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Property profile & analytics
OFF-MARKET
Estimated value
$575,000
Office Spaces
1100 Sonoma Ave A Santa Rosa, CA 95405-8901
Trust Owned
7-yr Hold
Free & Clear
Property ID
US09-3840983
Property profile
Verified
Property type
Office Spaces
Use group
CONDOMINIUM OFFICES
Year built
1982
Construction
WOOD
Total area
2,346 SF
APN
014-121-024-000
UPID
US09-3840983
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
-
Santa Rosa Dentistry Dental Office
-
Duane J. Phillips Inc., CPAs Accounting Firm
-
Colombo Wyvonne Dental Office
-
Dr. Kasia Marelich Dental Office
-
Dr. Christine Ford Dental Office
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
$545k
Comparable Approach
Comparable
$570k
Blend (final)
Blend
$575k
Owner & transaction history
Ellefson,thomas P & Laura D Trust · 7 yrs held
Ellefson,thomas P & Laura D Trust
since 2019
2 recorded transactions
Zoning & alternative use
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Medical building
$860,000
+92.1%
Auto repair, garage
$675,000
+50.7%
Retail stores
$650,000
+45.3%
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 Santa Rosa submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Santa Rosa 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
by Request
CAP Approach
CAP Return
Estimation
6%
$590,000
6.5%
$545,000
7%
$505,000
Alternative Use
Use
Estimation
OFFICE BUILDING
$450,000
Current use
MEDICAL BUILDING
$860,000
Change: +92% · Conversion: Easy
AUTO REPAIR, GARAGE
$675,000
Change: +51% · Conversion: Difficult
RETAIL STORES
$650,000
Change: +45% · Conversion: Moderate
COMMERCIAL (GENERAL)
$635,000
Change: +42% · Conversion: Easy
WAREHOUSE, STORAGE
$505,000
Change: +12% · Conversion: Difficult
Blend value · Realmo final
$575k
Range $518k – $633k · ±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
$245 / 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
$11,281
Tax year 2024
Assessed value
$981,651
Assessed 2024
Previous assessed
$981,651
+0.0% YoY
Effective rate
1.15%
On assessed value
Assessed land
$278,877
Assessed improvement
$702,774
Applied tax rate
4.0000
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
Similar Nearby for Sale
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 Spaces
Use group
CONDOMINIUM OFFICES
Status
Off-Market
Year built
1982
Construction
WOOD
Heating
NONE
Stories
1
Total area
2,346 SF
APN
014-121-024-000
UPID
US09-3840983
Jurisdiction
SONOMA
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
$450,000
MEDICAL BUILDING
Est. value
$860,000
AUTO REPAIR, GARAGE
Est. value
$675,000
RETAIL STORES
Est. value
$650,000
COMMERCIAL (GENERAL)
Est. value
$635,000
WAREHOUSE, STORAGE
Est. value
$505,000
OFFICE BUILDING Current
MEDICAL BUILDING
AUTO REPAIR, GARAGE
RETAIL STORES
COMMERCIAL (GENERAL)
WAREHOUSE, STORAGE
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
1982
Construction
WOOD
Heating
NONE
Stories
1
Current owner
From public records · entity-resolved
Ellefson,thomas P & Laura D Trust
Trust
Free & Clear · 7 yrs held
Mailing address
1100 SONOMA AVEA, SANTA ROSA, CA 95405-8901
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
Apr 19, 2019
—
Ellefson,thomas P & Laura D Trust
Ellefson,thomas & Laura
Quit Claim Deed
related
—
Aug 18, 2017
$880,000
E & M Property Holdings LLC
Mlynarczyk Gregory & Laur
Grant Deed
$704,000 · Bank Of America
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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