Zoning › Arizona › Pima County › Tucson

Tucson, AZ Zoning

Euclidean-zoning. 22 districts · 14 overlays · 7 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
mixed

Tucson operates two parallel Euclidean codes — legacy Land Use Code (LUC, Chapter 23) for pre-UDC parcels and Unified Development Code (UDC, Chapter 23B) for post-2013 rezonings. Base-district naming encodes density tier rather than lot-size-in-thousands: Rural (RH, SR), Suburban (SH, RX-1, RX-2), Urban Residence (R-1, R-2, R-3), Mobile Home (MH-1, MH-2), Office (O-1/2/3), Commercial (C-1/2/3), Office/Commercial/Residential (OCR-1/2), Industrial (P-I, I-1, I-2). Floodplain (Ch. 25) and WASH watercourse/habitat (Ch. 29) regulations sit outside the UDC in separate Tucson Code chapters. Middle Housing Zone (Aug 2025) is the HB 2721 compliance mechanism. | naming_convention_raw=density-tier-encoded ; sub_flags_raw=[dual-code-regime, arizona-housing-bills-2024, state-preemption-active, afb-adjacent-dmafb, part77-active-ktus]

Worth knowing
  • Two parallel zoning codes operate simultaneously in Tucson — the legacy Land Use Code (LUC, Chapter 23) continues to govern parcels zoned under that system, while the newer Unified Development Code (UDC, Chapter 23B) governs parcels rezoned since UDC adoption (2013). Both remain active. A parcel-level zoning analysis must first determine which code applies before any dimensional lookup. — [Tucson Code Chapter 23 (LUC) and Chapter 23B (UDC); Tucson Planning & Development Services practice]
  • Height-based perimeter yards — interior setbacks in Tucson are not fixed in feet but are expressed as the GREATER of a minimum value or a multiple of building height (e.g., 6' or 2/3(H) residential-adjacent; 10' or 3/4(H) nonresidential-adjacent). Taller buildings generate larger required yards. This is a structural difference from typical fixed-dimension setbacks and materially affects massing studies in R-2/R-3/OCR-1/OCR-2. — [c§UDC Art. 6.3.4]
  • Two-track street setbacks — street perimeter yards operate on an Established Area versus Developing Area (MS&R) track. Established Area front yards = greater of 20 ft or 1.5(H). Developing Area front yards = determined by MS&R map centerline offset. This creates dynamic setback requirements depending on how an area is classified. — [c§UDC Art. 6.3.4; Art. 5.4 (MSR)]

+ 7 more in Quirks & notes

Districts

residential_sf 9commercial 4office 3industrial 3mixed_use 2residential_mf 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
RHRural Homesteadresidential_sf180,000 sf[4]30 ft[5]0.2[6]0.5[7]0.24[8]—25[1] / 25[2] / 10[3]
SRSuburban Ranchresidential_sf144,000 sf[12]30 ft[13]0.15[14]0.5[15]0.3[16]—25[9] / 25[10] / 10[11]
SHSuburban Homesteadresidential_sf36,000 sf[20]30 ft[21]0.15[22]0.5[23]1.21[24]—25[17] / 25[18] / 10[19]
RX-1Suburban Residence 1residential_sf36,000 sf[28]30 ft[29]0.15[30]0.5[31]1.21[32]—25[25] / 25[26] / 10[27]
RX-2Suburban Residence 2residential_sf16,000 sf[36]25 ft[37]0.15[38]0.5[39]2.72[40]—25[33] / 25[34] / 10[35]
R-1Urban Residence (Low)residential_sf7,000 sf[44]70 ft[45]0.25[46]0.5[47]8[48]—25[41] / 6[42] / 10[43]
R-2Urban Residence (Medium)residential_sf5,000 sf[52]70 ft[53]0.25[54]0.5[55]15[56]—25[49] / 6[50] / 10[51]
R-3Urban Residence (High)residential_mf5,000 sf[60]70 ft[61]0.25[62]0.5[63]—[64]—25[57] / 6[58] / 10[59]
MH-1Mobile Home (Low)residential_sf5,000 sf[68]70 ft[69]0.25[70]0.5[71]8[72]—25[65] / 6[66] / 10[67]
MH-2Mobile Home (Medium)residential_sf5,000 sf[76]75 ft[77]0.25[78]0.5[79]15[80]—25[73] / 6[74] / 10[75]
O-1Office (Low)office5,000 sf[84]70 ft[85]0.5[86]0.5[87]8[88]—25[81] / 10[82] / 10[83]
O-2Office (Medium)office5,000 sf[92]70 ft[93]0.5[94]0.5[95]8[96]—25[89] / 10[90] / 10[91]
O-3Office (High)office5,000 sf[100]75 ft[101]0.5[102]0.5[103]22[104]—25[97] / 10[98] / 10[99]
C-1Commercial (Neighborhood)commercial5,000 sf[108]75 ft[109]0.5[110]0.5[111]36[112]—25[105] / 10[106] / 10[107]
C-2Commercial (General)commercial5,000 sf[116]70 ft[117]0.5[118]0.5[119]44[120]—25[113] / 10[114] / 10[115]
C-3Commercial (High Intensity)commercial5,000 sf[124]80 ft[125]0.5[126]0.5[127]87[128]—25[121] / 10[122] / 10[123]
OCR-1Office/Commercial/Residential 1mixed_use5,000 sf[132]140 ft[133]0.8[134]0.5[135]—[136]—25[129] / 25[130] / 10[131]
OCR-2Office/Commercial/Residential 2mixed_use5,000 sf[140]300 ft[141]0.8[142]0.5[143]—[144]—25[137] / 25[138] / 10[139]
NCNeighborhood Commercialcommercial5,000 sf[148]16 ft[149]0.5[150]0.5[151]——25[145] / 10[146] / 10[147]
P-IPark Industrialindustrial5,000 sf[155]50 ft[156]0.5[157]0.5[158]——25[152] / 25[153] / 10[154]
I-1Light Industrialindustrial5,000 sf[162]75 ft[163]0.5[164]0.5[165]——25[159] / 25[160] / 10[161]
I-2Heavy Industrialindustrial5,000 sf[169]140 ft[170]0.5[171]0.5[172]——25[166] / 25[167] / 10[168]

