Managing a Small Apartment Building in San Diego (2 to 20 Units)

Reviewed by Brendan McKee, Managing Broker, DRE #01882732, on October 21, 2026.

A small apartment building in San Diego, from a duplex to about 20 units, is managed under stricter rules than a single-family rental because the single-family exemptions do not apply. Unless the building is an owner-occupied duplex or received its certificate of occupancy within the past 15 years, expect the AB 1482 rent cap statewide and just-cause rules from the first day of a tenancy in the City of San Diego. On top of that come building duties: the City's Rental Unit Business Tax by unit count, SB 721 balcony inspections for buildings with three or more units, alarms in every unit, and shared common areas, meters and trash service.

This is general information, not legal or tax advice. Confirm the details for your situation with a California attorney or tax professional. Rules are stated as of October 2026.

Key takeaways

• Multi-unit buildings cannot use the single-family or condo exemption. The main exemptions left are an owner-occupied duplex (neither unit an ADU or JADU) and a certificate of occupancy within the previous 15 years.
• In the City of San Diego, the Tenant Protections Ordinance requires just cause from the start of a tenancy and two months' rent in relocation (three for tenants 62+ or disabled) on no-fault terminations.
• Chula Vista treats three or more units owned by the same owner as a "residential rental complex" with higher relocation; Imperial Beach's complex threshold is 15 units.
• City business tax: $50 plus $5 per unit for 2 to 10 units; $57 plus $9 per unit for 11 to 100 units; plus a $4 state fee.
• The first SB 721 inspection deadline for covered buildings was January 1, 2026, and inspections repeat every six years.
• AB 1482 allows increases of up to 8.2% in San Diego County from August 1, 2026, and, as of October 2026, Penal Code § 396 generally limits rent to 10% above pre-emergency levels (stated through November 14, 2026 unless extended).

Tenant protections by location

The same building can face different rules depending on the city it sits in.

Exemptions for multi-unit owners are narrow. The City and state both exempt an owner-occupied duplex while the owner lives there (SDMC § 98.0703(j); Civ. Code § 1946.2(e)(6)), and housing issued a certificate of occupancy within the previous 15 years (SDMC § 98.0703(k); Civ. Code §§ 1946.2(e)(7), 1947.12(d)(4)). A triplex or fourplex owner who lives in one unit does not get the duplex exemption. The San Diego Tenant Protections Ordinance guide and ending a tenancy in San Diego explain notices and relocation in detail.

The City business tax for multi-unit buildings

The City of San Diego's Rental Unit Business Tax applies to anyone who owns, operates or manages residential rentals, generally due March 1. The current posted schedule:

Add the $4 state disability-access fee. On that schedule, a fourplex comes to $50 plus $20, plus $4. A late payment costs the greater of $25 or 10% of the tax due, plus 1% a month, and the Treasurer bills back up to three years. Other cities in the county set their own business license rules. The Rental Unit Business Tax guide covers exemptions and contacts.

Building safety duties

Balconies, decks and stairways (SB 721)

Health and Safety Code § 17973 requires inspection of exterior elevated elements in "all buildings containing three or more multifamily dwelling units." Covered elements are balconies, decks, porches, stairways, walkways and entry structures more than six feet above ground that rely in whole or in substantial part on wood for support. Key points:

• The first inspection was due January 1, 2026, and then every six years. Buildings permitted on or after January 1, 2019 must be inspected within six years of the certificate of occupancy.
• The owner hires a qualified inspector (an architect, a civil or structural engineer, a qualifying contractor, or a certified building inspector).
• Non-emergency repairs: apply for a permit within 120 days of the report, then complete repairs within 120 days of permit approval. An emergency condition requires immediate steps, such as blocking access.
• Unfinished repairs can lead to civil penalties of $100 to $500 a day and a building safety lien.
• Condos and other common interest developments are excluded; their associations follow Civ. Code § 5551.

The balcony and deck inspection guide walks through the report and repair steps.

Alarms, fixtures and lead

• Smoke alarms: the owner of a rented apartment or multi-unit building tests and maintains them, and they must work when a new tenancy begins (H&S § 13113.7).
• Carbon monoxide devices: required in each unit with a fossil-fuel heater or appliance, a fireplace or an attached garage (H&S § 17926). See smoke and carbon monoxide alarms.
• Water-conserving fixtures: multifamily buildings had to comply by January 1, 2019, and fixtures must work at rated consumption when a tenant takes possession (Civ. Code § 1101.5).
• Lead: pre-1978 buildings need the federal lead disclosure and pamphlet with each lease.

