative use value scenarios
Repositioning upside vs current use
OFFICE BUILDING Current
Est. value
$760,000
MEDICAL BUILDING
Est. value
$800,000
COMMERCIAL (GENERAL)
Est. value
$770,000
OFFICE BUILDING Current
MEDICAL BUILDING
COMMERCIAL (GENERAL)
Alternative use deep dive — conversion cost, permits, timeline
Conversion cost estimate · Permit path & risks · Stabilized NOI per option
Alternative use deep dive
Conversion cost · permit path · stabilized NOI per option
Building & site characteristics
From public records
Year built
1950
Heating
NONE
Stories
1
Units
1
Rooms
1
Lot
0.05 ac
Current owner
From public records · entity-resolved
Ross
Individual
Free & Clear · 0 yrs held
Mailing address
928 MAIN ST, MARTINEZ, CA 94553-1228
Mailing matches property
Yes
Owner-occupied
Yes
Ownership since
2026
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
5 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Apr 10, 2026
$435,000
Ross
Martin Jennifer
Grant Deed
—
Dec 24, 2012
—
Martin Jennifer L Trust
Martin James D & D Y Trust
Quit Claim Deed
related
—
Oct 2, 1984
—
Martin,james D|martin,diane Y Tre Tr
—
Grant Deed
related
—
Oct 8, 1982
$141,000
Philip Solla
Hoey,francis
Grant Deed
$100,000
Oct 8, 1982
$80,000
Jame D Martin
Solla,philip
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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