Confidence: confirmed partial under review not found

Overlays

HDZ
Hillside Development Zone
SPEC
c§UDC Art. 5.2

Designated hillside areas shown on the official Hillside Development Zone Map — generally parcels with slopes greater than 15%. Applies across residential, commercial, mixed-use, and office base zones where mapped.

SCZ
Scenic Corridor Zone
SPEC
c§UDC Art. 5.3

Parcels adjacent to designated scenic routes — primarily mountain-approach corridors and arterials with ridgeline views into the Tucson, Catalina, Rincon, and Tortolita mountains.

MSR
Major Streets and Routes Setback Zone
SPEC
c§UDC Art. 5.4

Parcels fronting on corridors designated on the Tucson Major Streets and Routes (MS&R) map — primarily arterials and collectors slated for future ROW expansion.

GCZ
Gateway Corridor Zone
SPEC
c§UDC Art. 5.5

Designated gateway corridor locations — major entry routes into Tucson (I-10, I-19, Speedway, Grant, 22nd St, Broadway, etc.). Applied to residential, commercial, office, and mixed-use parcels along those corridors.

AEZ
Airport Environs Zone
SPEC
c§UDC Art. 5.6

Parcels within the Airport Influence Area for Tucson International Airport (KTUS) AND Davis-Monthan Air Force Base (DMAFB), as defined by FAA-approved airport layout plans and military AICUZ noise-contour maps. Combined AEZ geography covers substantial portions of south and southeast Tucson.

ERZ
Environmental Resource Zone
SPEC
c§UDC Art. 5.7

Open lands and habitat resource areas designated on the Environmental Resource Zone Map — typically washes, riparian corridors, and significant wildlife habitat (including Sonoran Desert saguaro forest).

HPZ_HL
Historic Preservation Zone & Historic Landmark
SPEC
c§UDC Art. 5.8

Specific neighborhoods and individual properties designated by Mayor and Council after nomination and hearing process. Current HPZs include Barrio Historico, Barrio Viejo, Armory Park, El Presidio, West University, Fort Lowell, and others.

DSO
Drachman School Overlay Zone
SPEC
c§UDC Art. 5.9

Specific area around the former Drachman School site (downtown-adjacent neighborhood near 16th St and Convent).

NPZ
Neighborhood Preservation Zone
SPEC
c§UDC Art. 5.10

Specific established neighborhoods designated by petition and Council action. Protects existing character from incompatible infill.

CCT
Community Corridors Tool
SPEC
c§UDC Art. 5.11, with interaction rules in §5.11.2

Sites along designated community corridors near transit facilities, located in the City's Central Core (primarily along Broadway, Grant, 22nd, Speedway — streets with bus rapid transit or planned streetcar extensions).

IID
Downtown Area Infill Incentive District
SPEC
c§UDC Art. 5.12, with sub-district definitions in §5.12.9

Defined downtown area (roughly bounded by the Santa Cruz River, 6th St, Stone Ave, and 22nd St) with designated sub-districts per §5.12.9.

