Apartment buildings in 91384, Castaic
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.
ZIP code 91384 in Castaic has 41 parcels with two or more units, 514 units in all, on the 2025 Los Angeles County assessor roll. Half of them were built in 1979 or earlier, and 19, or 46%, in 1978 or earlier. 12 parcels, 29%, have not been reassessed on a sale since 1995 or earlier, and 1 last changed hands in 2024.
- Parcels with 2 or more units
- 41
- Units in those parcels
- 514
- Median year built
- 1979
- Built in 1978 or earlier
- 19
- Median Prop 13 base year
- 2002
- Base year 1995 or earlier
- 12
- Last transfer in 2024
- 1
What the buildings in 91384 Castaic look like.
Most of the apartment stock in 91384 Castaic is small. 24 of the 41 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 12.5 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 | 24 | 59% |
| Five to nine units | 4 | 10% |
| 10 to 19 units | 8 | 20% |
| 20 to 49 units | 3 | 7% |
| 50 units or more | 2 | 5% |
How old they are.
Half the apartment parcels in 91384 Castaic were built in 1979 or earlier. 19 of 41, about 46%, went up in 1978 or before.
Across the 255 ZIP codes on this site that share is 89%, so 91384 Castaic has a smaller 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 91384 Castaic.
The City of Los Angeles rent ordinance does not cover 91384 Castaic. 19 of the parcels here were built in 1978 or earlier, and age is usually the first thing a local rent rule looks at.
Most of the parcels in this ZIP with a known jurisdiction are in unincorporated Los Angeles County, and the County runs its own rent stabilization ordinance for many older buildings there.
How long owners hold.
The median Prop 13 base year for apartment parcels in 91384 Castaic is 2002. 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.
12 parcels, 29%, still carry a base year of 1995 or earlier. The figure for all 255 ZIP codes here is 28%, so owners in 91384 Castaic 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, 4 apartment parcels in 91384 Castaic changed hands in 2022, 3 in 2023 and 1 in 2024.
That is 2.4% of the parcels here, against 7.3% across all 255 ZIP codes, so buildings here turned over less 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 | 4 |
| 2023 | 3 |
| 2024 | 1 |
The largest apartment buildings in 91384 Castaic.
- 31990 Castaic Rd, Castaic 91384150 units, built 2004
- 31657 Ridge Route Rd, Castaic 9138484 units, built 1991
- 31737 Ridge Route Rd, Castaic 9138446 units, built 1984
- 31717 Ridge Route Rd, Castaic 9138430 units, built 1979
- 27614 Violin Canyon Rd, Castaic 9138422 units, built 1981
- 31701 Ridge Route Rd, Castaic 9138419 units, built 1963
- 31701 Ridge Route Rd, Castaic 9138414 units, built 1988
- 27544 Violin Canyon Rd, Castaic 9138413 units, built 1979
- 27500 Violin Canyon Rd, Castaic 9138412 units, built 1985
- 27538 Violin Canyon Rd, Castaic 9138412 units, built 1989
- 27504 Violin Canyon Rd, Castaic 9138410 units, built 1986
- 27516 Violin Canyon Rd, Castaic 9138410 units, built 1985
See every apartment building in 91384 Castaic with units, square footage, year built and assessed value for each one.
Questions owners ask about 91384 Castaic.
How many apartment buildings are in 91384 Castaic?
The 2025 Los Angeles County assessor roll lists 41 parcels with two or more units in ZIP code 91384 in Castaic, with 514 units between them. 24 hold two to four units and 17 hold five or more.
How old are the apartment buildings in 91384 Castaic?
The median build year is 1979. 19 of the 41 parcels, about 46%, were built in 1978 or earlier.
Are apartments in 91384 Castaic under rent control?
The City of Los Angeles rent ordinance does not cover 91384 Castaic. 19 of the parcels here were built in 1978 or earlier, and age is usually the first thing a local rent rule looks at. Most of the parcels in this ZIP with a known jurisdiction are in unincorporated Los Angeles County, and the County runs its own rent stabilization ordinance for many older buildings there.
How often do apartment buildings sell in 91384 Castaic?
4 parcels show a last recorded transfer in 2022, 3 in 2023 and 1 in 2024. A building that sold twice counts once, in its later year.
How long do owners hold apartment buildings in 91384 Castaic?
The median Prop 13 base year is 2002, and 12 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 91384 Castaic 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.
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 91384, Castaic," Shaya Lowenstein, October 27, 2026, https://www.shayarealestate.com/apartment-buildings/91384. 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.