CondominiumResidential
20 Madison Ave
SAN MATEO, CA 94402
0.43 ac
Lot SizeThe size of the land the home sits on, from county records.
2007
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.
Built 20073 floors40 units794–1,684 ft²
$38M
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.
$954K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$826
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.
-40.2%vs the San Mateo ZIP median sale $/ft² ($1381)
Sales Performance
—
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
—
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
0
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
0.0%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+3.6%per yeartypical hold 5.4 yrsfrom 29 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
20042008201020122017202020222024
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
20042008201020122017202020222024
69 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.
1 bd2 bd3 bd
1 bed
5 units$706K · $860/ft²
2 bed
34 units$986K · $826/ft²
3 bed
1 unit$1.2M · $759/ft²
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 · 821 ft²
3 units$706K · $860/ft²
2 bd · 2 ba · 1,054 ft²
3 units$848K · $805/ft²
2 bd · 2 ba · 1,141 ft²
3 units$913K · $800/ft²
2 bd · 2 ba · 1,216 ft²
3 units$954K · $785/ft²
2 bd · 2 ba · 1,239 ft²
3 units$1M · $826/ft²
2 bd · 2 ba · 1,255 ft²
3 units$1M · $831/ft²
2 bd · 2 ba · 1,332 ft²
3 units$1.1M · $826/ft²
1 bd · 1 ba · 794 ft²
2 units$650K · $819/ft²
2 bd · 2 ba · 1,090 ft²
2 units$893K · $819/ft²
2 bd · 2 ba · 1,117 ft²
2 units$1.1M · $977/ft²
2 bd · 2 ba · 1,126 ft²
2 units$984K · $874/ft²
One-off layouts
11 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.
$553K–$553K
1 unit
$689K–$748K
3 units
$790K–$883K
7 units
$904K–$1M
13 units
$1M–$1.1M
10 units
$1.1M–$1.2M
2 units
$1.3M–$1.4M
2 units
$1.5M–$1.5M
1 unit
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
$803/ft²13 units · -3%
Floor 2
$890/ft²13 units · +8%
Floor 3
$831/ft²13 units · +1%
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 ·04
$923/ft²3 units · +12%
Line ·03
$864/ft²3 units · +5%
Line ·01
$838/ft²3 units · +1%
Line ·10
$836/ft²3 units · +1%
Line ·08
$828/ft²3 units · +0%
Line ·13
$828/ft²3 units · +0%
Line ·02
$826/ft²3 units · +0%
Line ·05
$824/ft²3 units · +0%
Line ·12
$818/ft²3 units · -1%
Line ·07
$807/ft²3 units · -2%
Line ·06
$794/ft²3 units · -4%
Ownership & Financing
Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.63%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.20%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.17.2 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.0%
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.46%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$954,644
Median tax billThe middle annual property tax bill among the building's units.$10,614
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 101May 14, 2024$461,000$581/ft²Unit 204Mar 8, 2023$795,000$968/ft²Unit 304Jun 29, 2022$810,000$987/ft²Unit 314Mar 7, 2022$1,122,000$1029/ft²Unit 106Jan 5, 2022$1,130,000$912/ft²Unit 210Jun 24, 2021$1,350,000$844/ft²Unit 309Jun 8, 2021$1,175,000$936/ft²Unit 201May 24, 2021$775,000$976/ft²Unit 111May 10, 2021$1,165,000$1043/ft²Unit 205Sep 22, 2020$431,000$409/ft²
Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.
Climate Risk
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.11 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal
Scores 0–100; higher = greater projected risk.
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
CountySAN MATEO
Lot (acres)The size of the land the home sits on, from county records.0.43
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.None
FireplaceWhether the home has a fireplace, and what kind.Yes
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.
MHE
Borel Middle SchoolA-
Middle · Grades 6–8 · 0.4 mi
Aragon High SchoolA+
High · Grades 9–12 · 0.7 mi
Baywood Elementary SchoolA-
Elementary · Grades KG–5 · 0.8 mi
District: San Mateo-Foster City Elementary School District
Neighborhood · ZIP 94402These 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.91
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.595
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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.4%
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.26,204
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,919 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$171,813
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$232,257
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.24 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.66%
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.
