The Owner Who Already Owns the Dirt

Parts 1 and 2 asked whether California's accessory dwelling unit policy works for the buyer it was written to help. The answer was: barely.

This part runs the identical construction — same garage conversion, same junior unit, same code, same county — for someone who isn't buying anything.

It works. Not marginally. Decisively.

That difference is the argument of this entire series.

Meet the owner

She's 76. She bought the house in Camarillo in 1984 and raised three children in it. Her husband died four years ago. The mortgage is long gone. She lives alone in four bedrooms across two stories and uses roughly a third of it.

Her options, as they're usually presented: sell and move, rent out a room, move in with a child, or stay and maintain a house that's too big. I wrote about that decision in The Downsizing Decision series.

What I left out — because I hadn't worked it through yet — is a fifth option.

She converts the attached garage into a 600-square-foot accessory dwelling unit (an ADU — a self-contained second residence on the same lot) on grade. She carves a 450-square-foot junior accessory dwelling unit (a JADU — 500 square feet or less, created within the walls of the existing house) out of the downstairs bedroom. She adds a half bath and builds a carport.

Then she moves into the ADU and rents the house she raised her family in.

Why the numbers break her way

She isn't buying anything. The entire question from Part 2 — whether the acquisition pencils — simply doesn't exist. She's spending roughly $220,000 against an asset she already owns outright. No down payment, no mortgage insurance, no Federal Housing Administration loan ceiling, no purchase-price debt-to-income test.

Proposition 13 survives. Adding the units triggers assessment of the new construction only, not a reassessment of the existing house. Her 1984 base year value stays intact. A buyer at today's prices pays property tax on today's value. She doesn't.

She's the one who can actually use the depreciation. In Part 2, cost segregation produced roughly $60,000 of accelerated deduction that suspended under Internal Revenue Code Section 469 and sat there. She may be able to use the $25,000 active participation allowance against ordinary income — it phases out above $100,000 of modified adjusted gross income, a threshold that excludes the high-earning buyer and includes her. Same construction, same study, opposite result.

Step-up erases the recapture. She takes depreciation for as long as she lives there. At her death, her heirs receive a stepped-up basis and the depreciation recapture never comes due. She gets the deduction during life and never pays it back. I've written more about that exit in the Next Level Real Estate Investing series.

And the home sale exclusion question may cut her way — because the unit is attached. I've argued that a detached ADU was never covered by the home sale exclusion, because Treasury Regulation Section 1.121-1(e) requires allocating gain when a separate structure is used for non-residential purposes.

A converted attached garage is a different question. The entire structure is arguably one dwelling unit, which would mean no allocation — only depreciation recapture.

I'm not reversing what I wrote. Detached and attached are genuinely different facts under that regulation. This is a question for her certified public accountant, not for me. But it is a direct argument for converting the garage rather than building a cottage in the backyard, and nobody raises it at the permit counter.

The income

The three-bedroom main house at roughly $4,200 and the junior unit at roughly $1,800 produces about $6,000 per month — while she lives on the property with a 1984 property tax bill and no mortgage payment.

What she's actually buying isn't the money

A garage conversion is the only unit in this entire scheme that is inherently single-story.

No stairs. A walk-in shower, a wider doorway, a small footprint she can keep clean — on the same parcel she's been on for forty years, with the same neighbors, the same church, and the same grocery store.

That's the product. The $6,000 is what pays for it.

Two obstacles, and one of them isn't what people assume

The first is real. She needs roughly $220,000 to build it, and the underwriting question is income, not age. Age is a prohibited basis under the Equal Credit Opportunity Act — a lender cannot deny or price credit because she's 76.

The loan isn't serviced by her Social Security. It's serviced by the rent, once the units are finished and occupied by screened, credit-worthy tenants. That's the entire point of building them.

The question is whether a lender will credit income that doesn't exist yet. A straight home equity line of credit won't; it underwrites on income as of today. A renovation or construction-to-permanent loan will, because it underwrites on as-completed value and can count projected rent from an appraiser's rent schedule. The real gap is the construction period — six to nine months of carrying the draw before the first lease starts, which has to be planned for rather than discovered.

That's a conversation with a lender who does renovation lending, not a general mortgage officer.

The second one people raise isn't really an obstacle. They say she'd have to become a landlord at 76.

She doesn't have to become anything. Being a landlord is a profession, and she can hire it — the same way she hires a CPA rather than learning the tax code herself.

She stays the owner of record, which means the fair housing obligation and the Assembly Bill 1482 notice remain hers. What she's buying is that she doesn't have to learn three bodies of law at 76, and that when a tenant has a problem at eight at night, there's a number to call that isn't her front door. Proximity is the real difficulty here. An owner living twenty feet from her tenants has no natural boundary, and goodwill does not create one. A manager is that boundary.

I manage rental property for a living, so weigh that recommendation accordingly. Management on two units at this rent runs roughly $480 to $600 per month. She should see that number before she decides, not after.

The honest risks

Building the ADU may cost her the single-family exemption under Assembly Bill 1482 at certificate of occupancy — that's Part 1 of The ADU Decision, and it applies to her exactly as it applies to the buyer in Part 2.

She takes on habitability obligations, security deposit accounting under California Civil Code Section 1950.5, and screening that cannot create a familial status problem. These are real and they are permanent.

I am not a certified public accountant and this is not tax advice. Every tax position in this article needs a CPA looking at her actual facts.

So — can an accessory dwelling unit work for you?

Here's the comparison that matters, because it's the one she's actually being offered.

A reverse mortgage turns her equity into income by consuming it. She draws against the house, the balance compounds, and her heirs repay it or sell. It's non-recourse, so they can't owe more than the house is worth — but the equity goes. At 76 on a paid-off Camarillo house she might see somewhere around $2,200 to $2,600 per month, and every dollar of it shrinks what she leaves behind. She still pays the taxes, the insurance, and the maintenance, and a lapse on any of those is a default.

The conversion turns her equity into income by producing it. Roughly $6,000 per month gross, the Proposition 13 basis intact, the property worth more than it was, and the whole thing passing to her children with a stepped-up basis.

More income. And the estate grows instead of shrinking.

Which brings this series back to where it started. Three parts, three answers. For the buyer in Part 2, this policy barely works. For her, it beats the product the financial industry has been selling her generation for thirty years.

The difference isn't effort, or intelligence, or planning.

It's that she already owned the land.