Short-Term Rental Regulations Across the Western US: 13-Market Investor Map

STR regulation in the Western US clusters around three state-level patterns: California's primary-residence-only ordinances (LA, SF) plus structured tier systems (San Diego), Arizona's state preemption that limits city restrictions (Phoenix, Scottsdale, Sedona), and Hawaii's 30-day-minimum across most Oahu/Maui residential zones. Colorado's mountain markets (Aspen, Denver) operate under permit-cap or primary-residence frameworks. Nevada (Las Vegas / Clark County) uses geographic separation rules. Utah (Park City) restricts to specific zones. The result: investor strategy is meaningfully different across each Western state.

The Western regulatory pattern map

California's bonus-depreciation non-conformity

California is the major Western state that decouples from federal bonus depreciation for state tax purposes. This affects every California STR market — LA, SF, San Diego, Palm Springs, plus state-level cost-seg studies on California residents owning out-of-state properties. The federal benefit (100% bonus depreciation under OBBBA, applied to 5- and 15-year reclassified assets) is unaffected. The state benefit is reduced — California requires depreciation to track standard MACRS schedules without bonus acceleration, generating an addback on state returns. For high-bracket investors, the federal savings still typically exceed the foregone state benefit by 10-20x. The math: $200K of cost-seg deductions at 37% federal = $74K federal savings; California addback at 13.3% top bracket on the same $200K = ~$26K state-level adjustment. Net benefit: ~$48K positive, still strong, but dramatically reduced versus the Nevada or Texas equivalent ($74K full benefit, no state offset).

Hawaii's 180-day TAT exemption + 30-day rule interaction

Hawaii's STR tax framework distinguishes between 30 days and 180 days. Bill 41 (Oahu) and Bill 9 (Maui) require a 30-day minimum stay outside resort zones — which means most operators outside resort zones are forced into 30+ day MTR territory. But Hawaii's TAT (transient accommodations tax) only exempts 180+ day stays, not 30+ day stays. This creates a 30-179 day window where stays must comply with the 30-day-minimum but still face TAT (~13.25%) plus GET (~4.7%). Operators planning around Hawaii's framework should target either 30-day flat (compliance with minimum, accept TAT) or 180+ day (escape TAT entirely).

Cost segregation strategy for the Western US

Three patterns hold:

1. No-state-income-tax markets (NV, WA) deliver the cleanest cost-seg ROI. Las Vegas in particular: 100% federal bonus depreciation under OBBBA flows through without state-level offset, generating exceptional after-tax returns on properties with strong personal-property + 15-year ratios.
2. California markets require state-level adjustment but remain federally compelling. LA, SF, San Diego, Palm Springs all face California's bonus non-conformity, but the federal benefit alone justifies cost-seg studies for high-bracket operators with suitable property bases.
3. Hawaii's 30-day rule shifts the loophole math. Outside Oahu/Maui resort zones, the 7-day-average-stay test for the STR loophole almost always fails. Investors must qualify for REPS or accept passive-loss treatment. Cost-seg deductions remain valuable but the loss-utilization mechanism changes.

Watchlist: Western regulatory direction

The 2024-2026 trend across the Western US is toward more restrictive STR regulation, with three regional themes: (1) California metros (LA, SF, San Diego) continuing to refine primary-residence and tier-system enforcement; (2) Colorado mountain resorts adding workforce-housing-driven permit caps (Aspen complete, Vail and Breckenridge debating similar measures); (3) Hawaii's Bill 9 / Bill 41 phase-out ongoing through 2025-2027. Investors should expect more, not less, regulation in the medium term.

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