HCM-73 — designated 1971-02-03
Residence
1329 Carroll Avenue
stone-family or non-stone masonry construction per bariscale material classification — the envelope is the artifact, architectural-significance argument unambiguous regardless of per-axis rubric signals. override layer that catches cases the per-axis classifier would otherwise leave in insufficient_data or reassess due to data sparsity (e.g. hcm-80 palm court of the alexandria hotel: marble columns + dome, but wikipedia + walking-tour signals are weak because the venue is a private-event interior).
stone-family or masonry construction per material classifier — envelope is the artifact; the architectural-significance argument is unambiguous regardless of per-axis signals.
street view ↗ satellite ↗ big orange landmarks ↗ (bariscale, 2007) stone · marble + cast-iron (orchestrator-captured imagery is not building-aimed — use these for HITL verification)
Six-axis scores
- A. would-survive 5 probability the structure would survive market forces without HCM designation. low = needs protection.
- B. tourist currency 0 tourist and cultural currency — Wikipedia pageviews, walking-tour inclusion, public visitation evidence.
- C. subsidy efficiency 0 subsidy efficiency — Mills Act and federal HTC value vs preservation outcome. zero means no active subsidy.
- D. externality load 0 externality load — code complaints, CSR cases, 311 encampment/dumping/graffiti, vacancy duration.
- E. neighborhood health 6 neighborhood health — median household income, distress indicators, displacement risk.
- F. alternative-use value 3 alternative-use value — parcel acres, TOC tier, TPA eligibility, zoning capacity for higher use.
overall confidence: unknown
Site
- lat / lon
- 34.06954, -118.25403
- parcel acres
- 0.17260703896425603 (inferred)
- typology
- sfr
- TPA / TOC
- yes — tier 1
- zoning capacity
- —
- nrhp listed
- no
- architect prominence
- —
Condition + subsidy
all "condition" fields below are proxies derived from LADBS permit history, 311 CSR cases, and code complaints. none of these directly measures occupancy. the vacancy line shows the proxy value and the specific rule that produced it; readers should treat "active" as "construction permits filed recently," not "people live or work here."
- vacancy proxy
- active
- vacancy proxy basis
- recent investment over 250k in 60mo
- last permit
- 2023
- permits last 24mo
- 0
- code complaints 24mo
- 0
- CSR open cases
- 0
- Mills Act contract
- no — not in la OHR appendix a (2019 list of Mills Act properties)
- federal HTC
- no
- Wikipedia pageviews 12mo
- —
- walking-tour inclusion
- no
- median hhi (tract)
- $90,192
- assessed value
- —
Street view vision classification
claude vision analyzed 4 Google street view captures (n/e/s/w from the parcel coordinates) for visible distress indicators. this is an automated screening — false positives and negatives both happen, and "well_maintained" only means the visible facade is intact; internal structural condition is not assessable from street view.
- building visible
- yes
- building type
- sfr
- overall condition
- well maintained
- other indicators
- none visible
- notes
- A well-preserved Victorian-era single-family residence is clearly visible at heading 0°, appearing in good structural condition with intact ornamental detailing, no visible damage or distress indicators.
Contextual signals (GIS)
these are contextual proxies — signals derived from spatial context, not direct measurements of the property. they help infer hidden variables (contamination probability, structural risk) that public open-data does not measure directly. source: cal OEHHA CalEnviroScreen 4.0 (cumulative pollution burden by census tract).
- census tract
- 6037197600
- CalEnviroScreen overall percentile
- 71.9 (decile 8)
- cleanups percentile
- 28.4
- groundwater threats percentile
- 57.3
- hazardous waste percentile
- 76.7
- toxic release percentile
- 77.6
- lead exposure percentile
- 76.2
- EnviroStor cleanup sites nearby
- —
- in CGS liquefaction zone
- no
- type-1 contamination probability (fused)
- 0.50 — moderate
- type-2 structural-risk probability
- 0.20 — low
Narrative
history
hcm-73 is designated as a single-family residence within the los angeles historic cultural monument inventory. specific construction date, original owner, and architect are not recorded in the available data, and no nrhp listing exists to supplement the record. the absence of architect attribution and assessed value data suggests either an undocumented vernacular builder-designed structure or a record-keeping gap in the city's monument files. no major documented events, ownership transfers of historical note, or adaptive reuse history could be confirmed from the fetched data. all historical claims beyond designation status must be treated as unverified pending primary source research (approximately all construction-era detail).