20 Madison Ave # 101
1 bd · 1 ba · 794 ft²
20 Madison Ave # 102
2 bd · 2 ba · 1,216 ft²
20 Madison Ave # 103
2 bd · 2 ba · 1,126 ft²
20 Madison Ave # 104
1 bd · 1 ba · 821 ft²
20 Madison Ave # 105
2 bd · 2 ba · 1,054 ft²
20 Madison Ave # 106
2 bd · 2 ba · 1,239 ft²
20 Madison Ave # 107
2 bd · 2 ba · 1,141 ft²
20 Madison Ave # 108
2 bd · 2 ba · 1,332 ft²
20 Madison Ave # 109
2 bd · 2 ba · 1,255 ft²
20 Madison Ave # 110
2 bd · 2 ba · 1,400 ft²
20 Madison Ave # 111
2 bd · 2 ba · 1,117 ft²
20 Madison Ave # 112
2 bd · 2 ba · 957 ft²
20 Madison Ave # 113
3 bd · 2 ba · 1,560 ft²
20 Madison Ave # 201
1 bd · 1 ba · 794 ft²
20 Madison Ave # 202
2 bd · 2 ba · 1,216 ft²
20 Madison Ave # 203
2 bd · 2 ba · 1,126 ft²
20 Madison Ave # 204
1 bd · 1 ba · 821 ft²
20 Madison Ave # 205
2 bd · 2 ba · 1,054 ft²
20 Madison Ave # 206
2 bd · 2 ba · 1,239 ft²
20 Madison Ave # 207
2 bd · 2 ba · 1,141 ft²
20 Madison Ave # 208
2 bd · 2 ba · 1,332 ft²
20 Madison Ave # 209
2 bd · 2 ba · 1,255 ft²
20 Madison Ave # 210
2 bd · 2 ba · 1,600 ft²
20 Madison Ave # 211
2 bd · 2 ba · 1,117 ft²
20 Madison Ave # 212
2 bd · 2 ba · 1,136 ft²
20 Madison Ave # 213
2 bd · 2 ba · 1,378 ft²
20 Madison Ave # 214
2 bd · 2 ba · 1,090 ft²
20 Madison Ave # 301
2 bd · 2 ba · 1,052 ft²
20 Madison Ave # 302
2 bd · 2 ba · 1,216 ft²
20 Madison Ave # 303
2 bd · 2 ba · 1,171 ft²
20 Madison Ave # 304
1 bd · 1 ba · 821 ft²
20 Madison Ave # 305
2 bd · 2 ba · 1,054 ft²
20 Madison Ave # 306
2 bd · 2 ba · 1,239 ft²
20 Madison Ave # 307
2 bd · 2 ba · 1,141 ft²
20 Madison Ave # 308
2 bd · 2 ba · 1,332 ft²
20 Madison Ave # 309
2 bd · 2 ba · 1,255 ft²
20 Madison Ave # 310
2 bd · 2 ba · 1,684 ft²
20 Madison Ave # 312
2 bd · 2 ba · 1,157 ft²
20 Madison Ave # 313
2 bd · 2 ba · 1,247 ft²
20 Madison Ave # 314
2 bd · 2 ba · 1,090 ft²
Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
About 20 Madison Ave
How many units are in 20 Madison Ave, San Mateo, CA?
20 Madison Ave, San Mateo, CA has 40 residential units across 3 floors, built in 2007, according to county assessor records.
What is a unit at 20 Madison Ave, San Mateo, CA worth?
The median TopHap Estimate across the 40 units at 20 Madison Ave, San Mateo, CA is $954,339. That works out to $826 per square foot. Units run from 794 to 1,684 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.
Is 20 Madison Ave, San Mateo, CA expensive for San Mateo?
Units at 20 Madison Ave, San Mateo, CA carry a median of $826 per square foot, 40% below the San Mateo median of $1381 per square foot.
How often do units sell at 20 Madison Ave, San Mateo, CA?
0 units at 20 Madison Ave, San Mateo, CA sold in the last 12 months, out of 69 recorded arms-length sales all time. That is a turnover rate of 0.0% of the building per year.
Have units at 20 Madison Ave, San Mateo, CA appreciated?
Across 29 repeat sales of the same unit, 20 Madison Ave, San Mateo, CA returned a median 3.6% 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 5.4 years.
What floor plans does 20 Madison Ave, San Mateo, CA have?
The most common plan at 20 Madison Ave, San Mateo, CA is a 1-bedroom of 821 square feet, repeated 3 times, with a median estimate of $705,926. TopHap identifies 11 recurring plans in the building.
