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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/4338 MAMMOTH AVE
/// BUILDING FILE · ROLL 2025

4338 MAMMOTH AVE.

Los Angeles, CA 91423 · APN 2271-018-024

/// 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

9

BUILDING SF

8,664

SF / UNIT

963

YEAR BUILT

1977

BEDROOMS

—

BATHROOMS

—

USE · CODE 0500

5+ UNITS

/// ASSESSED VALUE
LAND$370,647
IMPROVEMENTS$688,361
TOTAL$1,059,008
LAND BASE YEAR1987
OWNERSHIP TENUREAPPROX. 39 YEARS

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

/// LAST TRANSFER
RECORDEDJUL 14, 2008

No market sale detected on this parcel since 2021. The last recorded transfer may have been a refinance, trust move, or family transfer that didn't reset the Prop 13 base.

/// RENT CONTROL

LIKELY COVERED BY LA RSO

Built 1977 in the City of Los Angeles with 9 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 91423

Recent sales nearby.

ADDRESSSOLDEST. PRICEEST. $/UNITUNITS
4450 FULTON AVE→DEC 2024EST.$2,225,000$278,125UNITS84514 FULTON AVE→DEC 2024EST.$2,225,000$278,125UNITS814461 DICKENS ST→NOV 2024EST.$1,200,000$240,000UNITS54447 MATILIJA AVE→NOV 2024EST.$1,590,500$795,250UNITS24556 HAZELTINE AVE→SEP 2024EST.$1,635,000$272,500UNITS64345 MATILIJA AVE→AUG 2024EST.$2,475,000$309,375UNITS84503 FULTON AVE→AUG 2024EST.$2,035,500$254,438UNITS84916 HAZELTINE AVE→AUG 2024EST.$2,400,000$300,000UNITS8

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

/// COMPARE

Buildings like this one.

ON MAMMOTH AVE · ZIP 91423

4136 MAMMOTH AVE→2 UNITS · BUILT 1925 · DUPLEX4240 MAMMOTH AVE→3 UNITS · BUILT 1938 · TRIPLEX4243 MAMMOTH AVE→4 UNITS · BUILT 2021 · FOURPLEX4320 MAMMOTH AVE→18 UNITS · BUILT 1961 · 5+ UNITS4325 MAMMOTH AVE→8 UNITS · BUILT 1960 · 5+ UNITS4328 MAMMOTH AVE→14 UNITS · BUILT 2001 · 5+ UNITS

SIMILAR SIZE AND ERA IN 91423

13036 RIVERSIDE DR→9 UNITS · BUILT 1986 · 9,084 SF13042 RIVERSIDE DR→11 UNITS · BUILT 1986 · 10,442 SF13050 RIVERSIDE DR→6 UNITS · BUILT 1977 · 5,577 SF13120 MOORPARK ST→14 UNITS · BUILT 1963 · 15,045 SF13156 RIVERSIDE DR→6 UNITS · BUILT 1981 · 7,772 SF13157 RIVERSIDE DR→14 UNITS · BUILT 1972 · 15,488 SF
EVERY BUILDING IN 91423 →RSO, 5–12 UNITS →
/// COMMON QUESTIONS · 4338 MAMMOTH AVE

The short answers.

Is 4338 Mammoth Ave rent controlled?

Built 1977 in the City of Los Angeles with 9 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 4338 Mammoth Ave have?

County records list 9 units at 4338 Mammoth Ave, classified as 5+ units across 8,664 square feet of building area, averaging about 963 square feet per unit. Unit counts on the roll can lag permitted conversions and unpermitted additions in both directions.

When was 4338 Mammoth Ave built?

The assessor roll gives a build year of 1977, 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 4338 Mammoth Ave last change hands?

The most recent transfer on the roll was recorded July 2008. Not every recorded transfer is a market sale — refinances, trust transfers, and family conveyances all appear in the same field, and those do not reset the assessed value.

What is 4338 Mammoth Ave assessed at, and is that what it is worth?

The current assessed value is $1,059,008 ($370,647 land, $688,361 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 — and this one has held its base year for roughly 39 years.

Would the owner of 4338 Mammoth Ave face a big tax bill on a sale?

Possibly. A base year going back roughly 39 years usually means a low tax basis, and a low basis means a large taxable gain on a straight sale — capital gains plus depreciation recapture, with California taxing gains at ordinary income rates. It is also why long-held buildings so often sell through a 1031 exchange instead, or pass through an estate for the step-up in basis.

How do I find out what 4338 Mammoth 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.

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