HCM-74 — designated 1971-02-03
Residence
1345 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) brick (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
- 34.06979, -118.25443
- parcel acres
- 0.1725960722222339 (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
- partial
- building type
- sfr
- overall condition
- well maintained
- other indicators
- none visible
- notes
- A Victorian-era residence at 1345 Carroll Avenue is partially visible in the north-facing image, showing ornate detailing and well-maintained facade with no visible 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)
- 0.49 — moderate
- type-2 structural-risk probability
- 0.20 — low
Narrative
history
hcm-74 is designated in the los angeles historical cultural monument registry as a residential structure, classified under single-family residence (sfr) typology. specific construction date, original architect, and initial ownership history are not recoverable from the fetched dataset; these details are absent or were not captured in the current data pull. no major documented events, ownership transfers, or alterations are on record in this dataset. without a verified build date or architect attribution, all claims about the structure's origins must be treated as unconfirmed. the absence of nrhp listing further limits independent corroboration of historical significance claims made at the time of hcm designation.
architectural significance
no architect prominence data is recorded for hcm-74, and no stylistic classification was returned in the fetched record. as a single-family residence in los angeles, the structure could plausibly fall within any of several common residential typologies present throughout the city — craftsman bungalow, spanish colonial revival, mid-century modern tract house, or vernacular postwar construction — but assigning a style without field documentation or archival records would be speculative. comparable extant examples of residential hcms citywide are numerous, which itself bears on the counterfactual survival analysis. without photographic or permit records, an honest architectural characterization is not possible at this stage.
neighborhood context
the tract surrounding hcm-74 records a median household income of $90,192, placing it in the upper-middle range relative to los angeles county overall and scoring a 6 on the neighborhood health axis (e). population declined by approximately 114 persons over the most recent five-year measurement window, a modest contraction that does not indicate severe distress but does suggest the immediate area is not experiencing net residential growth. no 311 service calls related to dumping, graffiti, or encampments are recorded within the immediate footprint of the property itself. transit proximity and business license churn data were not returned in this data pull, limiting a complete picture of district trajectory. | 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 (would_survive_without_protection) scores 5 at medium confidence, reflecting a genuine ambiguity: the structure is a single-family residence in a tract with above-median household income, which implies some market durability, but the lack of architect prominence, nrhp listing, or documented adaptive reuse demand prevents a higher score. the mid-range score means the building does not clearly meet the a ≤ 4 threshold required for a candidate flag. axis b (tourist/cultural currency) scores 0, but confidence is marked unknown due to total absence of google review data, wikipedia pageviews, and walking tour confirmation — this is a data gap, not a confirmed zero; field verification could change this score in either direction. axes c and d both score 0 at their respective confidence levels. the d = 0 score at medium confidence is substantively meaningful: encampment, dumping, and graffiti counts are all zero, and no code complaints or fire calls are recorded, indicating no measurable negative externality load on the immediate block. the c = 0 is rated unknown confidence because mills act and federal htc data are absent; it is not possible to assess subsidy efficiency without knowing whether a contract exists. axis e scores 6 at high confidence, grounded in the $90,192 tract-level median hhi and modest negative population change. this score exceeds the e ≤ 5 threshold required for a candidate flag, confirming the tract is not in genuine distress or active transitional deterioration. axis f scores 0 at unknown confidence due to missing parcel acreage, zoning capacity, and tpa/toc tier data; redevelopment value cannot be assessed. the combination of f = 0 and unknown confidence means the f ≥ 6 candidate threshold is not met, and the data infrastructure to evaluate it does not currently exist. the overall confidence is rated unknown because three of six axes — b, c, and f — lack the underlying data necessary to produce defensible scores. the candidate flag conditions are not met: a = 5 (threshold requires ≤ 4), e = 6 (threshold requires ≤ 5), and f = 0 with unknown confidence (threshold requires ≥ 6). the reassess flag is the correct assignment: the structure neither clearly warrants protection nor clearly warrants removal from hcm status, and the data gaps are material enough that a field investigation and records pull are required before any policy action.
sources
- la311: https://data.lacity.org/resource/h65r-yf5i.json?$where=within_circle(location%2c%2034.06978808151402%2c%20-118.2544345104508%2c%20152)%20and%20createddate%20%3e%20'2024-05-10'&$limit=1000 --- _generated by hcm-1200 orchestrator on 2026-05-10t22:29:56.838z._