UOD
Urban Overlay District
SPEC
c§UDC Art. 5.13, with waiver procedure §5.13.10

Floating overlay — established by petition and Council action for specific areas needing customized urban-form standards.

MHZ
Middle Housing Zone (HB 2721 Compliance)
SPEC
Tucson Code Ordinance adopted August 2025 implementing A.R.S. §9-461.18 / HB 2721 (2024)

Defined geography within Tucson where middle-housing use is permitted by-right in SF and some commercial zones; ordinance specifies mapped eligible parcels per HB 2721 mandate for cities ≥70,000 population.

FP_WASH
Floodplain & WASH (Watercourse, Amenities, Stormwater, Habitat) Regulations
SPEC
Tucson Code Chapter 25 (Floodplain) and Chapter 29 (WASH) — codified SEPARATELY from the UDC

FEMA-mapped Special Flood Hazard Areas (SFHA) under Chapter 25; Pima County / City-mapped washes, riparian habitat, and buffer zones under Chapter 29 (WASH). Tucson's braided arroyo network means substantial portions of the city intersect WASH.

State preemptions

AZ HB 2720 — Middle Housing By-Right in Single-Family Zones (2024)applies
Qualifying condition
Tucson population ≥ 30,000 (actual ≈ 545,000 per US Census 2023 vintage estimate; 542,629 per 2020 Decennial Census); not tribal land. Qualifies for both phased tiers (30k-70k duplex floor AND ≥70k duplex/triplex/fourplex floor). | applies_to=base_districts[category=residential_sf] majority zones within non-exempt geography ; local_status=COMPLIANT — Tucson adopted the Middle Housing Zone (MHZ) ordinance in August 2025 as the HB 2721/HB 2720 compliance mechanism. AEZ / DMAFB AICUZ carve-out preserved — middle housing not permitted where it would violate Part 77 or >65 dB DNL compatibility.
Effect
Tucson must allow duplex/triplex/fourplex as-of-right in the majority of its single-family zones. Cannot impose discretionary review. Cannot impose design standards that effectively prohibit middle housing. Applies to R-1, R-2, R-3, MH-1, MH-2, and some commercial zones where middle housing is proposed.
AZ HB 2721 — Minimum Lot Size Reductions (2024)applies
Qualifying condition
Tucson population ≥ 70,000 (actual ≈ 545,000); not tribal land. Qualifies. | applies_to=base_districts[category=residential_sf] majority zones ; local_status=COMPLIANT via MHZ overlay — the Aug 2025 Middle Housing Zone ordinance reduces effective lot minimums to 5,000 sf within mapped MHZ geography.
Effect
Tucson must permit SF lots with minimum lot size no larger than 5,000 sf in the majority of SF zones, and minimum lot width no larger than 50 ft. This is the HB 2721 companion to HB 2720's middle-housing floor. R-2 (5,000 sf) and R-3 (5,000 sf) already comply at the district level; RH (180,000), SR (144,000), SH/RX-1 (36,000), and RX-2 (16,000) do not meet the 5,000 sf floor at the straight-SF level but Tucson's MHZ overlay effectively implements the floor by permitting middle-housing splits inside larger-lot zones.
AZ HB 2297 — Accessory Dwelling Units By-Right (2024)applies
Qualifying condition
Tucson population ≥ 75,000 (actual ≈ 545,000); not tribal land. Qualifies. | applies_to=base_districts[category in {residential_sf, residential_mf, mixed_use}] ; local_status=COMPLIANT — Tucson UDC ADU provisions aligned with state floor. Residual local restrictions must not exceed HB 2297 floor. AEZ carve-out applies in high-noise AICUZ near DMAFB.
Effect
ADUs permitted by-right on residential and mixed-use lots; 1 attached + 1 detached per eligible lot. Cannot require owner-occupancy; cannot impose minimum lot size beyond underlying zone; cannot charge impact fees exceeding proportional share. Minimum 5 ft setback floor (state) — city cannot tighten.
AZ HB 2110 — Commercial-to-Residential Adaptive Reuse (2024)applies
Qualifying condition