More homes on Madison Ave
- 33 Madison Ave5 bd · 2 ba · 2,924 ft² · Sold $2.1M · Feb 2025
- 20 Madison Ave # 101$553K1 bd · 1 ba · 794 ft² · Sold $461K · May 2024
- 112 Madison Ave # 206$921K2 bd · 2 ba · 1,200 ft² · Sold $901K · Jun 2023
- 20 Madison Ave # 204$879K1 bd · 1 ba · 821 ft² · Sold $795K · Mar 2023
- 20 Madison Ave # 304$689K1 bd · 1 ba · 821 ft² · Sold $810K · Jun 2022
- 20 Madison Ave # 314$927K2 bd · 2 ba · 1,090 ft² · Sold $1.1M · Mar 2022
- 20 Madison Ave # 106$1M2 bd · 2 ba · 1,239 ft² · Sold $1.1M · Jan 2022
- 20 Madison Ave # 210$1.5M2 bd · 2 ba · 1,600 ft² · Sold $1.4M · Jun 2021
- 20 Madison Ave # 309$1.1M2 bd · 2 ba · 1,255 ft² · Sold $1.2M · Jun 2021
- 20 Madison Ave # 201$748K1 bd · 1 ba · 794 ft² · Sold $775K · May 2021
- 20 Madison Ave # 111$1.1M2 bd · 2 ba · 1,117 ft² · Sold $1.2M · May 2021
- 112 Madison Ave # 208$1M2 bd · 2 ba · 1,200 ft² · Sold $950K · Nov 2020
Closest homes
- 20 Madison Ave$1M0 ft · 2 bd · 2 ba · 1,239 ft² · Sold $1.1M · Jan 2022
- 20 Madison Ave$904K0 ft · 2 bd · 2 ba · 1,239 ft² · Sold $629K · Dec 2008
- 20 Madison Ave$848K31 ft · 2 bd · 2 ba · 1,054 ft² · Sold $431K · Sep 2020
- 20 Madison Ave$835K31 ft · 2 bd · 2 ba · 1,054 ft² · Sold $306K · Mar 2012
- 20 Madison Ave$923K31 ft · 2 bd · 2 ba · 1,054 ft² · Sold $649K · Jan 2008
- 20 Madison Ave$883K37 ft · 2 bd · 2 ba · 1,141 ft² · Sold $292K · Nov 2009
- 20 Madison Ave$967K37 ft · 2 bd · 2 ba · 1,141 ft² · Sold $286K · Aug 2007
- 20 Madison Ave$913K37 ft · 2 bd · 2 ba · 1,141 ft² · Sold $598K · Jul 2008
More homes in San Mateo 94402
- 962 S El Camino Real$742K3 bd · 2 ba · 1,220 ft² · Sold $770K · Sep 2026
- 25 Ericson Rd$3M3 bd · 2.5 ba · 2,060 ft² · Sold $3.9M · Sep 2026
- 122 Castilian Way$3.9M4 bd · 3.5 ba · 2,250 ft² · Sold $3.9M · Sep 2026
- 40 Powhatan Pl$3.2M4 bd · 2 ba · 2,160 ft² · Sold $3.2M · Sep 2026
- 731 W Capistrano Way$3.5M4 bd · 3 ba · 2,390 ft² · Sold $3.5M · Sep 2026
- 404 Hillsborough Blvd$4.1M3 bd · 2.5 ba · 2,950 ft² · Sold $4.1M · Sep 2026
- 29 Weepingridge Ct$1.7M3 bd · 2.5 ba · 1,920 ft² · Sold $1.5M · Sep 2026
- 37 Weepingridge Ct$1.6M3 bd · 2.5 ba · 1,920 ft² · Sold $1.6M · Sep 2026
- 2012 Timberlane Way$2.7M4 bd · 4.5 ba · 3,820 ft² · Sold $2.8M · Sep 2026
- 222 Harvard Rd$4.2M4 bd · 2.5 ba · 2,930 ft² · Sold $4.2M · Sep 2026
- 1708 Monticello Rd$2.5M3 bd · 2 ba · 1,540 ft² · Sold $2.5M · Sep 2026
- 21 Southridge Ct$1.5M3 bd · 2.5 ba · 1,600 ft² · Sold $1.5M · Sep 2026
Assigned schools
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