{
  "as_of": "2026-11-07",
  "source": "philly_land_tax_research scripts/philadelphia_land_assessment_one_pager.py",
  "reform": {
    "surface": "opav",
    "scenario": "resplit_fixed",
    "description": "rate unchanged; built parcels' OPA totals re-split on land interpolated from OPA's own vacant-lot values; vacant lots unchanged"
  },
  "fmt": {
    "tax_year": "2026",
    "default_in_10": "9 in 10",
    "default_fraction": "one-fifth",
    "improved_parcels": "541,000",
    "corr_opa": "1.00",
    "abated_premium_opa": "2.2",
    "pairs_agree_opa": "12%",
    "matched_pairs": "1,180",
    "pair_radius": "150 meters",
    "pair_size_match": "20%",
    "pair_tolerance": "10%",
    "corr_cells": "2,218",
    "lot_sales_abated": "684",
    "lot_sales_same_lot": "814",
    "lot_area_tolerance": "10%",
    "lot_n_0": "88",
    "lot_n_1": "83",
    "lot_n_2": "177",
    "lot_n_3": "221",
    "lot_n_4": "114",
    "lot_rel": "2.4 times",
    "lot_rel_lo": "2.0",
    "lot_rel_hi": "2.7",
    "lot_rel_round": "2×",
    "lot_rel_min": "1.6",
    "lot_rel_max": "2.4",
    "lot_top_min": "0.97×",
    "lot_top_max": "2.01×",
    "lot_bottom_min": "0.52×",
    "lot_bottom_max": "0.82×",
    "lot_arms": "six",
    "lot_rs_min_years": "three",
    "cod_built_sales": "1,114",
    "support_edge": "10,000",
    "lot_ratio_0": "0.64×",
    "lot_ratio_1": "0.81×",
    "lot_ratio_2": "0.83×",
    "lot_ratio_3": "1.17×",
    "lot_ratio_4": "1.53×",
    "lot_ratio_poor": "1.20×",
    "lot_ratio_rich": "0.66×",
    "lot_years": "2020–2024",
    "example_area": "a North Philadelphia block",
    "pair_area": "1,330",
    "pair_land_abated": "$170,000",
    "pair_total_abated": "$850,000",
    "pair_land_home": "$24,300",
    "pair_total_home": "$121,600",
    "pair_year_abated": "2022",
    "pair_year_home": "1915",
    "pair_ratio": "7 times",
    "vacant_pool": "41,000",
    "cod_built_opa": "48%",
    "cod_built_opav": "37%",
    "homes_unchanged_pct": "96%",
    "unchanged_pct": "96%",
    "abated": "20,000",
    "abated_up_pct": "50%",
    "abated_down_pct": "49%",
    "abated_median_up": "+$427",
    "abated_median_down": "−$394",
    "abated_nonwhite_down_pct": "73%",
    "abated_nonwhite_change": "−19%",
    "abated_white_up_pct": "51%",
    "abated_white_change": "+10%",
    "levy_change": "$3.2 million",
    "levy_change_pct": "+0.1%",
    "rate_today": "1.3998%",
    "rate_held": "1.3977%",
    "lvt_opav_poor": "−6.8%",
    "lvt_opav_rich": "−3.5%",
    "lvt_opav_nonwhite": "−16.3%",
    "lvt_opav_white": "−4.2%",
    "lvt_opa_poor": "−3.8%",
    "lvt_opa_rich": "−6.6%",
    "lvt_opa_nonwhite": "−3.7%",
    "lvt_opa_white": "−6.1%",
    "per_100": "$100",
    "per_100_land": "$20",
    "moved_gross": "$29 million",
    "moved_up": "$16.0 million",
    "moved_down": "$12.8 million",
    "moved_billed": "$86 million",
    "moved_new_gross": "$22.0 million",
    "abated_at_fifth_pct": "69%",
    "take_back_round": "7%",
    "take_back_nonwhite_round": "13%",
    "take_back": "6.9%",
    "take_back_nonwhite": "13.3%",
    "take_back_white": "3.0%",
    "take_back_poor": "10.2%",
    "take_back_rich": "2.9%",
    "take_back_lo": "5.9%",
    "take_back_hi": "8.4%",
    "take_back_span_lo": "6.7%",
    "take_back_span_hi": "6.9%",
    "take_back_old": "13.6%",
    "old_abatement_construction": "12.1%",
    "supply_horizon": "20 years",
    "supply_calibration": "2023–25",
    "supply_old_years": "2010–2019",
    "jll_range": "30–40%"
  },
  "raw": {
    "tax_year": 2026.0,
    "default_ratio_share": 0.887,
    "default_ratio": 0.2,
    "improved_parcels": 540812.0,
    "corr_opa": 1.0,
    "abated_premium_opa": 2.16,
    "pairs_agree_opa": 0.12,
    "matched_pairs": 1180.0,
    "pair_radius_m": 150.0,
    "pair_size_match": 0.2,
