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Single Family ResidenceResidential
$670,534$640 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026

521 OSAGE ST

SPRING VALLEY, CA 91977
3
Beds
1.5
Baths
1,048 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1960
Year BuiltThe year the home was originally built, according to county records.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$671K
$626K low$715K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,340 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$59,316 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$19,292
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$40,024
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$58,154

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.40
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
65
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
36
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
11
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
87
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySAN DIEGO
Lot (acres)The size of the land the home sits on, from county records.0.16
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Rancho Elementary SchoolD+
Elementary · Grades KG–5 · 0.1 mi
M
STEAM Academy at La PresaB-
Middle · Grades 6–8 · 1.0 mi
H
Mount Miguel High SchoolC-
High · Grades 9–12 · 1.4 mi

District: Grossmont Union High School District

Neighborhood · ZIP 91977These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.66
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.198

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.61,121
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,580 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$86,172
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$118,122
Average tempThe average temperature here across a full year.63°F
Annual precipHow much rain and melted snow falls here in a typical year.13 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.68%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

521 Osage St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth less than 75% of homes in San Diego County
  • Costs more per square foot than 96% of homes in La Presa
  • Smaller than 86% of homes in Spring Valley 91977
  • Has a smaller lot than 77% of homes in Spring Valley 91977
  • Older than 85% of homes in San Diego County

What homes are worth in Spring Valley 91977

Each bar is how many homes fall in that price range. The marker is this home.

This home
$415K$1.1M

This home is worth more than 49% of homes in Spring Valley 91977.

How it measures up in Spring Valley 91977

The dot is this home. The mark in the middle is the typical home in Spring Valley 91977.

Estimated value$670,534
CheaperTypical $671,883Pricier

Pricier than 49% of homes nearby

Price per ft²$640
CheaperTypical $457Pricier

Pricier than 96% of homes nearby

Living area1,048 ft²
SmallerTypical 1,476 ft²Bigger

Bigger than 14% of homes nearby

Lot size0.16 ac
SmallerTypical 0.23 acBigger

Bigger than 23% of homes nearby

Year built1960
OlderTypical 1976Newer

Newer than 26% of homes nearby

How 521 Osage St ranks against every home in each area.
MeasureThis homeLa PresaSpring Valley 91977San Diego County
Estimated valuepricier than$670,53459% of homes49% of homes25% of homes
Price per ft²pricier than$64096% of homes96% of homes66% of homes
Living areabigger than1,048 ft²15% of homes14% of homes22% of homes
Lot sizebigger than0.16 ac34% of homes23% of homes28% of homes
Year builtnewer than196027% of homes26% of homes15% of homes

About 521 Osage St

How much is 521 Osage St, Spring Valley, CA worth?

The TopHap Estimate for 521 Osage St, Spring Valley, CA is $670,534 as of Aug 30, 2026. The likely range is $625,630 to $715,438. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 521 Osage St, Spring Valley, CA last sell?

521 Osage St, Spring Valley, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 521 Osage St, Spring Valley, CA?

521 Osage St, Spring Valley, CA has 3 bedrooms, 1.5 bathrooms, 1,048 square feet of living space and a 0.16-acre lot.

When was 521 Osage St, Spring Valley, CA built?

521 Osage St, Spring Valley, CA was built in 1960, making it 66 years old.

What schools serve 521 Osage St, Spring Valley, CA?

521 Osage St, Spring Valley, CA is assigned to Rancho Elementary School (elementary), rated D+; STEAM Academy at La Presa (middle), rated B-; Mount Miguel High School (high), rated C-. All sit in Grossmont Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 Osage St, Spring Valley, CA compare to other homes in Spring Valley 91977?

Among the 15,108 homes in Spring Valley 91977, it is worth more than 49% of them ($670,534 against a typical $671,883), its price per square foot is higher than 96% of them ($640 against a typical $457), it is bigger than 14% of them (1,048 ft² against a typical 1,476 ft²), its lot is bigger than 23% of them (0.16 ac against a typical 0.23 ac) and it is newer than 26% of them (1960 against a typical 1976). Measured against all of San Diego County, it is worth more than 25% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 521 Osage St, Spring Valley, CA?

The 2025 property tax bill for 521 Osage St, Spring Valley, CA was $1,340. The county assessed it at $59,316.

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