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CondominiumResidential

830 20th St

BOULDER, CO 80302
24 ft²
Lot SizeThe size of the land the home sits on, from county records.
1963
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
Built 19633 floors36 units589–868 ft²
$15M
All units combinedThe sum of our current value estimates for every unit in the building — roughly what the whole building's homes are worth together.
$408K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$553
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.

-3.7%vs the Boulder ZIP median sale $/ft² ($574)

Sales Performance

$359K
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
-25.2%
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
3
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
8.3%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+3.4%per yeartypical hold 4.6 yrsfrom 23 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
20022005200720122015202120232026
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
20022005200720122015202120232026

54 arms-length sales on record for this building.

Unit Mix & Floor PlansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.

Every unit: size vs estimated valueEvery unit in the building as one dot: across is its size, up is our current value estimate, and color is its bedroom count. Vertical columns of dots are recurring floor plans; the height spread within a column shows how much floor, view and condition move prices for the same layout.
$265K$343K$421K$499K589 ft²645 ft²701 ft²756 ft²812 ft²868 ft²
1 bd2 bd
1 bed
20 units
2 bed
16 units
Recurring floor plansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.
1 bd · 1 ba · 620 ft²
15 units
2 bd · 1 ba · 868 ft²
15 units
1 bd · 1 ba · 665 ft²
2 units
1 bd · 1 ba · 713 ft²
2 units
One-off layouts
2 units

Value DistributionHow the building's units spread across value ranges by our current estimates. A wide spread usually means big differences in size, floor or view.

$265K–$265K
1 unit
$310K–$310K
1 unit
$336K–$346K
3 units
$360K–$381K
8 units
$382K–$409K
7 units
$413K–$440K
7 units
$456K–$463K
5 units
$472K–$499K
4 units

Value by Floor & LineAverage estimated price per square foot by floor range, using unit numbers to infer floors. Higher floors usually price higher — the gap shows how much the view is worth here.

Floor 1
$556/ft²
Floor 2
$558/ft²
Floor 3
$565/ft²
Unit lines by $/ft²Condo units stacked vertically share a unit line — the last digits of the unit number (like 05 in 1205, 1305, 1405). Lines share a layout and exposure, so comparing estimated $/ft² by line shows which position in the building commands a premium.
Line ·08
$661/ft²
Line ·09
$607/ft²
Line ·10
$583/ft²
Line ·07
$578/ft²
Line ·05
$566/ft²
Line ·03
$562/ft²
Line ·04
$560/ft²
Line ·02
$530/ft²
Line ·11
$528/ft²
Line ·06
$528/ft²
Line ·12
$518/ft²
Line ·01
$499/ft²

Ownership & Financing

Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.3%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.25%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.5.5 yrs
Cash purchases (5 yrs)The share of purchases in the last 5 years with no mortgage recorded. High cash share is common in second-home and investor buildings.40%
Avg. loan-to-valueAverage current loan balance against unit value across the building. Low numbers mean owners hold lots of equity — a sign of financial stability.30%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$377,958
Median tax billThe middle annual property tax bill among the building's units.$2,377
Pre-foreclosure noticesUnits with an active pre-foreclosure or foreclosure notice on file.0

Recent SalesThe latest recorded arms-length sales in the building, newest first.

Unit 303Aug 24, 2026$359,000Unit 210Apr 6, 2026$365,000Unit 203Nov 25, 2025$305,000Unit 306Nov 27, 2024$480,000Unit 101Jun 3, 2024$434,500Unit 211May 6, 2024$448,000Unit 102Nov 20, 2023$475,000Unit 307Sep 25, 2023$355,000Unit 105Jul 27, 2023$341,000Unit 308Jul 17, 2023$369,000

Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyBOULDER
Lot (acres)The size of the land the home sits on, from county records.0.00
ConstructionThe main material the home's frame and walls are built from.Masonry/Concrete Masonry Units (Cmus)
RoofThe main material covering the roof, such as asphalt shingle or tile.Builtup (layered Asphalt)
HeatingThe type of heating system in the home.Hot Water
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.

H
Boulder High SchoolC
High · Grades 9–12 · 0.8 mi
E
Flatirons Elementary SchoolA
Elementary · Grades KG–5 · 1.0 mi
M
Manhattan School of Arts and AcademicsA-
Middle · Grades 6–8 · 2.1 mi

District: Boulder Valley School District Re-2

Neighborhood · ZIP 80302These 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.134
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.46

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.37%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.27%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.31,245
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.324 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$82,366
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$127,191
Average tempThe average temperature here across a full year.45°F
Annual precipHow much rain and melted snow falls here in a typical year.22 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

All UnitsEvery property record the county has at this street address, such as the units in a condo building. Prices shown are our estimates, not asking prices.

