Investing in San Diego County property

Does buying a rental property in San Diego actually work?

San Diego is an appreciation market rather than a cash-flow market, and an investor should start from that rather than discover it. A straightforward single-family rental bought at market price with conventional financing rarely covers its own costs here in the early years, because prices are set by owner-occupiers competing on lifestyle rather than by investors competing on yield.

No cap rate is published on this page, because a countywide figure would be meaningless across a market where a Ramona acreage property and a Del Mar condo are not the same asset class in any useful sense. What is worth stating plainly is the structure: the return here has historically come from appreciation, principal paydown and tax treatment more than from monthly income.

The strategies that do produce income in this county generally add something rather than simply buying: an accessory dwelling unit on a lot that allows one, a licensed short-term rental where the rules permit it, or a multi-unit property where the numbers work differently. Each carries its own rulebook, and each is covered below.

Is building an ADU a good investment in San Diego?

An accessory dwelling unit is the most reliable way to add income to a San Diego County property, because it creates a second rentable unit on land already owned and adds permitted square footage that a lender and an appraiser can both count.

Whether a lot allows one is now a parcel-level question rather than a citywide one. The City's standard allowance — one detached ADU, one conversion and one junior ADU on a single-family lot — remains ministerial, but the Bonus ADU Program was narrowed in August 2025 and no longer applies across several RS-1 zones outside High and Highest Resource Areas. Check the zoning before modelling the returns.

Owners in the unincorporated county have an option the city does not offer: since the County adopted AB 1033, an ADU in Fallbrook, Valley Center, Ramona and the rest of the unincorporated area can be converted to a condominium and sold separately, which changes the exit entirely — what the ordinance allows and where it does not apply. What an ADU does to resale value is covered under what actually adds value.

Can I buy a short-term rental in San Diego?

Short-term letting in the City of San Diego requires a license under a capped, tiered ordinance rather than merely a willing property, and the caps mean licenses are not available on demand in the most sought-after areas. An investor buying on short-term income has to confirm license availability before committing, not after.

A license attaches to conditions rather than traveling freely with a sale, so the question at purchase is what can actually be obtained for that property rather than what the previous owner was doing. The tiers, the caps and how the lottery has worked are set out in the short-term rental ordinance.

Attached homes carry a second rulebook on top: an association's governing documents commonly impose minimum lease terms or cap the proportion of units that may be rented at all, which is covered under renting out a San Diego condo. Both have to permit it.

What rules apply to a landlord in San Diego?

A San Diego landlord operates under California's Tenant Protection Act — AB 1482 — which caps annual rent increases and requires a stated just cause to end a tenancy after twelve months, and under the statewide security deposit limit of one month's rent. Most single-family homes and condominiums are exempt from the rent cap and just-cause rules, but only if the exemption is properly noticed.

That exemption is why the rules feel invisible to many small San Diego investors and then suddenly do not. It depends on the type of property, on who owns it — corporate ownership can remove it — and on the required written notice actually having been given. The specifics, including this year's San Diego cap and the deposit rule that works differently for service members, are on the landlord rules page.

How do I sell an investment property without paying tax now?

An investor selling a San Diego County rental can defer the capital gain by rolling the proceeds into another investment property through a 1031 exchange, provided the mechanics are followed exactly — and the single most common way to lose the deferral is taking possession of the money.

The deadlines are unforgiving and they start at closing, which means the exchange has to be set up before the sale completes rather than afterwards. How the timeline and the intermediary requirement work covers what has to be in place and when.

Inherited investment property is a different question with a different answer, because the assessed value and the basis both change on transfer — see Prop 19 and inherited San Diego property.