Multifamily and Duplex Properties for Sale in Lower Lake: Zoning and Rent Rules

What multifamily in Lower Lake looks like

Lower Lake is a small historic town, and its rental market is mostly single-family homes, a handful of duplexes and small multi-unit buildings, mobile homes, and rural properties with second units. The Lower Lake Area Plan, adopted in 1988, found only about 2.1 acres of medium- or high-density residential land. It called multifamily opportunities very limited and listed multifamily rentals and affordable senior housing as unmet needs. Lake LAFCo estimated Lower Lake’s 2010 population at 892 within the sewer area. Larger apartment options are next door in the City of Clearlake. For financing, see financing 2-4 unit properties and apartment building loans.

Where the zoning allows it

Lower Lake follows the Lake County zoning ordinance:

Sewer is the deciding factor. The area plan says the Lake County Sanitation District serves only part of town, within Assessment District No. 1-3. Eastern and northeastern Lower Lake lie mostly outside it and should develop at reduced densities until sewer is available. Off sewer, a duplex lot jumps from 8,000 to 15,000 square feet with public water, or 40,000 on a well.

Noise. The plan requires an acoustical study for new multifamily housing inside the 55 dBA contour along Highways 29 and 53.

ADUs and SB 9. County Article 27 allows one granny unit or second unit per lot, with granny units up to 720 square feet on lots under 40,000 square feet and 1,008 on larger lots. Confirm how state ADU law applies. See our ADU guide. SB 9 depends on whether the parcel is in a qualifying urban area. Ask the county. See our SB 9 guide.

Rent rules: state law only

The Attorney General’s rent cap page lists no local rent control in Lake County. Covered units follow the "All Other Counties" row: 7.7% from August 1, 2025, and 8.6% from August 1, 2026 through July 31, 2027. See our AB 1482 guide and just cause eviction guide. The City of Clearlake’s rental registration and inspection program does not reach unincorporated Lower Lake, and we found no county equivalent.

Lower Lake rental property rules

• Mobile home parks require a major use permit, at least 5 acres and no more than 10 spaces per acre under Article 43. Closures need a relocation plan.
• Condo conversions need a major use permit under Article 44.
• Short-term rentals. The county is drafting rules for unincorporated areas. Stays of 30 days or less owe the 9% TOT.
• Copsey Creek Ranch. The area plan notes that this subdivision has community water but no planned sewer, so lots there stay on septic and the larger lot minimums apply.
• R3 open space. Apartment projects need 100 square feet of private open space per unit, plus 300 square feet per unit of recreation area when there are more than seven units. On the small sewered lots near Main Street, this often limits the unit count before density does.
• Historic buildings. Downtown buildings named in the plan, such as Brick Hall and the Odd Fellows Hall, may face historic review if they are converted to apartments. The county HP combining district governs designated sites.

Sewer, water, fire and site constraints

• Sewer connections. Lake LAFCo’s 2010 review counted 386 Lower Lake connections, about 628 single-family equivalents. It also reported that in 2010 the sanitation district temporarily restricted new connections to the Southeast Regional system after spills. Confirm current connection rules before you plan added units.
• Water. Lower Lake County Waterworks District No. 1 supplies most of town. The area plan reported limited capacity for new connections and iron and manganese problems at several wells. Get a will-serve letter.
• Fire. The Lake County Fire Protection District serves Lower Lake from Station 65. Lake LAFCo’s 2025 review lists a Lower Lake special tax of $147.90 plus CPI per parcel.
• Older stock. Older wood-frame buildings may warrant a seismic retrofit review. Buildings of three or more units with elevated decks need SB 721 inspections.

Underwriting a Lower Lake multifamily purchase

1. Confirm county jurisdiction, the district, and whether the parcel is inside Assessment District 1-3.
2. Test the unit count against lot minimums for the parcel’s actual water and sewer sources.
3. Classify units under AB 1482 and model increases at or below 8.6%.
4. Get will-serve letters and connection fee estimates from the sanitation and waterworks districts.
5. Collect leases and statements, and get estoppel certificates.
6. Rebuild expenses with reassessed taxes, the fire special tax and septic upkeep in our rental property analysis.

Questions people ask

Sources & notes

1. Lower Lake Area Plan (1988)
2. Lake County Zoning Ordinance: Art. 11 R2, Art. 12 R3, Art. 19 C2, Art. 27, Art. 38, Art. 43, Art. 44
3. Lake LAFCo Sanitation MSR (2010) and Fire MSR (2025)
4. California Attorney General, Rent Caps
5. Lake County STR committee news and TOT Ordinance

Note: The area plan and LAFCo figures are dated. Current sewer and water capacity was not verified.

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

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