Tucson is not on tribal land; has commercial and mixed-use zones (C-1, C-2, C-3, O-1/2/3, OCR-1, OCR-2) subject to the mandate. | applies_to=base_districts[category in {commercial, office, mixed_use}] ; local_status=Tucson administers adaptive-reuse conversions administratively. Implementation article not explicitly located within UDC as a standalone section — compliance is embedded in procedural review rather than a dedicated overlay. Confirm implementing section in next freshness pass.
Effect
Ministerial approval pathway for conversion of existing commercial/office buildings to residential use; no public hearing required. Adds multifamily_residential to the allowed-uses list for qualifying C/MU/O parcels.
AZ Proposition 207 — Private Property Rights Protection Act (2006)applies
Qualifying condition
Statewide — all AZ cities. Not a zoning preemption per se; creates a compensation requirement where regulation reduces property value. | applies_to=city-wide regulatory framework; no field-level preemption ; local_status=Tucson follows statewide practice of avoiding downzoning. No major documented Prop 207 claims in current research pass. Framework effect noted in quirks.
Effect
Chilling effect on downzoning and new restrictive overlay adoption. Tucson has managed this primarily by layering permissive overlays (IID, CCT, MHZ) rather than downzoning existing districts.
Federal — Davis-Monthan AFB AICUZ + MAAMF (Military Airport Preservation)applies
Qualifying condition
Tucson has direct adjacency to Davis-Monthan Air Force Base (DMAFB) — an active USAF installation in southeast Tucson with A-10 / HH-60 / EC-130 operations and the AMARG 'Boneyard' aircraft storage facility. AICUZ noise contours (DNL 65, 70, 75, 80 dB) extend across substantial areas of south and southeast Tucson. Arizona MAAMF (Military Airport Preservation — state and federal overlay combined in federal-overlays/MAAMF.json) triggers on has_dm_afb_adjacency = true for Tucson. | applies_to=base_districts[*] within mapped AEZ geography; overlay AEZ (Art. 5.6) is the local implementation vehicle ; local_status=Tucson AEZ (UDC Art. 5.6) is the primary local implementation. DMAFB and KTUS generate concurrent AEZ coverage for overlapping portions of the city. Tucson's Middle Housing Zone ordinance (Aug 2025) preserves the federal ceiling by carving out AEZ conflict parcels from HB 2720/2721 by-right housing. Confirm current AICUZ contour extents directly with DMAFB Installation Planning (66 FSS / 355th Wing).
Effect
FEDERAL PREEMPTION of otherwise-applicable state and local standards where they conflict. AICUZ imposes parcel-specific height ceilings (Part 77 imaginary surfaces) and noise-sensitive-use restrictions (residential prohibited or conditioned in high-DNL zones). MAAMF adds state-layered provisions protecting the installation. For HB 2720/2721 middle-housing mandate, the AEZ / AICUZ restricts residential intensification on affected parcels — MHZ ordinance explicitly exempts Part 77 / >65 dB DNL parcels. This is a structural federal-state conflict analogous to the Glendale × Luke AFB MAAMF × HB 2720 pattern.
Federal — Tucson International Airport (KTUS) Part 77applies
Qualifying condition
Tucson International Airport (KTUS) is a commercial civil airport at the south end of the city. FAA Part 77 imaginary surfaces (primary, horizontal, conical, approach, transitional) generate parcel-specific height ceilings across the approach cones and adjacent parcels. | applies_to=base_districts[*] within mapped AEZ geography for KTUS ; local_status=Tucson AEZ (UDC Art. 5.6) jointly implements KTUS and DMAFB federal ceilings. KTUS AEZ covers south/southwest Tucson; DMAFB AEZ covers south/southeast Tucson; combined AEZ footprint is substantial.
Effect
Federal Part 77 height restrictions preempt city-zoned max_height_ft where more restrictive. Noise-compatibility standards (FAR Part 150) govern residential development in KTUS noise-impact area.

