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© 2026 SHAYA LOWENSTEIN · LYON STAHL INVESTMENT REAL ESTATE830 S PACIFIC COAST HWY, SUITE D-200, EL SEGUNDO, CA 90245SHAYA@LYONSTAHL.COM · DRE #01942326
BUILDINGS/10243 MOUNTAIR AVE
/// BUILDING FILE · ROLL 2025

10243 MOUNTAIR AVE.

Los Angeles, CA 91042 · APN 2558-024-040

/// WHERE DO WE REACH YOU?

ONE EMAIL, USED TO KEEP THIS LIST AND TO TELL YOU IF A WATCHED BUILDING LISTS OR SELLS. UNSUBSCRIBE ANY TIME.

UNITS

4

BUILDING SF

3,384

SF / UNIT

846

YEAR BUILT

1963

BEDROOMS

8

BATHROOMS

4

USE · CODE 0400

FOURPLEX

/// ASSESSED VALUE
LAND$865,945
IMPROVEMENTS$286,844
TOTAL$1,152,789
LAND BASE YEAR2021
OWNERSHIP TENUREAPPROX. 5 YEARS

PROP 13 ASSESSED VALUES — USUALLY WELL BELOW MARKET ON LONG-HELD BUILDINGS.

/// LAST TRANSFER
RECORDEDJAN 29, 2021
EST. PRICE (2021)$1,064,999
EST. $/UNIT$266,250

PRICE ESTIMATED FROM ASSESSOR REASSESSMENT AT SALE — NOT A VERIFIED CLOSING PRICE.

/// RENT CONTROL

LIKELY COVERED BY LA RSO

Built 1963 in the City of Los Angeles with 4 units — pre-October 1978 multifamily inside city limits is generally under the Rent Stabilization Ordinance, capping annual increases and restricting evictions.

HOW LA RSO WORKS →INFERRED FROM PUBLIC RECORDS — VERIFY WITH LAHD / ZIMAS BEFORE RELYING ON IT.
/// ZIP 91042

Recent sales nearby.

ADDRESSSOLDEST. PRICEEST. $/UNITUNITS
10253 COMMERCE AVE→DEC 2024EST.$418,861$209,430UNITS27064 GREELEY ST→DEC 2024EST.$4,050,000$450,000UNITS910030 PINEWOOD AVE→DEC 2024EST.$1,050,000$350,000UNITS310155 SILVERTON AVE→DEC 2024EST.$2,700,000$192,857UNITS1410207 HELENDALE AVE→NOV 2024EST.$745,000$372,500UNITS27727 APPERSON ST→OCT 2024EST.$740,000$370,000UNITS27137 GREELEY ST→OCT 2024EST.$2,600,000$325,000UNITS87636 DAY ST→OCT 2024EST.$720,000$360,000UNITS2

PRICES ESTIMATED FROM ASSESSOR REASSESSMENT AT SALE (ASSESSED VALUE DEFLATED 2%/YR) — NOT VERIFIED CLOSING PRICES.

/// COMPARE

Buildings like this one.

ON MOUNTAIR AVE · ZIP 91042

10050 MOUNTAIR AVE→39 UNITS · BUILT 1964 · 5+ UNITS10062 MOUNTAIR AVE→3 UNITS · BUILT 1947 · TRIPLEX10063 MOUNTAIR AVE→8 UNITS · BUILT 1987 · 5+ UNITS10069 MOUNTAIR AVE→2 UNITS · BUILT 1948 · DUPLEX10109 MOUNTAIR AVE→4 UNITS · BUILT 1962 · FOURPLEX10118 MOUNTAIR AVE→9 UNITS · BUILT 1947 · 5+ UNITS

SIMILAR SIZE AND ERA IN 91042

10010 PINEWOOD AVE→4 UNITS · BUILT 1949 · 2,515 SF10038 PINEWOOD AVE→4 UNITS · BUILT 1953 · 2,366 SF10054 PINEWOOD AVE→4 UNITS · BUILT 1953 · 2,552 SF10058 PINEWOOD AVE, APT 0001→4 UNITS · BUILT 1953 · 2,552 SF10147 HILLHAVEN AVE→4 UNITS · BUILT 1955 · 2,904 SF10151 FERNGLEN AVE→4 UNITS · BUILT 1965 · 3,000 SF
EVERY BUILDING IN 91042 →RSO, 5–12 UNITS →LAND WORTH MORE THAN THE BUILDING →
/// COMMON QUESTIONS · 10243 MOUNTAIR AVE

The short answers.

Is 10243 Mountair Ave rent controlled?

Built 1963 in the City of Los Angeles with 4 units — pre-October 1978 multifamily inside city limits is generally under the Rent Stabilization Ordinance, capping annual increases and restricting evictions. This is an inference from public assessor records, not a determination — confirm the certificate of occupancy date with the LA Housing Department or ZIMAS before you rely on it for pricing or notices.

How many units does 10243 Mountair Ave have?

County records list 4 units at 10243 Mountair Ave, classified as fourplex across 3,384 square feet of building area, averaging about 846 square feet per unit. Unit counts on the roll can lag permitted conversions and unpermitted additions in both directions.

When was 10243 Mountair Ave built?

The assessor roll gives a build year of 1963, which puts it in the pre-1979 stock that the LA Rent Stabilization Ordinance generally covers inside city limits. Age drives more than character here: it sets rent-cap exposure, seismic retrofit obligations, and what a lender will underwrite.

When did 10243 Mountair Ave last sell, and for how much?

The last recorded transfer was January 2021, at an estimated $1,064,999 — about $266,250 per unit. That price is estimated from the Proposition 13 reassessment recorded at sale, not a verified closing price, so treat it as a close approximation rather than a confirmed figure.

What is 10243 Mountair Ave assessed at, and is that what it is worth?

The current assessed value is $1,152,789 ($865,945 land, $286,844 improvements). Assessed value is not market value. Under Proposition 13 it resets only on a change of ownership and then climbs about 2% a year, so a long-held building is often assessed far below what it would trade for.

How do I find out what 10243 Mountair Ave would sell for today?

Public records give you the frame — units, size, age, assessed value, when it last traded — but pricing needs in-place rents, expenses, and the condition of the units, none of which appear in county data. A broker valuation puts closed comps and a rent survey against the actual rent roll. Shaya Lowenstein does that free for LA multifamily owners, typically within 48 hours, with no obligation to list.

/// OWNER READING
WHAT IS MY BUILDING WORTH? →SELLING WITH TENANTS IN PLACE →HOW LA RSO WORKS →

Own this building?

FREE, CONFIDENTIAL VALUATION FROM CLOSED COMPS — 48H TURNAROUND.

WHAT'S IT WORTH_TALK TO SHAYA →

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