Apartment buildings in 91773, San Dimas
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 91773 in San Dimas has 195 parcels with two or more units, 2,021 units in all, on the 2025 Los Angeles County assessor roll. Half of them were built in 1959 or earlier, and 127, or 65%, in 1978 or earlier. 52 parcels, 27%, have not been reassessed on a sale since 1995 or earlier, and 6 last changed hands in 2024.
- Parcels with 2 or more units
- 195
- Units in those parcels
- 2,021
- Median year built
- 1959
- Built in 1978 or earlier
- 127
- Median Prop 13 base year
- 2007
- Base year 1995 or earlier
- 52
- Last transfer in 2024
- 6
What the buildings in 91773 San Dimas look like.
Most of the apartment stock in 91773 San Dimas is small. 167 of the 195 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 10.4 units. 12 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 | 167 | 86% |
| Five to nine units | 8 | 4% |
| 10 to 19 units | 2 | 1% |
| 20 to 49 units | 6 | 3% |
| 50 units or more | 12 | 6% |
How old they are.
Half the apartment parcels in 91773 San Dimas were built in 1959 or earlier. 127 of 195, about 65%, went up in 1978 or before.
Across the 255 ZIP codes on this site that share is 89%, so 91773 San Dimas 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 91773 San Dimas.
The City of Los Angeles rent ordinance does not cover 91773 San Dimas. 127 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 San Dimas before you underwrite a rent roll, because local rules change.
How long owners hold.
The median Prop 13 base year for apartment parcels in 91773 San Dimas is 2007. 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.
52 parcels, 27%, still carry a base year of 1995 or earlier. The figure for all 255 ZIP codes here is 28%, so owners in 91773 San Dimas 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, 9 apartment parcels in 91773 San Dimas changed hands in 2022, 20 in 2023 and 6 in 2024.
That is 3.1% 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 | 9 |
| 2023 | 20 |
| 2024 | 6 |
The largest apartment buildings in 91773 San Dimas.
- 444 N Amelia Ave, San Dimas 91773224 units, built 1977
- 650 E Bonita Ave, San Dimas 91773168 units, built 1978
- 251 S Walnut Ave, San Dimas 91773164 units, built 1984
- 325 S San Dimas Canyon Rd, San Dimas 91773156 units, built 1981
- 265 W Foothill Blvd, San Dimas 91773137 units, built 1989
- 301 N San Dimas Canyon Rd, San Dimas 91773101 units, built 1973
- 553 E Bonita Ave, San Dimas 9177392 units, built 1970
- 203 N San Dimas Canyon Rd, A, San Dimas 9177372 units, built 2014
- 653 E Juanita Ave, San Dimas 9177365 units, built 1971
- 445 N Amelia Ave, San Dimas 9177364 units, built 1978
- 110 E Baseline Rd, San Dimas 9177352 units, built 1979
- 249 S Acacia St, San Dimas 9177350 units, built 1980
See every apartment building in 91773 San Dimas with units, square footage, year built and assessed value for each one.
Questions owners ask about 91773 San Dimas.
How many apartment buildings are in 91773 San Dimas?
The 2025 Los Angeles County assessor roll lists 195 parcels with two or more units in ZIP code 91773 in San Dimas, with 2,021 units between them. 167 hold two to four units and 28 hold five or more.
How old are the apartment buildings in 91773 San Dimas?
The median build year is 1959. 127 of the 195 parcels, about 65%, were built in 1978 or earlier.
Are apartments in 91773 San Dimas under rent control?
The City of Los Angeles rent ordinance does not cover 91773 San Dimas. 127 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 San Dimas before you underwrite a rent roll, because local rules change.
How often do apartment buildings sell in 91773 San Dimas?
9 parcels show a last recorded transfer in 2022, 20 in 2023 and 6 in 2024. A building that sold twice counts once, in its later year.
How long do owners hold apartment buildings in 91773 San Dimas?
The median Prop 13 base year is 2007, and 52 parcels, 27%, 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 91773 San Dimas 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 91773, San Dimas," Shaya Lowenstein, October 27, 2026, https://www.shayarealestate.com/apartment-buildings/91773. 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.