Adopted building codes

No statewide code; city-level

IBC
Local adoption
IRC
Local adoption
NEC
2017
IFC
Local adoption
IECC (Residential)
Local
IECC (Commercial)
Local

Click a code label to open its state-by-state adoption atlas.

Quirks & notes

  • Two parallel zoning codes operate simultaneously in Tucson — the legacy Land Use Code (LUC, Chapter 23) continues to govern parcels zoned under that system, while the newer Unified Development Code (UDC, Chapter 23B) governs parcels rezoned since UDC adoption (2013). Both remain active. A parcel-level zoning analysis must first determine which code applies before any dimensional lookup. — [Tucson Code Chapter 23 (LUC) and Chapter 23B (UDC); Tucson Planning & Development Services practice]
  • Height-based perimeter yards — interior setbacks in Tucson are not fixed in feet but are expressed as the GREATER of a minimum value or a multiple of building height (e.g., 6' or 2/3(H) residential-adjacent; 10' or 3/4(H) nonresidential-adjacent). Taller buildings generate larger required yards. This is a structural difference from typical fixed-dimension setbacks and materially affects massing studies in R-2/R-3/OCR-1/OCR-2. — [c§UDC Art. 6.3.4]
  • Two-track street setbacks — street perimeter yards operate on an Established Area versus Developing Area (MS&R) track. Established Area front yards = greater of 20 ft or 1.5(H). Developing Area front yards = determined by MS&R map centerline offset. This creates dynamic setback requirements depending on how an area is classified. — [c§UDC Art. 6.3.4; Art. 5.4 (MSR)]
  • Floodplain (Ch. 25) and WASH (Ch. 29 — Watercourse, Amenities, Stormwater, Habitat) regulations are codified SEPARATELY from the zoning UDC. Unlike most cities, Tucson's flood and riparian rules sit in standalone Tucson Code chapters, not as an overlay in the zoning code. The UDC references them but they must be consulted independently and can materially constrain buildable area in wash-intersecting parcels. — [Tucson Code Ch. 25 (Floodplain) and Ch. 29 (WASH); UDC §9-1 cross-reference]
  • Dual-airport AEZ coverage — both Tucson International Airport (KTUS) and Davis-Monthan Air Force Base (DMAFB) generate Airport Environs Zones under UDC §5.6, meaning parts of Tucson's urban fabric sit under TWO concurrent airport-related overlays. Combined coverage spans south and southeast Tucson including residential, commercial, and some industrial areas. DMAFB additionally triggers the federal MAAMF/AICUZ overlay with use and intensity restrictions that federally preempt state HB 2720/2721 mandates on affected parcels. — [c§UDC Art. 5.6 (AEZ); federal-overlays/MAAMF.json; federal-overlays/AICUZ.json; federal-overlays/PART77.json]
  • Middle Housing Zone (Aug 2025) — Tucson's HB 2721 compliance ordinance modifies permitted uses in R-1 through MH-2 and several commercial zones within a defined mapped geography. Dimensional standards for middle-housing use in those zones differ from SF-use dimensional standards in the same zone. The ordinance explicitly preserves DMAFB / KTUS AEZ compatibility — middle housing NOT permitted where it would violate Part 77 or >65 dB DNL carve-outs. — [Tucson Code — Middle Housing Zone ordinance, adopted August 2025]
  • OCR-2 permits up to 300 ft in height — one of the highest district maxes in the Mountain West — but this is heavily constrained in practice by AEZ / Part 77 surfaces on south- and downtown-adjacent parcels near KTUS. OCR-2 parcels in the downtown IID sub-district may not be able to actually reach 300 ft due to federal airspace ceilings. — [c§UDC Art. 6, Table 6.3-3.C; Art. 5.6 AEZ]
  • Prop 207 (2006) statewide creates a chilling effect on downzoning and new restrictive overlays. Tucson has managed this primarily by layering permissive overlays (IID, CCT, MHZ) rather than downzoning existing districts. No major Prop 207 claims documented in current research pass. — [A.R.S. §§12-1131 to 12-1138 (Prop 207, 2006); Tucson zoning amendment history]
  • Neighborhood Commercial (NC) has a 16 ft height cap — among the most restrictive in the UDC. Intentional neighborhood-scale limit designed to preserve walkable small-format commercial character in established neighborhoods. — [c§UDC Art. 6, Table 6.3-3.B]
  • Tucson's AMARG 'Boneyard' at DMAFB is the world's largest military aircraft storage and maintenance facility. Its presence reinforces DMAFB's strategic long-term status — AICUZ contours are unlikely to contract and federal preemption is durable. — [DoD AMARG facility documentation; DMAFB AICUZ study]

Formulas

Definitions

height
Grade to highest point of structure; measured per UDC §6.4.5
lot_coverage
Building footprint / lot area
far
Gross floor area / lot area
du_ac
Dwelling units per gross acre
setback_front
Front (street) property line to nearest building face; two tracks — Established Area = greater of fixed minimum or 1.5(H); Developing Area = determined by Major Streets & Routes (MS&R) map centerline offset
setback_side
Side property line to nearest building face; interior setback = greater of fixed minimum or 2/3(H) [residential adjacency] or 3/4(H) [nonresidential adjacency]
setback_rear
Rear property line to nearest building face; greater of fixed minimum or height multiple
parking
Use-specific ratios per UDC §7.4; not modeled as per-unit in base district table
height_based_yard_rule
Tucson interior setbacks are expressed as the GREATER of a fixed minimum OR a multiple of building height (2/3H residential-adjacent, 3/4H nonresidential-adjacent). This means taller buildings generate larger required yards, unusual compared to typical fixed-dimension setbacks.

