Apartment buildings in Altadena
By Shaya Lowenstein, Senior Associate at Lyon Stahl Investment Real Estate, CA DRE #01942326. From the 2025 LA County assessor roll, transfers through January 17, 2025.
Altadena has 641 parcels with two or more units, 2,101 units in all, on the 2025 Los Angeles County assessor roll. Half of them were built in 1930 or earlier, and 620, or 97%, in 1978 or earlier. 186 parcels, 29%, have not been reassessed on a sale since 1995 or earlier, and 65 last changed hands in 2024.
- Parcels with 2 or more units
- 641
- Units in those parcels
- 2,101
- Median year built
- 1930
- Built in 1978 or earlier
- 620
- Median Prop 13 base year
- 2005
- Base year 1995 or earlier
- 186
- Last transfer in 2024
- 65
What the buildings in Altadena look like.
Most of the apartment stock in Altadena is small. 576 of the 641 parcels hold two to four units, the duplexes, triplexes and fourplexes that are often bought by owner users and first-time investors.
The average parcel here holds 3.3 units. 2 parcels hold 50 units or more. The largest ones are listed further down this page, each with its own public record.
| Size | Parcels | Share |
|---|---|---|
| Two to four units | 576 | 90% |
| Five to nine units | 44 | 7% |
| 10 to 19 units | 14 | 2% |
| 20 to 49 units | 5 | 1% |
| 50 units or more | 2 | 0% |
How old they are.
Half the apartment parcels in Altadena were built in 1930 or earlier. 620 of 641, about 97%, went up in 1978 or before.
Across the 255 ZIP codes on this site that share is 89%, so Altadena has a larger share of older buildings than the average. Older buildings tend to carry the questions a buyer will ask about, like plumbing, electrical, the roof and whether the building needs a seismic retrofit.
Rent control in Altadena.
The City of Los Angeles rent ordinance does not cover Altadena. 620 of the parcels here were built in 1978 or earlier, and age is usually the first thing a local rent rule looks at.
Where a city has no rent rule of its own, the state cap in AB 1482 covers most buildings more than 15 years old. Check with Altadena before you underwrite a rent roll, because local rules change.
How long owners hold.
The median Prop 13 base year for apartment parcels in Altadena is 2005. A base year resets when a building sells, so an old one usually means the same owner or the same family has held it a long time.
186 parcels, 29%, still carry a base year of 1995 or earlier. The figure for all 255 ZIP codes here is 28%, so owners in Altadena have held about as long as the average.
Long-held buildings often pay property tax on a value set decades ago. When they sell, the new owner is taxed on the price, which is part of why rents and expenses on these buildings need a close look before anyone sets a price.
How often buildings sell.
By last recorded transfer, 48 apartment parcels in Altadena changed hands in 2022, 37 in 2023 and 65 in 2024.
That is 10.1% of the parcels here, against 7.3% across all 255 ZIP codes, so buildings here turned over more often than the average.
A building that sold twice in those years shows up once, in its later year, and a transfer is not always a sale at market. A move into a trust or between family members is recorded too.
| Year | Parcels |
|---|---|
| 2022 | 48 |
| 2023 | 37 |
| 2024 | 65 |
The largest apartment buildings in Altadena.
- 2439 Lincoln Ave, Altadena 9100171 units, built 2023
- 2445 Lincoln Ave, Altadena 9100171 units, built 2023
- 403 Figueroa Dr, Altadena 9100147 units, built 1966
- 937 E Mariposa St, Altadena 9100135 units, built 1922
- 699 E Altadena Dr, Altadena 9100126 units, built 1987
- 3012 Lincoln Ave, Altadena 9100124 units, built 1946
- 2107 Raymond Ave, Altadena 9100120 units, built 1926
- 755 E Pine St, Altadena 9100117 units, built 1958
- 2191 El Sereno Ave, Altadena 9100116 units, built 1923
- 2624 Lake Ave, Altadena 9100116 units, built 1946
- 716 E Pine St, Altadena 9100116 units, built 1964
See every apartment building in Altadena with units, square footage, year built and assessed value for each one.
Questions owners ask about Altadena.
How many apartment buildings are in Altadena?
The 2025 Los Angeles County assessor roll lists 641 parcels with two or more units in Altadena, with 2,101 units between them. 576 hold two to four units and 65 hold five or more.
How old are the apartment buildings in Altadena?
The median build year is 1930. 620 of the 641 parcels, about 97%, were built in 1978 or earlier.
Are apartments in Altadena under rent control?
The City of Los Angeles rent ordinance does not cover Altadena. 620 of the parcels here were built in 1978 or earlier, and age is usually the first thing a local rent rule looks at. Where a city has no rent rule of its own, the state cap in AB 1482 covers most buildings more than 15 years old. Check with Altadena before you underwrite a rent roll, because local rules change.
How often do apartment buildings sell in Altadena?
48 parcels show a last recorded transfer in 2022, 37 in 2023 and 65 in 2024. A building that sold twice counts once, in its later year.
How long do owners hold apartment buildings in Altadena?
The median Prop 13 base year is 2005, and 186 parcels, 29%, have a base year of 1995 or earlier. That usually means the same owner or family for 30 years or more.
What is my apartment building in Altadena worth?
It depends on the rents, the expenses, the condition and which rent rules apply, so a number from a website is a guess. Send me the address and I will give you a value based on recent sales nearby and what your building actually earns. There is no charge.
Type your address. You get the county record for it right here, and I will send you a value based on recent sales nearby if you want one.
Thinking about selling? Read how I sell apartment buildings in Los Angeles or ask for a free valuation.
/// ZIP CODES IN ALTADENA
Where these numbers come from.
- Every count is from the 2025 Los Angeles County assessor roll and counts parcels the assessor lists with two or more units. A parcel can hold more than one building.
- The sale years are the most recent recorded transfer on each parcel, through January 17, 2025. A transfer into a trust or between family members is recorded the same way as a sale.
- The base year is the year Prop 13 last set the parcel's land value, which happens when it changes hands. Values set before 1975 show as 1975.
- Rent control and soft-story figures cover the City of Los Angeles only and come from the city's zoning map and permit data. Rent control is worked out from the build year, not taken from the Housing Department's list.
- The numbers were taken from the roll on October 27, 2026. Download every area as a CSV file.
/// HOW TO CITE THIS
Shaya Lowenstein, "Apartment buildings in Altadena," Shaya Lowenstein, October 27, 2026, https://www.shayarealestate.com/apartment-buildings/altadena. Figures from the 2025 Los Angeles County assessor roll.
Shaya Lowenstein, CA DRE #01942326, Lyon Stahl Investment Real Estate. Public record figures, offered as research and not as an appraisal of any one building.