Santa Clara County  »  521 S Castlerock Trl

521 South Castlerock Trl, Sunnyvale, CA 94087 - Property report

Also known as: 521 S Castlerock Trl

Property image for 521 South Castlerock Trl, Sunnyvale, CA 94087
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General Information

Address
Primary address
521 S Castlerock Trl
Sunnyvale, CA 94087
Zip code
94087
County
Santa Clara
Municipality
Sunnyvale
Parcel ID
323-11-016
Tract
4891

Owner

Find out who owns 521 South Castlerock Trl, Sunnyvale, CA 94087. Uncover corporate and individual owners with a free account.

Tax
Tax year
2025-2026
Property tax
$2,090
Building
Property type
Condominium, Townhouse
Lot
Acreage
0.046
Zoning & use
Zoning
Low Medium Density Residential (R2)

Area overview

Walk score
52 /100.  Somewhat Walkable
Transit score
34 /100.  Some Transit
Bike score
75 /100.  Very Bikeable
School district
09009
Ownership

Ownership information for 521 South Castlerock Trl, Sunnyvale, CA

Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 521 South Castlerock Trl, Sunnyvale, CA 94087

No recently recorded sales for this property.

More about Santa Clara County property records.

Title documents

Date Type Amount Party 1 Party 2
11/30/2020 Trust Transfer Deed XXXXXXX XXXXXX XXXXX XXXXXXX, XXXX XXXXXX
10/12/2016 Affidavit Death Settlor/Truste XXXXXXX XXXXXX XXXXX XXXXX, XXXX XXXXXXX
03/21/2012 Grant Deed XXXXXXX XXXXX XXXXXXX, XXXXXX XXXXXXX XX XX
03/21/2012 Affidavit XXXXXXX XXXXX XXXXXXX XXXXX
02/09/2012 Deed XXXXXXX, XXXXXX X XXXXXXX XXXXX
02/09/2012 Deed of Trust/Mortgage/Securit XXXXXXX, XXXXXX X XXXXX XXXXX XX
02/09/2012 Deed XXXXXXX, XXXXXX XXXXXXX XX XX XXXXXXX, XXXXXX X
02/09/2012 Affidavit Death Settlor/Truste XXXXXXX, XXXXXX X XXXXXXX, XXXXXX X XX
02/14/2003 Deed XXXXXXX, XXXXXX X & XXXXX X XXXXXXX, XX
12/06/2002 Deed XXXXXXX, XX XXXXXXX, XXXXXX X & XXXXX X

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 521 South Castlerock Trl, Sunnyvale, CA

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2025-2026
Property tax
$2,090
Recent tax assessments
Market value
$179,690
Land value
$37,859
Building value
$141,831

More about Santa Clara County property taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Assessed value Tax rate Property tax Y-o-Y change
2025-2026 $179,690 1.1632 $2,090 +2.79%
2024-2025 $176,167 1.1543 $2,033 +0.48%
2023-2024 $172,714 1.1717 $2,024 +1.83%
2022-2023 $169,328 1.1736 $1,987 +0.87%
2021-2022 $166,009 1.1869 $1,970 +1.14%
2020-2021 $164,308 1.1854 $1,948 +2.33%
2019-2020 $161,088 1.1816 $1,903 +2.41%
2018-2019 $157,930 1.1769 $1,859 +0.47%
2017-2018 $154,834 1.1948 $1,850 +2.92%
2016-2017 $151,799 1.1841 $1,797 +0.56%
Permits

Permit information for 521 South Castlerock Trl, Sunnyvale, CA

Issued date Permit number Permit type Sub type Valuation Finaled date Status
10/21/2024
05/10/2011

*Most recent permits on record for this property.

Neighborhood

Risk

Create a free account to unlock expanded risk information, such as crime incidents in the area, tsunami and landslides risks, or its location relative to FEMA flood zones and the Coastal Barriers Resources System Area (COBRA).