Capacity calculations

max_footprint_sf
lot_area_sf * lot_coverage
max_gfa_sf
lot_area_sf * far
buildable_width_ft_residential
lot_width_ft - 2 * max(side_min_ft, (2/3) * proposed_height_ft)
buildable_depth_ft_residential
lot_depth_ft - max(front_min_ft, 1.5 * proposed_height_ft) - max(rear_min_ft, (2/3) * proposed_height_ft)
max_stories_approx
max_height_ft / 10

Massing explorer

Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.

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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Primary source
Unified Development Code (UDC), Tucson Code Chapter 23B
Chapter 23B UDC running concurrent with legacy Land Use Code (LUC) Chapter 23; both codes remain active depending on parcel zoning classification; Middle Housing Zone amendment adopted Aug 2025 implements AZ HB 2721 compliance · retrieved 2026-04-19
Citations
  1. [1] c§UDC Art. 6.3.4 — perimeter yards; street yard rule applies (greater of 20 ft or 1.5(H) in Established Area)
  2. [2] c§UDC Art. 6.3.4
  3. [3] c§UDC Art. 6.3.4
  4. [4] c§UDC Art. 6, Table 6.3-2.A (per PDSD Dimensional Standards Summary July 2020)
  5. [5] c§UDC Art. 6, Table 6.3-2.A
  6. [6] c§UDC Art. 6, Table 6.3-2.A
  7. [7] c§UDC Art. 6
  8. [8] c§UDC Art. 6
  9. [9] c§UDC Art. 6.3.4
  10. [10] c§UDC Art. 6.3.4
  11. [11] c§UDC Art. 6.3.4
  12. [12] c§UDC Art. 6, Table 6.3-2.A
  13. [13] c§UDC Art. 6, Table 6.3-2.A
  14. [14] c§UDC Art. 6, Table 6.3-2.A
  15. [15] c§UDC Art. 6
  16. [16] c§UDC Art. 6
  17. [17] c§UDC Art. 6.3.4
  18. [18] c§UDC Art. 6.3.4
  19. [19] c§UDC Art. 6.3.4
  20. [20] c§UDC Art. 6, Table 6.3-2.A
  21. [21] c§UDC Art. 6, Table 6.3-2.A
  22. [22] c§UDC Art. 6, Table 6.3-2.A
  23. [23] c§UDC Art. 6
  24. [24] c§UDC Art. 6
  25. [25] c§UDC Art. 6.3.4
  26. [26] c§UDC Art. 6.3.4
  27. [27] c§UDC Art. 6.3.4
  28. [28] c§UDC Art. 6, Table 6.3-2.A
  29. [29] c§UDC Art. 6, Table 6.3-2.A
  30. [30] c§UDC Art. 6, Table 6.3-2.A
  31. [31] c§UDC Art. 6
  32. [32] c§UDC Art. 6
  33. [33] c§UDC Art. 6.3.4
  34. [34] c§UDC Art. 6.3.4
  35. [35] c§UDC Art. 6.3.4
  36. [36] c§UDC Art. 6, Table 6.3-2.A
  37. [37] c§UDC Art. 6, Table 6.3-2.A
  38. [38] c§UDC Art. 6, Table 6.3-2.A
  39. [39] c§UDC Art. 6
  40. [40] c§UDC Art. 6
  41. [41] c§UDC Art. 6.3.4
  42. [42] c§UDC Art. 6.3.4
  43. [43] c§UDC Art. 6.3.4
  44. [44] c§UDC Art. 6, Table 6.3-2.B (SF use)
  45. [45] c§UDC Art. 6, Table 6.3-2.B
  46. [46] c§UDC Art. 6, Table 6.3-2.B
  47. [47] c§UDC Art. 6
  48. [48] c§UDC Art. 6, Table 6.3-2.B (SF use cap)
  49. [49] c§UDC Art. 6.3.4
  50. [50] c§UDC Art. 6.3.4
  51. [51] c§UDC Art. 6.3.4
  52. [52] c§UDC Art. 6, Table 6.3-2.B (SF); 7,000 sf for mobile-home use
  53. [53] c§UDC Art. 6, Table 6.3-2.B (SF)
  54. [54] c§UDC Art. 6, Table 6.3-2.B
  55. [55] c§UDC Art. 6
  56. [56] c§UDC Art. 6, Table 6.3-2.B (MF / MH-park); 8 du/ac SF use
  57. [57] c§UDC Art. 6.3.4
  58. [58] c§UDC Art. 6.3.4
  59. [59] c§UDC Art. 6.3.4
  60. [60] c§UDC Art. 6, Table 6.3-2.B
  61. [61] c§UDC Art. 6, Table 6.3-2.B (SF/civic); 40 ft for nonres
  62. [62] c§UDC Art. 6, Table 6.3-2.B
  63. [63] c§UDC Art. 6
  64. [64] c§UDC Art. 6, Table 6.3-2.B
  65. [65] c§UDC Art. 6.3.4
  66. [66] c§UDC Art. 6.3.4
  67. [67] c§UDC Art. 6.3.4
  68. [68] c§UDC Art. 6, Table 6.3-2.B
