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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/21123 COSTANSO ST
/// BUILDING FILE · ROLL 2025

21123 COSTANSO ST.

Los Angeles, CA 91364 · APN 2167-002-022

/// 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

2

BUILDING SF

1,638

SF / UNIT

819

YEAR BUILT

1954

BEDROOMS

4

BATHROOMS

2

USE · CODE 0200

DUPLEX

/// ASSESSED VALUE
LAND$202,262
IMPROVEMENTS$294,200
TOTAL$496,462
LAND BASE YEAR2014
OWNERSHIP TENUREAPPROX. 12 YEARS

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

/// LAST TRANSFER
RECORDEDNOV 7, 2013

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 1954 in the City of Los Angeles with 2 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 91364

Recent sales nearby.

ADDRESSSOLDEST. PRICEEST. $/UNITUNITS
22004 CELES ST→OCT 2024EST.$1,128,000$564,000UNITS25048 TOPANGA CANYON BLVD→OCT 2024EST.$1,100,000$550,000UNITS25260 MARMOL DR→OCT 2024EST.$1,200,000$600,000UNITS24785 TOPANGA CANYON BLVD→AUG 2024EST.$1,136,000$568,000UNITS24937 TOPANGA CANYON BLVD→JUL 2024EST.$1,095,000$547,500UNITS221317 COSTANSO ST→MAY 2024EST.$1,670,000$334,000UNITS522044 COSTANSO ST→APR 2024EST.$1,127,000$563,500UNITS25317 CANOGA AVE→FEB 2024EST.$1,250,000$625,000UNITS2

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

/// COMPARE

Buildings like this one.

ON COSTANSO ST · ZIP 91364

21045 COSTANSO ST→2 UNITS · BUILT 1960 · DUPLEX21113 COSTANSO ST→2 UNITS · BUILT 1960 · DUPLEX21122 COSTANSO ST→2 UNITS · BUILT 1949 · DUPLEX21126 COSTANSO ST→7 UNITS · BUILT 1961 · 5+ UNITS21316 COSTANSO ST→5 UNITS · BUILT 1960 · 5+ UNITS21317 COSTANSO ST→5 UNITS · BUILT 1961 · 5+ UNITS

SIMILAR SIZE AND ERA IN 91364

21224 AVENUE SAN LUIS→2 UNITS · BUILT 1957 · 1,818 SF21227 DE LA GUERRA ST→2 UNITS · BUILT 1953 · 1,773 SF21228 AVENUE SAN LUIS→2 UNITS · BUILT 1956 · 2,064 SF21312 AVENUE SAN LUIS→2 UNITS · BUILT 1953 · 1,575 SF21315 DE LA GUERRA ST→2 UNITS · BUILT 1952 · 2,483 SF
EVERY BUILDING IN 91364 →RSO, 5–12 UNITS →
/// COMMON QUESTIONS · 21123 COSTANSO ST

The short answers.

Is 21123 Costanso St rent controlled?

Built 1954 in the City of Los Angeles with 2 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 21123 Costanso St have?

County records list 2 units at 21123 Costanso St, classified as duplex across 1,638 square feet of building area, averaging about 819 square feet per unit. Unit counts on the roll can lag permitted conversions and unpermitted additions in both directions.

When was 21123 Costanso St built?

The assessor roll gives a build year of 1954, 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 21123 Costanso St last change hands?

The most recent transfer on the roll was recorded November 2013. 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 21123 Costanso St assessed at, and is that what it is worth?

The current assessed value is $496,462 ($202,262 land, $294,200 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 12 years.

How do I find out what 21123 Costanso St 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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