    "pair_tolerance": 0.1,
    "corr_cells": 2218.0,
    "lot_sales_abated": 684,
    "lot_ratio_0": 0.6449,
    "lot_ratio_1": 0.8075,
    "lot_ratio_2": 0.8343,
    "lot_ratio_3": 1.1734,
    "lot_ratio_4": 1.5294,
    "lot_n_0": 88,
    "lot_n_1": 83,
    "lot_n_2": 177,
    "lot_n_3": 221,
    "lot_n_4": 114,
    "lot_ratio_poor": 1.1959,
    "lot_ratio_rich": 0.659,
    "lot_gap": 0.8845,
    "lot_gap_lo": 0.7006,
    "lot_gap_hi": 1.0305,
    "lot_rel": 2.3716,
    "lot_rel_lo": 1.9602,
    "lot_rel_hi": 2.6671,
    "lot_arms": 6,
    "lot_headline_index": "repeat sales, strict",
    "lot_rs_min_years": 3.0,
    "lot_rel_min": 1.65,
    "lot_rel_max": 2.4362,
    "lot_rel_lo_min": 1.3862,
    "lot_all_ordered": true,
    "lot_top_min": 0.9721,
    "lot_top_max": 2.0076,
    "lot_bottom_min": 0.522,
    "lot_bottom_max": 0.8241,
    "lot_rel_inc": 1.8147,
    "lot_rel_inc_min": 1.4001,
    "lot_rel_inc_lo_min": 1.1545,
    "lot_sale_years": [
      2020,
      2021,
      2022,
      2023,
      2024
    ],
    "lot_sales_same_lot": 814,
    "lot_area_tolerance": 0.1,
    "pair_area": 1330.0,
    "pair_area_home": 1330.0,
    "pair_land_abated": 170000.0,
    "pair_total_abated": 850000.0,
    "pair_land_home": 24300.0,
    "pair_total_home": 121600.0,
    "pair_year_abated": 2022,
    "pair_year_home": 1915,
    "pair_ratio": 6.995884773662551,
    "vacant_pool": 40688,
    "cod_built_sales": 1114,
    "support_edge_sqft": 10000.0,
    "cod_built_opa": 47.5641,
    "cod_built_opav": 36.5017,
    "billed": 546317,
    "moved": 20197,
    "levy_change_musd": 3.195134,
    "levy_before_musd": 2143.764372,
    "held_rate_change": -0.0014880000000000448,
    "homes_unchanged_share": 0.962042,
    "unchanged_share": 0.9630299999999999,
    "homestead_unchanged_share": 1.0,
    "abated": 20492,
    "abated_up_share": 0.499707,
    "abated_down_share": 0.485897,
    "abated_median_up_usd": 427.2554,
    "abated_median_down_usd": 394.0849,
    "abated_nonwhite_down_share": 0.7310089999999999,
    "abated_nonwhite_change_pct": -18.6078,
    "abated_white_up_share": 0.50668,
    "abated_white_change_pct": 10.1107,
    "homes_up_share": 0.018665,
    "homes_down_share": 0.019292,
    "moved_parcels": 20227,
    "moved_up_musd": 15.9755177017,
    "moved_down_musd": 12.7950149868,
    "moved_gross_musd": 28.7705326884,
    "moved_net_musd": 3.1805027149,
    "moved_billed_musd": 86.3806312509,
    "moved_new_gross_musd": 21.9617568426,
    "abated_at_fifth_share": 0.6930452203777905,
    "take_back": 0.06872715728966043,
    "take_back_nonwhite": 0.13275285403994996,
    "take_back_white": 0.029817222385493537,
    "take_back_poor": 0.10204686110726,
    "take_back_rich": 0.029236300309492,
    "take_back_lo": 0.058942335593610305,
    "take_back_hi": 0.08384776143935577,
    "take_back_span_lo": 0.06737133077199946,
    "take_back_span_hi": 0.06948040957450315,
    "take_back_old": 0.13576341842816134,
    "take_back_adds_fix": 4694,
    "take_back_adds_opa": 4371,
    "take_back_difference": 323,
    "supply_fix_net_units": 323,
    "supply_fix_land_file": "opa_vacant_land_ty2026.parquet",
    "supply_run": "2026-11-07",
    "old_abatement_construction_share": 0.12079146226272248,
    "supply_horizon_years": 20,
    "supply_calibration_years": [
      2023,
      2025
    ],
    "supply_old_years": [
      2010,
      2019
    ],
    "lvt_opav_poor": -6.8364,
    "lvt_opav_rich": -3.5499,
    "lvt_opav_nonwhite": -16.3428,
    "lvt_opav_white": -4.1866,
    "lvt_opa_poor": -3.8354,
    "lvt_opa_rich": -6.5927,
    "lvt_opa_nonwhite": -3.7389,
    "lvt_opa_white": -6.0741,
    "rate_today_pct": 1.3998,
    "rate_held_pct": 1.3977170976,
    "fix_land_file": "opa_vacant_land_ty2026.parquet",
    "fix_land_written": "2026-10-27"
  }
}