  69. [69] c§UDC Art. 6, Table 6.3-2.B
  70. [70] c§UDC Art. 6, Table 6.3-2.B
  71. [71] c§UDC Art. 6
  72. [72] c§UDC Art. 6, Table 6.3-2.B
  73. [73] c§UDC Art. 6.3.4
  74. [74] c§UDC Art. 6.3.4
  75. [75] c§UDC Art. 6.3.4
  76. [76] c§UDC Art. 6, Table 6.3-2.B
  77. [77] c§UDC Art. 6, Table 6.3-2.B (MF)
  78. [78] c§UDC Art. 6, Table 6.3-2.B
  79. [79] c§UDC Art. 6
  80. [80] c§UDC Art. 6, Table 6.3-2.B (MF/MH park)
  81. [81] c§UDC Art. 6.3.4
  82. [82] c§UDC Art. 6.3.4
  83. [83] c§UDC Art. 6.3.4
  84. [84] c§UDC Art. 6, Table 6.3-3.A
  85. [85] c§UDC Art. 6, Table 6.3-3.A
  86. [86] c§UDC Art. 6
  87. [87] c§UDC Art. 6
  88. [88] c§UDC Art. 6
  89. [89] c§UDC Art. 6.3.4
  90. [90] c§UDC Art. 6.3.4
  91. [91] c§UDC Art. 6.3.4
  92. [92] c§UDC Art. 6, Table 6.3-3.A
  93. [93] c§UDC Art. 6, Table 6.3-3.A
  94. [94] c§UDC Art. 6
  95. [95] c§UDC Art. 6
  96. [96] c§UDC Art. 6
  97. [97] c§UDC Art. 6.3.4
  98. [98] c§UDC Art. 6.3.4
  99. [99] c§UDC Art. 6.3.4
  100. [100] c§UDC Art. 6, Table 6.3-3.A
  101. [101] c§UDC Art. 6, Table 6.3-3.A
  102. [102] c§UDC Art. 6
  103. [103] c§UDC Art. 6
  104. [104] c§UDC Art. 6
  105. [105] c§UDC Art. 6.3.4
  106. [106] c§UDC Art. 6.3.4
  107. [107] c§UDC Art. 6.3.4
  108. [108] c§UDC Art. 6, Table 6.3-3.B
  109. [109] c§UDC Art. 6, Table 6.3-3.B
  110. [110] c§UDC Art. 6
  111. [111] c§UDC Art. 6
  112. [112] c§UDC Art. 6
  113. [113] c§UDC Art. 6.3.4
  114. [114] c§UDC Art. 6.3.4
  115. [115] c§UDC Art. 6.3.4
  116. [116] c§UDC Art. 6, Table 6.3-3.B
  117. [117] c§UDC Art. 6, Table 6.3-3.B
  118. [118] c§UDC Art. 6
  119. [119] c§UDC Art. 6
  120. [120] c§UDC Art. 6
  121. [121] c§UDC Art. 6.3.4
  122. [122] c§UDC Art. 6.3.4
  123. [123] c§UDC Art. 6.3.4
  124. [124] c§UDC Art. 6, Table 6.3-3.B
  125. [125] c§UDC Art. 6, Table 6.3-3.B
  126. [126] c§UDC Art. 6
  127. [127] c§UDC Art. 6
  128. [128] c§UDC Art. 6
  129. [129] c§UDC Art. 6.3.4
  130. [130] c§UDC Art. 6.3.4
  131. [131] c§UDC Art. 6.3.4
  132. [132] c§UDC Art. 6, Table 6.3-3.C
  133. [133] c§UDC Art. 6, Table 6.3-3.C
  134. [134] c§UDC Art. 6, Table 6.3-3.C
  135. [135] c§UDC Art. 6
  136. [136] c§UDC Art. 6
  137. [137] c§UDC Art. 6.3.4
  138. [138] c§UDC Art. 6.3.4
  139. [139] c§UDC Art. 6.3.4
  140. [140] c§UDC Art. 6, Table 6.3-3.C
  141. [141] c§UDC Art. 6, Table 6.3-3.C
  142. [142] c§UDC Art. 6, Table 6.3-3.C
  143. [143] c§UDC Art. 6
  144. [144] c§UDC Art. 6
  145. [145] c§UDC Art. 6.3.4
  146. [146] c§UDC Art. 6.3.4
  147. [147] c§UDC Art. 6.3.4
  148. [148] c§UDC Art. 6, Table 6.3-3.B
  149. [149] c§UDC Art. 6, Table 6.3-3.B
  150. [150] c§UDC Art. 6
  151. [151] c§UDC Art. 6
  152. [152] c§UDC Art. 6.3.4
  153. [153] c§UDC Art. 6.3.4
  154. [154] c§UDC Art. 6.3.4
  155. [155] c§UDC Art. 6, Table 6.3-4
  156. [156] c§UDC Art. 6, Table 6.3-4
  157. [157] c§UDC Art. 6
  158. [158] c§UDC Art. 6
  159. [159] c§UDC Art. 6.3.4
  160. [160] c§UDC Art. 6.3.4
  161. [161] c§UDC Art. 6.3.4
  162. [162] c§UDC Art. 6, Table 6.3-4
  163. [163] c§UDC Art. 6, Table 6.3-4
  164. [164] c§UDC Art. 6
  165. [165] c§UDC Art. 6
  166. [166] c§UDC Art. 6.3.4
  167. [167] c§UDC Art. 6.3.4
  168. [168] c§UDC Art. 6.3.4
  169. [169] c§UDC Art. 6, Table 6.3-4
  170. [170] c§UDC Art. 6, Table 6.3-4
  171. [171] c§UDC Art. 6
  172. [172] c§UDC Art. 6

