Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$646,754$539 / 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 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $237,500 on Apr 28, 2000

521 UNION AVE NE

RENTON, WA 98059
3
Beds
3.3
Baths
1,200 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.
1.02 ac
Lot SizeThe size of the land the home sits on, from county records.
1943
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$647K
$596K low$698K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$237,500 · Apr 28, 2000
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$445,754
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$356,603
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.33%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$201,000
INDYMAC BANK FSB · recorded Jul 20, 2006

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,710 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$528,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$456,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$72,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$512,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$528,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Triplex
CountyKING
HeatingThe type of heating system in the home.Floor/Wall Furnace
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 170 ft²

Transaction History(3)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Foreclosure Filings(2)

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

E
Honey Dew Elementary SchoolC-
Elementary · Grades KG–5 · 0.4 mi
H
Hazen High SchoolB-
High · Grades 9–12 · 1.0 mi
M
Ridson Middle SchoolB+
Middle · Grades 6–8 · 3.6 mi

District: Renton School District

Neighborhood · ZIP 98059These 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.52
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.113
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.270

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.42,159
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,108 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$141,350
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$174,825
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.43%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.No

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 Union Ave Ne 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 83% of homes in Renton 98059
  • Costs more per square foot than 88% of homes in East Renton Highlands
  • Smaller than 89% of homes in Renton 98059
  • Has a bigger lot than 85% of homes in East Renton Highlands
  • Older than 98% of homes in Renton 98059

What homes are worth in Renton 98059

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

This home
$352K$2.5M

This home is worth more than 17% of homes in Renton 98059.

How it measures up in Renton 98059

The dot is this home. The mark in the middle is the typical home in Renton 98059.

Estimated value$646,754
CheaperTypical $914,893Pricier

Pricier than 17% of homes nearby

Price per ft²$539
CheaperTypical $441Pricier

Pricier than 84% of homes nearby

Living area1,200 ft²
SmallerTypical 2,220 ft²Bigger

Bigger than 11% of homes nearby

Lot size1.02 ac
SmallerTypical 0.24 acBigger

Bigger than 85% of homes nearby

Year built1943
OlderTypical 1991Newer

Newer than 2% of homes nearby

How 521 Union Ave Ne ranks against every home in each area.
MeasureThis homeEast Renton HighlandsRenton 98059King County
Estimated valuepricier than$646,75442% of homes17% of homes31% of homes
Price per ft²pricier than$53988% of homes84% of homes58% of homes
Living areabigger than1,200 ft²26% of homes11% of homes21% of homes
Lot sizebigger than1.02 ac85% of homes85% of homes85% of homes
Year builtnewer than194310% of homes2% of homes16% of homes

About 521 Union Ave Ne

How much is 521 Union Ave Ne, Renton, WA worth?

The TopHap Estimate for 521 Union Ave Ne, Renton, WA is $646,754 as of Jul 14, 2026. The likely range is $595,841 to $697,667. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 521 Union Ave Ne, Renton, WA last sell?

521 Union Ave Ne, Renton, WA last sold on Apr 28, 2000 for $237,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 521 Union Ave Ne, Renton, WA?

521 Union Ave Ne, Renton, WA has 3 bedrooms, 3.3 bathrooms and 1,200 square feet of living space.

When was 521 Union Ave Ne, Renton, WA built?

521 Union Ave Ne, Renton, WA was built in 1943, making it 83 years old. It is a triplex home. The building has 1 story.

What schools serve 521 Union Ave Ne, Renton, WA?

521 Union Ave Ne, Renton, WA is assigned to Honey Dew Elementary School (elementary), rated C-; Hazen High School (high), rated B-; Ridson Middle School (middle), rated B+. All sit in Renton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 Union Ave Ne, Renton, WA compare to other homes in Renton 98059?

Among the 12,456 homes in Renton 98059, it is worth more than 17% of them ($646,754 against a typical $914,893), its price per square foot is higher than 84% of them ($539 against a typical $441), it is bigger than 11% of them (1,200 ft² against a typical 2,220 ft²), its lot is bigger than 85% of them (1.02 ac against a typical 0.24 ac) and it is newer than 2% of them (1943 against a typical 1991). Measured against all of King County, it is worth more than 31% 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 Union Ave Ne, Renton, WA?

The 2026 property tax bill for 521 Union Ave Ne, Renton, WA was $5,710. The county assessed it at $528,000.

Closest homes

More homes in Renton 98059

Assigned schools

Explore the area

See this home in context

Open 521 Union Ave Ne on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map