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Property profile & analytics
OFF-MARKET
Estimated value
$530,000
Office buildings
20638 Patio Dr, Castro Valley, CA 94546-5606
Entity Owned
5-yr Hold
Free & Clear
Property ID
US09-8014887
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1973
Construction
WOOD
Total area
2,305 SF
Lot
0.2 ac (8,814 SF)
APN
84A-80-21-1
UPID
US09-8014887
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
$545k
CAP Approach
CAP
$590k
Comparable Approach
Comparable
$616k
Blend (final)
Blend
$530k
Owner & transaction history
RT Nahas Co · 5 yrs held
RT Nahas Co
since 2021
Last sale
$530,000
4 recorded transactions
Zoning & alternative use
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Auto repair, garage
$850,000
+14.0%
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 Castro Valley submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Castro Valley 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
$510,000
ML approach
$545,000
CAP Approach
CAP Return
Estimation
6%
$640,000
6.5%
$590,000
7%
$550,000
Alternative Use
Use
Estimation
OFFICE BUILDING
$745,000
Current use
AUTO REPAIR, GARAGE
$850,000
Change: +14% · Conversion: Difficult
RETAIL STORES
$670,000
Change: -11% · Conversion: Moderate
COMMERCIAL (GENERAL)
$635,000
Change: -15% · Conversion: Easy
MEDICAL BUILDING
$615,000
Change: -18% · Conversion: Easy
Blend value · Realmo final
$530k
Range $477k – $583k · ±10% · vs last sale $530k (Jan 13 2021)
Last sale anchor
$530k
Jan 13 2021
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
$230 / 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 2023Property tax & assessments
Tax year 2023
Tax billed
$9,274
Tax year 2023
Assessed value
$591,214
Assessed 2024
Previous assessed
$579,623
+2.0% YoY
Effective rate
1.57%
On assessed value
Assessed land
$440,622
Assessed improvement
$150,592
Applied tax rate
54.0000
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
1973
Construction
WOOD
Heating
NONE
Buildings
1
Stories
1
Units
1
Total area
2,305 SF
Lot
0.2 ac (8,814 SF)
APN
84A-80-21-1
UPID
US09-8014887
Jurisdiction
ALAMEDA
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
$745,000
AUTO REPAIR, GARAGE
Est. value
$850,000
RETAIL STORES
Est. value
$670,000
COMMERCIAL (GENERAL)
Est. value
$635,000
MEDICAL BUILDING
Est. value
$615,000
OFFICE BUILDING Current
AUTO REPAIR, GARAGE
RETAIL STORES
COMMERCIAL (GENERAL)
MEDICAL BUILDING
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
1973
Construction
WOOD
Heating
NONE
Stories
1
Buildings
1
Units
1
Lot
0.2 ac
Current owner
From public records · entity-resolved
RT Nahas Co
Entity
Free & Clear · 5 yrs held
Mailing address
504 W 5TH ST, CARSON CITY, NV 89703-4676
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
4 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Jan 13, 2021
—
RT Nahas Co
Castro Village INC
Quit Claim Deed
—
Apr 2, 2018
$530,000
Castro Village INC
Hemming Trust
Grant Deed
—
Mar 1, 2017
$530,000
Hemming Trust
Eden Managements
Grant Deed
—
Feb 26, 1973
—
Eden Managements & Peralta Land Co
—
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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