FEMA flood zones

FEMA flood zones
0.2
Landslides and liquefaction map

Fire hazard zones

Faults and tsunami inundation zones map

Transportation

Daily traffic map
View daily traffic map

Access the detailed traffic volume map for 521 South Castlerock Trl, Sunnyvale, CA 94087 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.

Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
Chester W. Nimitz Elementary School 6 Public K-5 419 0.13
Amrita Academy NR Private 5-12 0 0.26
Louis E. Stocklmeir Elementary School 8 Public K-5 822 0.35
Resurrection Elementary School NR Private PK, K-8 221 0.48
Resurrection Elementary School NR Private PK, K-8 221 0.48
Adult And Community Education NR Public 0 0.52
French American School Of Silicon Valley NR Private PK-5 162 0.64
French American School Of Silicon Valley NR Private PK-5 162 0.64
Garden Gate Elementary School 8 Public K-5 517 1.28
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Amrita Academy NR Private 5-12 0 0.26
Resurrection Elementary School NR Private PK, K-8 221 0.48
Adult And Community Education NR Public 0 0.52
Challenger - Sunnyvale NR Private PK, K-8 554 0.74
Sam H. Lawson Middle School 9 Public 6-8 816 1.29
South Peninsula Hebrew Day School NR Private PK-8 247 1.34
Marian A. Peterson Middle School 6 Public 6-8 729 1.37
Sunnyvale Middle School 6 Public 6-8 962 1.44
Stratford Middle School NR Private 6-8 443 1.45
Cupertino Middle School 7 Public 6-8 1,099 1.47
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Amrita Academy NR Private 5-12 0 0.26
Fremont High School 7 Public 9-12 2,171 0.38
North County Regional Occupational Program School NR Public 9-12 0 0.45
Community Day School NR Public 9-12 7 0.45
Adult And Community Education NR Public 0 0.52
Homestead High School 8 Public 9-12 2,311 1.13
Silicon Valley Academy NR Private K-12 121 1.63
School of Choice NR Private 6-12 0 1.65
Alta Vista High School 4 Public 9-12 69 1.89
Futures Academy - Cupertino NR Private 7-12 55 1.90

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 521 South Castlerock Trl, Sunnyvale, CA

520 S Cashmere Trl, Sunnyvale 517 S Castlerock Trl, Sunnyvale 511 N Castlerock Trl, Sunnyvale 522 N Castlerock Trl, Sunnyvale 1323 Victoria Trl, Sunnyvale 502 S Cascade Trl, Sunnyvale 525 S Castlerock Trl, Sunnyvale 520 S Castlerock Trl, Sunnyvale 519 Cheyenne Dr, Sunnyvale 1452 Yukon Dr, Sunnyvale 526 W Fremont Ave, Sunnyvale 519 N Castlerock Trl, Sunnyvale 524 S Castlerock Trl, Sunnyvale 518 N Castlerock Trl, Sunnyvale 514 N Castlerock Trl, Sunnyvale 507 N Castlerock Trl, Sunnyvale 518 N Cashmere Trl, Sunnyvale 506 N Cashmere Trl, Sunnyvale 515 Cheyenne Dr, Sunnyvale 1319 Victoria Trl, Sunnyvale

Nearby ZIP codes for 521 South Castlerock Trl, Sunnyvale, CA

94022, Santa Clara County, CA 94024, Santa Clara County, CA 94041, Santa Clara County, CA 94043, Santa Clara County, CA 95002, Santa Clara County, CA 95014, Santa Clara County, CA 95070, Santa Clara County, CA 95117, Santa Clara County, CA 95128, Santa Clara County, CA 95129, Santa Clara County, CA 95130, Santa Clara County, CA

Frequently asked questions

What is the assessed value of 521 South Castlerock Trl, Sunnyvale, CA 94087?

521 South Castlerock Trl, Sunnyvale, CA 94087 is currently assessed at $179,690.

What are the property taxes for 521 South Castlerock Trl, Sunnyvale, CA 94087?

The property taxes for 521 South Castlerock Trl, Sunnyvale, CA 94087 total $2,090.

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