Multifamily and Duplex Properties for Sale in Aromas: Zoning and Rent Rules

What multifamily in Aromas looks like

Aromas is a rural village, so multi-unit income property is mostly small: a house with an ADU or guesthouse, an older duplex or second dwelling in the village, a rural parcel with farm employee housing, or a mobile home on a ranch. Apartment buildings are rare. Water service and septic capacity set the practical ceiling on units. For financing basics, see financing 2-4 unit properties and apartment building loans.

Start with the county. Much of Aromas is in Monterey County, but the community and its fire and water districts reach into San Benito County, and some parcels are in Santa Cruz County. LAFCO of Monterey County’s 2006 North County review notes that San Benito County’s plan supports more development, including some suburban densities, than the Monterey and Santa Cruz plans. This page covers the Monterey County side.

Where the zoning allows it

On the Monterey County side, Title 21 and the North County Area Plan supplemental policies, dated October 26, 2010, control housing.

The one-home policy. Policy NC-1.5 limits residential development in the North County planning area to the first single-family dwelling on a legal lot, pending a County review of water supply, wastewater and circulation constraints. Community Areas, Rural Centers and Affordable Housing Overlays are exempt. Ask the County how it applies NC-1.5 today, including to ADUs, since state ADU law has changed since 2010. It can decide whether a second unit is possible at all.

MDR density comes from the map suffix, so MDR/4 allows up to four units per gross acre. The district requires a 6,000-square-foot minimum site, a 30-foot height limit and 35% coverage. Projects of more than two units must landscape 10% of the lot, and projects over five units need a recreation area. Many Aromas parcels carry rural or agricultural zoning rather than MDR, so confirm the zoning string first.

SB 9. In unincorporated areas, SB 9 applies only to single-family-zoned parcels inside a Census urbanized area or urban cluster, and many farmland and fire hazard parcels are excluded. Confirm with the County whether any Aromas parcel qualifies. See our SB 9 lot split guide and ADU investment guide.

Rent rules: state law only

Rent caps. The Attorney General’s rent cap page, updated July 16, 2026, puts Monterey County in All Other Counties. Covered units may rise up to 7.7% for increases from August 1, 2025, and 8.6% from August 1, 2026 through July 31, 2027. The AG’s chart lists Salinas as Monterey County’s only local rent ordinance, not unincorporated Aromas. See our AB 1482 guide.

Just cause. Covered tenancies follow state just cause rules. Single-family homes and ADUs owned by individuals can be exempt from AB 1482 with the required lease notice. See our just cause eviction guide.

Aromas rental property rules

• Short stays. The County’s short-term rental page says inland stays of 30 days or less may be allowed only with a discretionary permit in certain districts. MDR lists homestays and limited vacation rentals under Section 21.64.290, so read that section before counting on nightly income.
• Lodging tax. Owner-rented homes on the Monterey County side owe the 10.5% County TOT, and operators must register.
• Transfer tax. Monterey County Code Chapter 5.32 sets the county documentary transfer tax at $0.55 per $500 ($1.10 per $1,000); who pays is a matter of contract and local custom.

Water, wells and septic

Water district. The Aromas Water District provides domestic water and owns wells, storage tanks and pipelines, according to LAFCO. In 2011 it proposed adding about 1,720 acres in Monterey County to its sphere and annexing two subdivisions near Dunbarton Road, serving about 72 homes with supply problems, per its CEQAnet filing (SCH 2011111048). Confirm whether a parcel is inside the district and whether a new connection is available.

Wells. Outside the district, North County Policy NC-5.4 requires a permit for every new well except replacements, and NC-3.8 requires a discretionary permit for wells in fractured or hard rock areas. Adding units on a shared or private well needs a yield test and water quality testing.

Septic. The County’s onsite wastewater management program, dated April 3, 2018, notes high nitrate levels recorded in North County and names overloaded onsite systems among suspected sources. Septic sizing will usually decide how many bedrooms or units a rural parcel can support.

Buildings. Older rural second dwellings may lack permits. A seismic retrofit review is worthwhile on older wood-frame homes, and SB 721 applies only to buildings of three or more units with elevated decks.

Underwriting an Aromas multi-unit purchase

1. Confirm the county, the zoning string and how NC-1.5 affects added units.
2. Verify permits for every dwelling, including ADUs and mobile homes.
3. Confirm Aromas Water District service or well permits, yield and water quality.
4. Evaluate the septic system for the full unit and bedroom count.
5. Classify units under AB 1482, model covered increases at or below 8.6%, and collect estoppel certificates.
6. Rebuild expenses with reassessed taxes, fire insurance, well and septic upkeep in our rental property analysis.

Questions people ask

Sources & notes

1. Monterey County General Plan, North County Area Plan supplemental policies
2. LAFCO of Monterey County, North County Municipal Services Review (2006)
3. CEQAnet, SCH 2011111048, Aromas Water District
4. Title 21, Chapter 21.12, MDR and Chapter 21.18, LC (GoCodebook)
5. Monterey County Local Agency Management Program (2018)
6. County HCD, short-term rentals and County TOT
7. California Attorney General, Rent Caps
8. Monterey County Code Chapter 5.32, Documentary Transfer Tax

Note: We did not verify parcel zoning, current NC-1.5 implementation, the 2011 annexation outcome or San Benito County rules.

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

Related: Aromas real estate guide · Commercial real estate in Aromas · Multifamily investing guide · Investor services