Common areas, meters, trash and building services

Build these into your lease and routine:

• Shared meters. If a tenant's gas or electric meter serves areas outside their unit, such as hallway lights or a laundry room, Civ. Code § 1940.9 requires disclosure before the tenancy and a written agreement on payment.
• Laundry and common rooms. Put hours, care and reporting steps in the house rules.
• Trash. The City of San Diego's trash fee applies to property owners who receive City service and is billed on the property tax bill. Larger multifamily properties may need a private hauler, so check your parcel on the City's eligibility lookup by APN.
• Bulk internet. For tenancies begun, renewed or continuing month-to-month on or after January 1, 2026, tenants must be allowed to opt out of paying for a landlord-arranged internet subscription (Civ. Code § 1942.8).
• Rent reporting. Landlords must offer tenants positive rent reporting (Civ. Code § 1954.07). A building with 15 or fewer units is exempt unless the owner owns more than one residential rental building and is a REIT, a corporation or an LLC with a corporate member.
• Resident manager. The DRE license law does not apply to the resident manager of an apartment building or that manager's employees (B&P § 10131.01(a)(1)). Anyone managing for you off site for pay needs a broker license.

If the building has ground-floor shops or offices, the commercial space follows different rules; see commercial and mixed-use property management in San Diego and our commercial property management page.

Rent rolls, increases and staggered turnover

A clear rent roll is what keeps a multi-unit building within the cap. For each unit, track the current rent, the lowest rent charged in the prior 12 months, the date and size of each increase, the deposit held, and the lease end date.

• The cap. Under Civ. Code § 1947.12, increases over any 12 months may not exceed 5% plus the San Diego CPI change, or 10%, whichever is lower: 8.2% for increases from August 1, 2026 through July 31, 2027 in San Diego County. The base is the lowest rent in the prior 12 months, and at most two increases are allowed in 12 months. The rent increase calculator does the math.
• Notice. 30 days for an increase of 10% or less, 90 days for more (Civ. Code § 827).
• Emergency limit. As of October 2026, San Diego County is under a state of emergency for Tropical Storm Rachel, so Penal Code § 396 generally bars advertising, offering or charging rent more than 10% above the pre-emergency amount, including at turnover. It is stated through November 14, 2026; check whether it has been extended.
• Deposits. Generally one month's rent. The two-month small-landlord exception covers only natural persons (or LLCs of natural persons) with no more than two rental properties and four units in total, so most owners of a five-unit or larger building cannot use it.
• Staggered lease ends. Spreading lease expirations across the year avoids several vacancies at once.

See rent increases in San Diego for the full notice rules, and our San Diego property management page for how a manager handles the rent roll.

Frequently asked questions

Is my San Diego fourplex exempt from the rent cap?

Usually not. The single-family and condo exemption does not apply to a building with several units on one parcel, and the owner-occupied exemption covers only a duplex. A fourplex can be exempt if it was issued a certificate of occupancy within the previous 15 years; otherwise the AB 1482 cap of 8.2% (for increases from August 1, 2026) applies.

Does SB 721 apply to my small apartment building?

It applies to buildings with three or more multifamily units that have balconies, decks, stairways or walkways more than six feet above ground relying substantially on wood for support (H&S § 17973). The first inspection was due January 1, 2026, then every six years. A duplex, or a building whose elevated elements are concrete or steel, is outside the definition.

How much is the San Diego rental business tax for an apartment building?

On the City of San Diego's current posted schedule, a building with 2 to 10 units pays $50 plus $5 per unit, and 11 to 100 units pays $57 plus $9 per unit, plus a $4 state fee. It is generally due March 1, and the City can bill back up to three years with late fees.

Do I need a license to have someone manage my building?

Anyone who leases units or collects rent for you for compensation needs a California DRE broker license (B&P § 10131(b)). The law exempts a resident manager of an apartment building and that manager's employees. As the owner, you can manage your own building without a license.

What relocation do I owe for a no-fault termination in a San Diego apartment?

In the City of San Diego, two months of the tenant's current rent, or three months if the tenant is 62 or older or disabled, paid within 15 days of the notice or as a rent waiver (SDMC § 98.0706). In Chula Vista, buildings of three or more units owe more, and that amount is not credited against state relocation.

Next step: get a building-level rent check

A rent roll review shows where each unit sits against the market and the cap. McKee Properties has managed San Diego rentals since 1982 and offers a free San Diego rental analysis with no obligation.