Post-2017 California ADU law unlocked a substantial new cost-seg category for LA SFR holders. Engine-derived numbers for a Sherman Oaks SFR with detached ADU and the depreciation math behind the basis addition.
Before the analysis: the underlying numbers this post draws on come from 5 Los Angeles-area properties run through the Cost Seg Smart engine, same engine that produces real customer studies. Median Year-1 federal savings is $43,063 at the 37% top marginal bracket with 100% bonus depreciation. Reclassification ratio ranges 16.0% to 18.4%.
Los Angeles is the most regulatorily-honest market in our network — and the most misunderstood by out-of-state investors who assume STR-loophole strategies translate from Joshua Tree, Palm Springs, or Tahoe. The City of Los Angeles operates a Home-Sharing Ordinance that restricts most short-term-rental operations to primary residences only, with strict permit and stay-limit requirements. If you're an absentee investor buying an LA property hoping to operate it as an STR with the §469 short-term-rental loophole, the LA municipal code will not support that plan in most cases. There are narrow exemptions, grandfathered properties, and adjacent jurisdictions (West Hollywood, Burbank,...
The remainder of this section drills into the specifics that matter for comparison local data. The five fixtures we ran through the engine for Los Angeles span $985,000 to $1,850,000 in purchase price across 5 distinct sub-markets, enough variance to draw real conclusions about which scenarios actually produce cost-seg ROI in this market.
Take the Silver Lake Bungalow Flip as our anchor example. Purchase price: $1,325,000. Built 1925, 1850 sqft, SFR, located in Silver Lake / Echo Park (Eastside).
The engine determined land allocation of 45.0% using statistical methodology, producing a depreciable basis of $728,750. Of that, the engine reclassified $67,547 into 5-year personal property (FF&E, decorative finishes, certain electrical), $48,839 into 15-year land improvements (paving, landscaping, hardscape, site lighting), and the rest into the 27.5-Year Residential Real Property structural category.
That produces a total reclassification ratio of 16.0%. At 100% bonus depreciation and a 37% federal marginal bracket, the illustrative Year-1 federal tax savings is $43,063. That's the headline number for this fixture.
Contrast that with Highland Park Craftsman + ADU: $1,050,000 in Highland Park / Eagle Rock, built 1922. Here the engine produced a reclassification ratio of 16.0%, higher than the previous example.
Why? Two reasons. First, the land allocation profile is different, 42.7% here versus 45.0% for the previous example. Second, the engine's treatment of sfr interacts with the build-year and FF&E density differently across neighborhoods.
The takeaway: in Los Angeles, the per-fixture variance is real. A median number (16.3% reclass) hides meaningful variation across sub-markets and property archetypes.
California decouples from federal §168(k). The 100% federal bonus depreciation restored by OBBBA in 2025 produces real federal-tax savings, but California requires the deduction to be added back on Schedule CA (540) and the basis depreciated on the regular MACRS schedule for state purposes. For Los Angeles owners in California's top 13.3% bracket, the headline federal-savings number overstates total tax savings — the state-side California acceleration that would have occurred under federal conformity is recovered slowly over the regular 27.5- or 39-year schedule instead.
Decoupling: California's decoupling is permanent and structural. Federal §168(k) at 100% reduces federal liability; California treats the property under the regular MACRS schedule. For LA cost-seg buyers in the top California bracket, model federal-only savings as your Year-1 win.
This affects every cost-seg calculation in Los Angeles. Because California doesn't fully conform, the federal Year-1 figure shown above is only the federal-only portion. The state benefit is smaller (or different) and your CPA will need to manage the addback at filing time.
City of Los Angeles Home-Sharing Ordinance: Short-term rentals (stays under 30 days) are generally restricted to a host's primary residence, with annual cap on hosted-stay nights and registration/permit requirements. Non-primary-residence STR operation is largely prohibited in LA city limits. This is the single most important regulatory fact for cost-seg planning in LA — absentee STR strategies do not translate from Joshua Tree, Palm Springs, Tahoe, or other §469-loophole markets. Adjacent jurisdictions with different regimes: West Hollywood (permits available), Burbank (some areas permit), Pasadena (limited permits). Verify jurisdictional boundaries carefully — addresses on the same block can fall under different regulatory regimes. For non-STR investor strategies (fix-and-flip, small MF, ADU), there is no STR ordinance to manage; standard rental property §469 passive-loss rules apply, and real-estate-professional status is the typical path to active treatment for high-volume LA flippers.
To run this analysis for your specific Los Angeles property: the same engine, with your address, year built, square footage, and renovation history. Studies start at $495 for residential under $300K. Audit defense is included with every Cost Seg Smart study.
For the STR-loophole / W-2 offset side specifically (7-day rule, material participation, REPS-alternative), see costsegw2.com.
To run this analysis for your specific Los Angeles property: the same engine, with your address, year built, square footage, and renovation history. Studies start at $495 for residential under $300K. Audit defense is included with every Cost Seg Smart study.
For the STR-loophole / W-2 offset side specifically (7-day rule, material participation, REPS-alternative), see costsegw2.com.