Multifamily and Duplex Properties for Sale in Imperial Beach: Zoning and Rent Rules

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

In Imperial Beach, duplexes, small apartment buildings and condos are concentrated in the city’s R-1500, R-2000 and R-3000 zones and in the mixed-use zones along Palm Avenue and Seacoast Drive. I found no local rent control ordinance. State law sets the rent cap and the eviction rules, and because the city sits in the Coastal Zone, development usually takes an extra permit step.

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What multifamily in Imperial Beach looks like

The city’s zoning shows what’s out there. Its six residential zones step up from single-family lots of 6,000 and 3,800 sq ft, to two-family and medium-density zones at one unit per 3,000 sq ft, to R-2000 at one unit per 2,000 sq ft, to R-1500, the high-density zone (IBMC zone list). Most rental inventory is duplexes, fourplexes, garden apartments and townhome-style condos on standard lots, plus apartments over storefronts in the mixed-use zones.

Two-to-four-unit buildings can qualify for residential financing (financing 2-4 unit properties). Five or more units, or mixed-use buildings with commercial space, usually need apartment building loans.

Where the zoning allows it

Zone	What the code allows	Density	Height
R-3000-D	Detached homes, one per 3,000 sq ft (several per lot on larger lots)	1 per 3,000 sq ft, max 14 units/net acre	2 stories / 26 ft
R-3000	Medium density or two-family residential	1 per 3,000 sq ft	Check Ch. 19.15
R-2000	Medium density residential	1 per 2,000 sq ft	Check Ch. 19.16
R-1500	Duplexes, apartments, condos, townhomes	1 per 1,500 sq ft, max 29 units/net acre	3 stories / 30 ft
C/MU-1	Multifamily and mixed use; active ground-floor commercial on Palm Avenue	1 per 1,000 sq ft	4 stories / 40 ft
C/MU-2	Multifamily and mixed use near the beach	1 per 1,500 sq ft (1 per 1,210 east of Seacoast Drive with a CUP)	3 stories / 30 ft base
C/MU-3	Neighborhood mixed use	1 per 1,500 sq ft	Check Ch. 19.28

Sources: zone list, R-3000-D, Ch. 19.14, R-1500, Ch. 19.17, C/MU-1, C/MU-2.

The review path depends on size. In R-1500 and R-3000-D, projects of two to four units get site plan review from the community development department, and projects of five or more go to the planning commission. R-1500 also caps floor area ratio at 100% and lot coverage at 50% (IBMC Ch. 19.17). In the mixed-use zones, an all-residential project must meet R-1500 standards.

ADUs and SB 9. State ADU law applies to residential lots in Imperial Beach. SB 9 lot splits and duplexes apply only in single-family zones (here, R-1-6000 and R-1-3800). See our SB 9 lot split guide and ADU investment guide.

Rent rules: state law only

The California Attorney General’s rent cap chart lists no local rent limit for Imperial Beach. For the San Diego area, the statewide cap is 8.8% for increases between August 1, 2025 and July 31, 2026, and 8.2% for increases between August 1, 2026 and July 31, 2027 (AG rent caps). The cap is 5% plus inflation, up to 10%, over any 12 months.

Exempt from the cap: buildings with a certificate of occupancy issued within the last 15 years, single-family homes not owned by a corporation or REIT, and a duplex where the owner lives in the other unit (AG landlord-tenant page). Once a tenant has lived in a covered unit for 12 months, an eviction needs an at-fault or no-fault just cause. See AB 1482 for landlords and just cause eviction.

Imperial Beach rental property rules

Short-term rentals. Short-term rentals are permitted in the C/MU zones and in the Seacoast Mixed-Use/Residential overlay. The overlay runs between Ocean Boulevard and Ocean Lane, from Palm Avenue to Imperial Beach Boulevard (IBMC § 19.27.140). Outside those areas, ask the city before underwriting any nightly income.
Mobile home parks. These need a CUP in R-1500 (IBMC § 19.17.020) and aren’t allowed in the C/MU zones.
Business license. Ask the city whether your rental operation needs a business license (permits and licenses).
I found no rental registration or rental inspection program on the city’s site. Confirm with the city.

Coastal, flood and water-quality issues

Almost every redevelopment in Imperial Beach runs into coastal rules. Chapter 19.87 governs Coastal Development Permits, and the Coastal Commission keeps appeal authority in mapped areas. Parcels in the Flood Hazard overlay may need a separate flood permit and an engineer’s certification (zoning overview). The city also documents years of cross-border sewage pollution from the Tijuana River, which has closed beaches for long stretches (City of Imperial Beach). That is worth knowing if your tenants or short-term guests come for the beach.

Older wood-frame apartments near the water are exposed to salt air, so look closely at balconies and exterior stairs. Buildings with three or more units need SB 721 inspections of elevated elements (SB 721 balcony inspections), and older soft-story buildings call for a seismic retrofit review.

Underwriting an Imperial Beach multifamily purchase

Confirm the zone and any overlay on the city’s map, then check whether the unit count is legal under that zone’s density.
Find out the certificate-of-occupancy date to see whether AB 1482 applies, and use the current 8.2% San Diego cap in your rent projections.
Get estoppels and the rent roll for every unit (estoppel certificates).
Don’t count short-term rental income unless the parcel is in a zone or overlay that allows it.
Order a balcony and stair inspection on coastal buildings with three or more units, and price corrosion repairs.
If you plan to add units, budget for a Coastal Development Permit and site plan review. Run the numbers with our rental property analysis.

Questions people ask

Does Imperial Beach have rent control?

No local ordinance appears on the Attorney General’s chart. AB 1482 applies, and the San Diego-area cap is 8.2% for increases from August 2026 through July 2027.

Which zone allows the most units?

C/MU-1 allows one unit per 1,000 sq ft of lot area. Among the residential zones, R-1500 allows the most, at one per 1,500 sq ft and up to 29 units per net acre.

Can I build a fourplex in R-1500?

On a large enough lot, yes. Fourplexes are a by-right use, and two to four units get staff-level site plan review.

Can I short-term rent a beach duplex?

Only where the code permits it, mainly in the C/MU zones and the Seacoast overlay. Check the parcel’s zone first.

Does SB 9 apply in Imperial Beach?

It applies to lots in the single-family zones, R-1-6000 and R-1-3800. Coastal permitting can still apply.

Do I need a Coastal Development Permit to add units?

Often yes. Check Chapter 19.87 and whether the parcel falls in the Coastal Commission’s appeal area.

Sources & notes

General information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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