830 20th St # 101
2 bd · 1 ba · 868 ft²
$456K
830 20th St # 102
2 bd · 1 ba · 868 ft²
$495K
830 20th St # 103
1 bd · 1 ba · 620 ft²
$375K
830 20th St # 104
1 bd · 1 ba · 620 ft²
$265K
830 20th St # 105
1 bd · 1 ba · 665 ft²
$346K
830 20th St # 106
2 bd · 1 ba · 868 ft²
$462K
830 20th St # 107
1 bd · 1 ba · 713 ft²
$409K
830 20th St # 108
1 bd · 1 ba · 589 ft²
$381K
830 20th St # 109
1 bd · 1 ba · 620 ft²
$409K
830 20th St # 110
1 bd · 1 ba · 620 ft²
$343K
830 20th St # 111
2 bd · 1 ba · 868 ft²
$440K
830 20th St # 112
2 bd · 1 ba · 868 ft²
$481K
830 20th St # 201
2 bd · 1 ba · 868 ft²
$426K
830 20th St # 202
2 bd · 1 ba · 868 ft²
$460K
830 20th St # 203
1 bd · 1 ba · 620 ft²
$310K
830 20th St # 204
1 bd · 1 ba · 620 ft²
$370K
830 20th St # 205
1 bd · 1 ba · 665 ft²
$367K
830 20th St # 206
2 bd · 1 ba · 868 ft²
$413K
830 20th St # 207
1 bd · 1 ba · 713 ft²
$388K
830 20th St # 208
2 bd · 1 ba · 589 ft²
$435K
830 20th St # 209
1 bd · 1 ba · 620 ft²
$385K
830 20th St # 210
1 bd · 1 ba · 620 ft²
$368K
830 20th St # 211
2 bd · 1 ba · 868 ft²
$463K
830 20th St # 212
2 bd · 1 ba · 868 ft²
$456K
830 20th St # 301
2 bd · 1 ba · 868 ft²
$418K
830 20th St # 302
2 bd · 1 ba · 868 ft²
$425K
830 20th St # 303
1 bd · 1 ba · 620 ft²
$360K
830 20th St # 304
1 bd · 1 ba · 620 ft²
$407K
830 20th St # 305
1 bd · 1 ba · 620 ft²
$387K
830 20th St # 306
2 bd · 1 ba · 868 ft²
$499K
830 20th St # 307
1 bd · 1 ba · 620 ft²
$382K
830 20th St # 308
1 bd · 1 ba · 620 ft²
$370K
830 20th St # 309
1 bd · 1 ba · 620 ft²
$336K
830 20th St # 310
1 bd · 1 ba · 620 ft²
$373K
830 20th St # 311
2 bd · 1 ba · 868 ft²
$472K
830 20th St # 312
2 bd · 1 ba · 868 ft²
$413K

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

About 830 20th St

How many units are in 830 20th St, Boulder, CO?

830 20th St, Boulder, CO has 36 residential units across 3 floors, built in 1963, according to county assessor records.

What is a unit at 830 20th St, Boulder, CO worth?

The median TopHap Estimate across the 36 units at 830 20th St, Boulder, CO is $407,787. That works out to $553 per square foot. Units run from 589 to 868 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.

Is 830 20th St, Boulder, CO expensive for Boulder?

Units at 830 20th St, Boulder, CO carry a median of $553 per square foot, 4% below the Boulder median of $574 per square foot.

How often do units sell at 830 20th St, Boulder, CO?

3 units at 830 20th St, Boulder, CO sold in the last 12 months, out of 54 recorded arms-length sales all time. That is a turnover rate of 8.3% of the building per year. The median sale over that period was $359K.

Have units at 830 20th St, Boulder, CO appreciated?

Across 23 repeat sales of the same unit, 830 20th St, Boulder, CO returned a median 3.4% per year. Because each pair is the same unit bought and sold, the figure is not distorted by which units traded. The median owner held for 4.6 years.

What floor plans does 830 20th St, Boulder, CO have?

The most common plan at 830 20th St, Boulder, CO is a 1-bedroom of 620 square feet, repeated 15 times, with a median estimate of $370,397. TopHap identifies 4 recurring plans in the building.

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