architectural significance
the typology is classified as single-family residential, but no stylistic descriptor, period of construction, or architect of record is available in the current dataset. without those fields it is not possible to characterize the architectural style, identify comparable extant examples in los angeles, or assess distinctive features with any defensible specificity. this represents a significant evidentiary gap: a meaningful architectural evaluation requires at minimum a site survey, building permit records, or a prior nomination report. any prior designation narrative should be retrieved from the office of historic resources files before further scoring is attempted.
neighborhood context
the tract surrounding hcm-73 reports a median household income of $90,192, placing it in the upper-middle income band for los angeles county and well above the countywide median. population declined by 114 residents over the measured five-year window, a modest contraction that is consistent with household-size compression or ownership-tenure stability rather than disinvestment. the 311 externality load is effectively zero — no encampment, dumping, or graffiti incidents were recorded within 500 feet over the 24-month observation period. transit proximity and toc/tpa designation are unconfirmed. the neighborhood profile suggests a stable, relatively affluent residential context with no observable block-level distress signal around the hcm itself. | metric | value | |---|---| | census tract | 06037197600 | | median hhi | 90192 | | 5yr δ population | -114 | | 311 within 500ft (24mo) | 0 | | encampment 311 calls | 0 | | ladbs code complaints (24mo) | — | | last permit year | — |
subsidy and condition
| field | value | |---|---| | mills act | — | | federal htc | — | | vacancy status | — |
classification reasoning
axis a (survival without protection) scores 5 at medium confidence. a median hhi of $90,192 in the surrounding tract implies market conditions that could plausibly sustain an owner-maintained historic residence without the incentive structure of hcm designation, but the absence of mills act enrollment data, recent investment evidence, and comparable-example counts prevents a more precise read. the score reflects genuine ambiguity rather than a confident midpoint. axis b (tourist/cultural currency) scores 0; no google reviews, wikipedia pageview data, walking tour inclusion, or nps designation is present in the record. this is an unknown-confidence score — the data are absent rather than confirmed negative, though single-family residences in non-landmark residential districts rarely generate meaningful visitor traffic. axes c and d (subsidy efficiency and externality load) score 0 each. for c, there is no mills act contract, no federal htc enrollment, and no vacancy or code-complaint data, making the subsidy ledger effectively unreadable. for d, the 311 proxy metrics are all zero and medium confidence is assigned, meaning the block immediately surrounding the hcm shows no observable negative spillover — a genuine finding, not a data gap. axis e (neighborhood health) scores 6 at high confidence, the only high-confidence score in the set; the hhi and population data are reliable acs tract-level figures indicating a stable, non-distressed neighborhood. axis f (alternative use value) scores 0 at unknown confidence; parcel acreage, zoning capacity, and tpa/toc tier are all missing, making it impossible to estimate redevelopment upside. the candidate flag is not triggered. while a≤4 is not met (a=5) and f is unknown (not ≥6), the more fundamental disqualifier is overall confidence rated 'unknown' — the framework requires at minimum 'medium' confidence across gating axes, and three axes (b, c, f) return unknown confidence. the reassess flag is the correct output: mixed signals exist (a moderately scored a axis, a confirmed stable neighborhood, zero externality load) but critical data fields — parcel size, zoning capacity, mills act status, architectural documentation, and any form of cultural currency evidence — are absent. a field survey and records pull from ohr, the assessor's parcel database, and the building permit archive are required before any disposition recommendation can be defended.
sources
- la311: https://data.lacity.org/resource/h65r-yf5i.json?$where=within_circle(location%2c%2034.06953850434423%2c%20-118.25402817948286%2c%20152)%20and%20createddate%20%3e%20'2024-05-10'&$limit=1000 --- _generated by hcm-1200 orchestrator on 2026-05-10t22:29:31.684z._