HCM-98 — designated 1972-03-15
Mount Pleasant House (Heritage Square)
3800 Homer Street
residential typology + high structural-risk probability. type-2 pattern probable but covenant/subsidy linkage not confirmed.
street view ↗ satellite ↗ big orange landmarks ↗ (bariscale, 2007) stucco (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 5 neighborhood health — median household income, distress indicators, displacement risk.
- F. alternative-use value 7 alternative-use value — parcel acres, TOC tier, TPA eligibility, zoning capacity for higher use.
overall confidence: unknown
Site
- lat / lon
- 34.08832, -118.20822
- parcel acres
- 4.246240438308822 (inferred)
- typology
- sfr
- TPA / TOC
- yes — tier 3
- 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
- single permit within 5y
- 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)
- $55,573
- 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
- civic
- overall condition
- well maintained
- type-1 indicators (industrial obsolescence)
- rail spur remnant
- other indicators
- none visible
- notes
- Heritage Square Museum complex is clearly visible with well-maintained Victorian structures, manicured grounds, and a preserved historic rail car displayed as an exhibit; no distress indicators observed.
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
- 6037199400
- CalEnviroScreen overall percentile
- 91.6 (decile 10)
- cleanups percentile
- 88.0
- groundwater threats percentile
- 49.8
- hazardous waste percentile
- 11.1
- toxic release percentile
- 74.5
- lead exposure percentile
- 89.3
- EnviroStor cleanup sites nearby
- —
- in CGS liquefaction zone
- yes — designated under seismic hazards mapping act of 1990
- type-1 contamination probability (fused)
- 0.45 — moderate
- type-2 structural-risk probability
- 0.70 — elevated (liquefaction zone membership combined with pre-modern-code designation date)
Narrative
history
the mount pleasant house is a victorian-era single-family residence relocated to heritage square museum in the montecito heights neighborhood of los angeles. heritage square, operated by the cultural heritage foundation of southern california, was established in the 1960s as a rescue site for historic structures threatened by urban renewal and freeway construction; the mount pleasant house was moved there as part of that preservation effort. the structure dates to the late nineteenth century (approximately 1876–1885), consistent with the eastlake and italianate vernacular forms common to los angeles's earliest residential subdivisions. no architect of record has been identified in available documentation. the house has served primarily as a museum exhibit structure within heritage square's open-air campus, functioning alongside several other relocated victorian buildings as a collectively interpreted site rather than as a stand-alone landmark. no major fire, ownership dispute, or demolition event has been recorded against this specific structure beyond the original relocation.
architectural significance
the mount pleasant house represents the eastlake-influenced victorian vernacular typology prevalent in southern california residential construction of the 1870s through 1890s, characterized by decorative spindlework, projecting bays, and wood-frame balloon construction. as a relocated, museumified example, its closest functional comparables within los angeles are the other structures on the heritage square campus itself — the hale house, the palms depot, and the valley knudsen garden-residence — as well as the surviving victorian stock in carroll avenue (angelino heights, hpoz), which remains in situ and in active residential use. the mount pleasant house's primary architectural significance is its relative completeness as a type specimen; however, the relocation from its original site and the absence of a named architect limit the argument that it retains exceptional integrity in the nrhp sense. extant in-situ comparables on carroll avenue are arguably stronger architectural-integrity examples of the same building type.
neighborhood context
heritage square sits within or immediately adjacent to a census tract reporting a median household income of $55,573 — roughly 65 percent of the los angeles county median — and a five-year population decline of 23 persons, indicating a modestly distressed or stagnant district rather than a gentrifying one. the 311 externality load around the parcel is essentially zero across all measured categories (encampments, dumping, graffiti), which is consistent with heritage square's enclosed, actively managed campus character rather than any signal of neighborhood health. transit proximity and toc/tpa designation data are unavailable, and zoning capacity data are missing, preventing a confident assessment of redevelopment pressure. the neighborhood trajectory score (e = 5) reflects genuine income constraint and mild population loss without acute crisis indicators. | metric | value | |---|---| | census tract | 06037199400 | | median hhi | 55573 | | 5yr δ population | -23 | | 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, score 5): the building's survival is effectively guaranteed by its current institutional setting — heritage square's entire mission is physical custody of these structures — but that protection is organizational, not market-driven. no nrhp listing, no identified architect, and no independent adaptive-reuse demand signal are present. the score reflects that the structure would not survive demolition pressure if heritage square were to dissolve, but faces no imminent market threat in its current context. confidence is medium. axis b (tourist/cultural currency, score 0): no google review count, wikipedia pageview data, tripadvisor presence, or walking-tour inclusion data were returned for this specific structure. heritage square as a whole has modest tourist traffic, but no signal can be disaggregated to the mount pleasant house individually. confidence is unknown, meaning this score cannot gate any recommendation. axis c (subsidy efficiency, score 0): no mills act contract, federal historic tax credit, or vacancy-with-subsidy data are available. the zero score here means the axis is uninformative rather than indicating poor performance. confidence is unknown. axis d (externality load, score 0): 311 data returns zero events across all categories within 500 feet over 24 months. this is likely an artifact of the enclosed campus geography rather than a signal of neighborhood vitality; it is a reliable low-load reading. confidence is medium. axis e (neighborhood health, score 5): the tract-level hhi of $55,573 and a five-year population decline of 23 place this squarely at the midpoint — neither a thriving district nor a severely distressed one. confidence is high. axis f (alternative use value, score 0): parcel acreage, zoning capacity, and tpa/toc tier are all null. no buildable-land scarcity or redevelopment pressure estimate can be constructed. confidence is unknown. the candidate flag is not triggered. while e ≤ 5 is satisfied, the conditions a ≤ 4 is not met (a = 5), and f ≥ 6 is not met (f = 0/unknown). more critically, overall confidence is rated 'unknown' because three of six axes — b, c, and f — lack any data, violating the confidence_min: medium gate. the reassess flag is the appropriate output: the data gaps are too large to support any affirmative classification, and field validation (confirming mills act status, parcel dimensions, visitor counts disaggregated by structure, and any pending ownership or institutional changes at heritage square) is required before a definitive recommendation can be made.
sources
- la311: https://data.lacity.org/resource/h65r-yf5i.json?$where=within_circle(location%2c%2034.08831768901572%2c%20-118.20822360632522%2c%20152)%20and%20createddate%20%3e%20'2024-05-10'&$limit=1000 --- _generated by hcm-1200 orchestrator on 2026-05-10t22:42:08.921z._