Multifamily and Duplex Properties for Sale in Holy City: Zoning and Rent Rules

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What multifamily in Holy City looks like

In Holy City, "multifamily" almost always means a mountain home with an accessory dwelling unit or junior ADU, an older cabin or second house on a larger parcel, or a property with legal nonconforming extra units built decades ago. There are no apartment buildings or multifamily zones in the community, and the County’s hillside rules are written to keep it that way. What can be added depends far more on water, septic, slope and fire access than on zoning density. For a home with one to three added units, read financing 2-4 unit properties; apartment building loans apply to larger buildings in the valley.

Where the zoning allows it

Holy City is unincorporated, and mountain parcels in this area are generally zoned HS Hillside under the County’s Chapter 2.20 rural base districts; confirm a parcel’s district on the County zoning map.

Housing type	HS Hillside	Notes
Single-family home	By right	Subject to building site approval
ADU and junior ADU	By right	Water, septic and fire access still required
Movable tiny home	Planning clearance
Multifamily	Not allowed	Except parcels with an -os designator
Urban primary units	Not allowed	Allowed only in Rural Residential
Farmworker housing	Special permit	Small, large and seasonal
New lots	160 acres without slope-density	Cluster lots at least 2 acres

Slope-density. Where slope-density applies in HS, the minimum land per home starts at 20 acres where average slope is under 10% and rises to 160 acres above 50% slope, so most Holy City parcels cannot be divided further. The County’s zoning summary describes the district’s goal as keeping mountain land largely open with very low-density housing.

ADUs and SB 9. County ADU and SB 9 rules come from a 2023 ordinance. In a June 24, 2025 letter, the state housing department found it out of step with state law on several points, including ADU height limits, the County’s ban on separate ADU sale, its treatment of the A, AR and HS zones and its use of septic as a standard for SB 9. SB 9 is limited to single-family residential zones and excludes very high fire hazard severity zones in most cases, so it rarely helps in HS hillside land; confirm with County Planning and check for amendments. See our ADU investment guide and SB 9 lot split guide.

Rent rules: state law and County protections

The Attorney General’s rent cap page, updated July 16, 2026, places Santa Clara County in All Other Counties, with covered units capped at 8.6% for increases starting August 1, 2026 through July 31, 2027. Its local ordinance chart lists only San Jose and Mountain View in the county, so no city rent ordinance reaches Holy City. Many Holy City rentals are single-family homes or ADUs owned by individuals, which can be exempt from AB 1482’s cap with the required notice.

County tenant protections. A County tenant protection presentation from February 2025 notes that County Code already requires relocation help when tenants must leave unsafe or red-tagged units, which matters for older mountain cabins, and proposed extending protections to single-family homes, duplexes and condominiums. The Board’s later action was reported in local news in June 2026; we did not confirm adopted text, so check current terms. See our AB 1482 guide and just cause eviction guide.

Holy City rental property rules

Permits for every unit. Many older mountain properties have cabins or converted structures without permits. Before counting rent from a second unit, confirm it was legally built or can be legalized as an ADU.
Red-tag risk. Because County Code requires relocation help when a unit is red-tagged as unsafe, an unpermitted unit carries both legal and relocation cost risk.
Short-term rentals. Paid lodging is subject to County transient occupancy tax registration; B&B inns need a use permit.
Transfer tax. Only the County documentary transfer tax applies, at $0.55 per $500 under County Ordinance Code Div. A30, Ch. III; confirm the amount in escrow.

Wells, septic, slopes and fire

These four factors decide whether a Holy City property can add a unit. A March 14, 2024 County Planning letter for a new home off Old Santa Cruz Highway, on HS land, shows the checklist:

Water. Environmental Health water clearance with a well completion report, well yield test and water samples.
Septic. An approved onsite wastewater system shown on the plans. Septic capacity is often the real limit on an ADU.
Geology. That parcel was in an earthquake fault zone and a seismic landslide hazard zone, requiring updated geotechnical reports and slope review.
Fire access. In the State Responsibility Area and wildland-urban interface, an 18-foot all-weather driveway rated for 75,000 pounds, a turnaround, defensible space and hydrant or water tank details.
Roads. Private roads built to County standards or a pro rata improvement proposal, plus proof of legal access.

Older wood-frame cabins and homes on slopes should be reviewed for seismic retrofit needs; SB 721 balcony inspections apply only to buildings of three or more units.

Underwriting a Holy City rental property

Confirm the zoning district and whether every existing unit is permitted.
Get well yield, water quality and septic records from County Environmental Health.
Price any needed road, driveway, water tank or defensible space work for a new ADU.
Classify each unit under AB 1482 and the County tenant rules.
Collect leases and estoppel certificates.
Rebuild expenses with reassessed taxes, wildfire insurance and septic maintenance in our rental property analysis.

Questions people ask

Can I build a duplex or apartment in Holy City?

Generally no. Multifamily is not allowed in HS except on -os parcels, and urban primary units are limited to Rural Residential.

Can I add an ADU to my Holy City home?

ADUs and junior ADUs are allowed by right in HS, but you still need water clearance, an approved septic system and fire access.

Can I split my Holy City lot?

Rarely. HS requires 160 acres without slope-density, and slope-density starts at 20 acres per home.

Is there rent control in Holy City?

No city ordinance applies. AB 1482 covers qualifying units at up to 8.6% from August 1, 2026, and County tenant rules apply in unincorporated areas.

Does SB 9 apply in Holy City?

Rarely. It targets single-family residential zones, and the state flagged the County’s handling of HS and septic in 2025.

What usually stops an ADU in the mountains?

Septic capacity, well yield, slope stability and fire access.

A nearby mountain permit file: what reviewers requested

The County’s March 14, 2024 Harvey Way review letter concerns one proposed house and driveway, not an approved project or a community-wide entitlement. Reviewers requested legal-lot evidence, surveyed slope calculations, culvert capacity analysis, recorded access easements, water clearance, wastewater approval and updated geotechnical work. Fire review addressed road load capacity, turnarounds and defensible space. For a Holy City-area acquisition, ask which equivalent records apply to the actual parcel. Do not transfer that file’s zoning, hazard designation or dimensional requirements to another property.

Sources & notes

Note: The 2024 letter concerns one parcel off Old Santa Cruz Highway and does not name Holy City; we use it to illustrate County requirements. HS zoning for Holy City parcels is expected, not confirmed on the map. The HCD letter and County presentation were reviewed for our county guide; the June 2026 Board vote is from news coverage only. SB 9 fire-zone and permit comments are general.

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

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