Research status

Publication gates

primary url presentpassedsource.primary_url = https://codelibrary.amlegal.com/codes/tucson/latest/tucson_az_udc/ present, https, resolves to Tucson UDC Chapter 23B on amlegal platform.
no aggregator citedpassedNo zoneomics / steadily / siteplanguide / siteplancreator references anywhere in record. All citations point to UDC Chapter 23B (c§UDC Art. X.Y), Tucson Code Chapters 25/29, AZ session laws (HB 2720/2721/2297/2110, Prop 207), federal overlays (MAAMF/AICUZ/Part 77), or the Tucson PDSD Dimensional Standards Summary July 2020.
confidence tags full formpassedAll confirmed/partial claims carry explicit {status, citation, reason|search_performed|note} structure with c§UDC Art. X.Y section citations where applicable. Bare [confirmed] tags eliminated. Every overlay has status + citation.
overlays have parameters trigger confidencepassedAll 14 overlays (HDZ, SCZ, MSR, GCZ, AEZ, ERZ, HPZ_HL, DSO, NPZ, CCT, IID, UOD, MHZ, FP_WASH) have non-empty parameters[] arrays (5-7 entries each), populated geographic_trigger, status ∈ {confirmed, partial}, and citation. Primary Gate 4 failure mode from v1 resolved — v1 had loose params dicts with some missing trigger/status; v2 normalizes all 14.
preempt section city specificpassedstate_preemptions_applicable[] contains 7 city-specific entries (HB 2720, HB 2721, HB 2297, HB 2110, Prop 207, federal DMAFB AICUZ/MAAMF, federal KTUS Part 77) each with qualifying_condition_checked (carrying population arithmetic ~545k against the 30k/70k/75k thresholds with 2020 Decennial + 2023 PEP vintages), effect, effective_date, local_status, and citation. Record does NOT link-stub to arizona.md. Federal DMAFB + KTUS overlays promoted to explicit federal_state_conflict entries with federal_overlay_refs populated — resolves the FM-P concern about mis-tagging federal overlays as state preemption.

Known issues

freshness:volatile

Verification

last_verified_at2026-04-19T08:10:00Z
verifier_specialistverification-pass
verifier_version1.0
verification_resultpassed_with_partials
atomic_claims_checked71
atomic_claims_confirmed34
atomic_claims_partial32
atomic_claims_not_found5
failed_claims
notesFormat-transformation pass: v1 data (PDSD Dimensional Standards Summary July 2020 + UDC Article 5 TOC extraction) carried forward with normalized {status, citation} structure. High-confidence claims: base-district min-lot-sf and max-height-ft values (from confirmed summary PDF); AEZ structure (dual-airport KTUS + DMAFB); MHZ Aug 2025 adoption. Partial claims: overlay numerical parameters (amlegal 403 prevented full Article 5 text retrieval); full parking ratio tables (deferred to UDC §7.4 use-based lookup). Not-found: parking ratios across all districts (search_performed: UDC §7.4); specific GCZ and DSO parameters (search_performed: UDC §5.5 and §5.9 via amlegal).

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