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Property profile & analytics
OFF-MARKET
Estimated value
$3,385,000
Apartment buildings
727 Duane Ave Sunnyvale, CA 94085-3361
Entity Owned
Absentee Owner
~
Est. High Equity
Property ID
US09-2812960
Property profile
Verified
Property type
Apartment buildings
Use group
APARTMENT HOUSE (5+ UNITS)
Year built
1958
Construction
WOOD
Total area
9,276 SF
Lot
0.45 ac (19,800 SF)
Zoning code
R3
APN
205-16-018
UPID
US09-2812960
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
by Request
CAP Approach
CAP
$3.02M
Comparable Approach
Comparable
$2.62M
Blend (final)
Blend
$3.39M
Owner & transaction history
Duane Holdings LLC
Duane Holdings LLC
since 2025
Last sale
$4.0M
7 recorded transactions
Zoning & alternative use
R3 · Sunnyvale, CA
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Retail stores
$5.1M
+23.8%
Industrial (general)
$4.3M
+4.4%
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 Sunnyvale submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Sunnyvale 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%
$3,270,000
6.5%
$3,015,000
7%
$2,800,000
Alternative Use
Use
Estimation
APARTMENT HOUSE (5+ UNITS)
$4,080,000
Current use
RETAIL STORES
$5,050,000
Change: +24% · Conversion: Difficult
INDUSTRIAL (GENERAL)
$4,260,000
Change: +4% · Conversion: Difficult
WAREHOUSE, STORAGE
$3,300,000
Change: -19% · Conversion: Difficult
Blend value · Realmo final
$3.39M
Range $3.05M – $3.72M · ±10% · vs last sale $3.95M (Dec 30 2025)
Last sale anchor
$3.95M
Dec 30 2025
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
$365 / 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
$18,553
Tax year 2024
Assessed value
$1,571,119
Assessed 2024
Previous assessed
$1,571,119
+0.0% YoY
Effective rate
1.18%
On assessed value
Assessed land
$755,272
Assessed improvement
$815,847
Applied tax rate
9.0000
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
Apartment buildings
Use group
APARTMENT HOUSE (5+ UNITS)
Status
Off-Market
Year built
1958
Construction
WOOD
Heating
NONE
Cooling
NONE
Stories
2
Units
12
Total area
9,276 SF
Lot
0.45 ac (19,800 SF)
Zoning code
R3
APN
205-16-018
UPID
US09-2812960
Jurisdiction
SANTA CLARA
Zoning & alternative use
R3 · Sunnyvale, CA
Zoning R3 · permitted uses
R3 · Sunnyvale, CA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Sunnyvale. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
APARTMENT HOUSE (5+ UNITS) Current
Est. value
$4.1M
RETAIL STORES
Est. value
$5.1M
INDUSTRIAL (GENERAL)
Est. value
$4.3M
WAREHOUSE, STORAGE
Est. value
$3.3M
APARTMENT HOUSE (5+ UNITS) Current
RETAIL STORES
INDUSTRIAL (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
1958
Construction
WOOD
Heating
NONE
Cooling
Yes
Stories
2
Units
12
Lot
0.45 ac
Current owner
From public records · entity-resolved
Duane Holdings LLC
Entity
Mailing address
3245 SIMBERLAN DR, SAN JOSE, CA 95148-3128
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2025
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
Dec 30, 2025
$3,950,000
Duane Holdings LLC
Ildefonso M Castillo
Grant Deed
$2,025,000 · Us Bank NA
Jun 15, 2022
—
Vicente M Songcayawon
Vicente M Songcayawon
Intrafamily Transfer
related
—
Dec 6, 2019
—
Vicente M Songcayawon
—
Deed
related
$2,675,000 · Mufg Union Bank NA
Apr 28, 2017
—
Vicente M Songcayawon
Ildefonso M Castillo
Intrafamily Transfer
related
$2,100,000 · Jpmorgan Chase Bank NA
May 4, 2000
—
Ildefonso M Castillo
Castillo,ildefonso
Quit Claim Deed
related
$150,000 · Bank Of Santa Clara
Apr 6, 1999
—
Idelfonso Castillo
Songcayawon,vincente M & Elsa P
Grant Deed
$725,000 · World Savings Bank
Apr 21, 1993
—
Ildefonso Castillo
Castillo,i.
Quit Claim Deed
related
—
Feb 23, 1993
—
Ildefon Castillo
—
Quit Claim Deed
related
$613,000 · San Francisco Federal S & L
Oct 19, 1990
$294,000
Ildefon Castillo
Equity Preservat
Grant Deed
related
—
—
—
Vicente M Songcayawon
—
Deed Of Trust
related
$1,250,000 · United Commercial Bank
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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