SKIP TO CONTENT
S.LOWENSTEIN
DEAL INDEXBUILDINGSMARKETSTOOLSGUIDESWHOCONTACTVALUATION_
VALUATION_
DEAL INDEXBUILDINGSMARKETSTOOLSGUIDESWHOCONTACTWHAT'S IT WORTH? →
THEME
DEAL INDEXBUILDINGSTRACK RECORDMARKETSMARKET REPORTTOOLSGUIDESDEAL ALERTSWATCHLISTWHOVALUATIONCONTACT
(323) 944-2221@SHAYASELLSLA
© 2026 SHAYA LOWENSTEIN · LYON STAHL INVESTMENT REAL ESTATE830 S PACIFIC COAST HWY, SUITE D-200, EL SEGUNDO, CA 90245SHAYA@LYONSTAHL.COM · DRE #01942326
BUILDINGS/21317 COSTANSO ST
/// BUILDING FILE · ROLL 2025

21317 COSTANSO ST.

Los Angeles, CA 91364 · APN 2167-002-034

/// 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

5

BUILDING SF

4,309

SF / UNIT

862

YEAR BUILT

1961

BEDROOMS

7

BATHROOMS

6

USE · CODE 0500

5+ UNITS

/// ASSESSED VALUE
LAND$1,020,000
IMPROVEMENTS$683,400
TOTAL$1,703,400
LAND BASE YEAR2024
OWNERSHIP TENUREAPPROX. 2 YEARS

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

/// LAST TRANSFER
RECORDEDMAY 9, 2024
EST. PRICE (2024)$1,670,000
EST. $/UNIT$334,000

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

/// RENT CONTROL

LIKELY COVERED BY LA RSO

Built 1961 in the City of Los Angeles with 5 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$547,500UNITS222044 COSTANSO ST→APR 2024EST.$1,127,000$563,500UNITS25317 CANOGA AVE→FEB 2024EST.$1,250,000$625,000UNITS25327 CANOGA AVE→AUG 2023EST.$2,955,000$985,000UNITS3

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 · DUPLEX21123 COSTANSO ST→2 UNITS · BUILT 1954 · DUPLEX21126 COSTANSO ST→7 UNITS · BUILT 1961 · 5+ UNITS21316 COSTANSO ST→5 UNITS · BUILT 1960 · 5+ UNITS

SIMILAR SIZE AND ERA IN 91364

21319 AVENUE SAN LUIS→5 UNITS · BUILT 1947 · 3,690 SF22430 AVENUE SAN LUIS→6 UNITS · BUILT 1956 · 6,886 SF22515 DEL VALLE ST→7 UNITS · BUILT 1964 · 5,031 SF22641 DEL VALLE ST→7 UNITS · BUILT 1964 · 5,031 SF22719 DEL VALLE ST→6 UNITS · BUILT 1955 · 2,898 SF22731 DEL VALLE ST→8 UNITS · BUILT 1964 · 4,738 SF
EVERY BUILDING IN 91364 →RSO, 5–12 UNITS →
/// COMMON QUESTIONS · 21317 COSTANSO ST

The short answers.

Is 21317 Costanso St rent controlled?

Built 1961 in the City of Los Angeles with 5 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 21317 Costanso St have?

County records list 5 units at 21317 Costanso St, classified as 5+ units across 4,309 square feet of building area, averaging about 862 square feet per unit. Unit counts on the roll can lag permitted conversions and unpermitted additions in both directions.

When was 21317 Costanso St built?

The assessor roll gives a build year of 1961, 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 21317 Costanso St last sell, and for how much?

The last recorded transfer was May 2024, at an estimated $1,670,000 — about $334,000 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 21317 Costanso St assessed at, and is that what it is worth?

The current assessed value is $1,703,400 ($1,020,000 land, $683,400 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 21317 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 →

NOT SELLING? GET DEALS LIKE THIS FIRST →