Lake Oswego OR rent increase 2026 Oregon’s statewide 9.5% rent cap (ORS §90.323 / SB 611 2023) applies to covered Lake Oswego buildings (certificate of occupancy 2010 or earlier). COUNTY SPLIT TRAP: most of Lake Oswego is Clackamas County → evictions at Clackamas County Circuit Court (807 Main St, Oregon City OR 97045); northern strip (Dunthorpe/Riverdale) is Multnomah County → Multnomah County Circuit Court (Portland). One of Oregon’s wealthiest suburbs (~$130,000+ median household income); premium lakefront SFR $4,000–$8,000+; Oswego Lake private access rights. 90-day advance notice required; just-cause eviction after 12 months; 31-day deposit return.

COUNTY SPLIT TRAP: Clackamas County vs. Multnomah County in Lake Oswego

Lake Oswego city limits span two counties, creating a jurisdiction trap for landlords managing properties in the city.

Most of Lake Oswego — Clackamas County

The large majority of Lake Oswego — including downtown, Mountain Park, the Westlake area, Lake Grove, and the bulk of Oswego Lake-adjacent neighborhoods — is in Clackamas County. Residential evictions for these properties file at:

Clackamas County Circuit Court
807 Main St, Oregon City OR 97045
Phone: (503) 655-8447
Approximately 8 miles south of downtown Lake Oswego

Northern strip — Multnomah County (Dunthorpe / Riverdale)

The northern portion of Lake Oswego city limits — generally north of the main lake and near the Willamette River, including the Dunthorpe and Riverdale areas — lies in Multnomah County. Evictions for these properties file at:

Multnomah County Circuit Court
1021 SW Fourth Ave, Portland OR 97204
Phone: (503) 988-3022

How to verify county

Before filing any eviction, confirm the county of the specific property:

• Clackamas County Assessor: clackamas.us/at (property search by address)
• Multnomah County Assessor: multco.us (property lookup)
• Tax bills typically show the county; utility district assignments may also indicate county.

Landlords who manage multiple Lake Oswego properties across both counties should maintain a property-by-county roster to ensure consistent filing in the correct court.

Oregon statewide rent stabilization in Lake Oswego — ORS §90.323

Oregon’s 2026 statewide cap is 9.5% (7% + 2.5% Oregon CPI-U, hard ceiling 10% — ORS §90.323 / SB 611 2023). For Lake Oswego specifically:

• Older stock (pre-2011 CO): Much of Lake Oswego’s rental inventory consists of single-family homes and condos built in the 1960s through 2000s. These are generally covered by the 9.5% cap.
• Newer luxury units: Some newer apartment buildings and townhomes in the downtown Lake Oswego core have COs from 2011–2020+. These are exempt from the cap — but the 90-day notice and once-per-12-months rules still apply.
• Oswego Lake single-family homes: Standalone homes are typically owner-occupied rather than rental; when rented, verify the CO date. Many lakefront SFRs were built pre-1990 and are covered by the cap.

90-day notice and frequency requirements

Oregon requires 90 days’ advance written notice for all rent increases (ORS §90.600(11)), regardless of whether the unit is covered or exempt from the cap. Increases are limited to once per 12-month period per tenant. For a Lake Oswego property renting at $3,500/month, the 9.5% cap allows a maximum increase of $332.50 — from $3,500 to $3,832.50. Attempting to increase by $400 (11.4%) would be illegal and void for a covered building.

Oswego Lake private access — tenancy complication

The Oswego Lake is a private lake controlled by the Oswego Lake Corporation (OLC). Lake access rights are tied to specific properties and are not automatically transferable to tenants. Landlords who intend to lease a property with lake access should:

1. Review the OLC membership agreement to determine whether tenant lake access is permitted.
2. Obtain written OLC permission or complete the necessary OLC tenant guest application before marketing the property’s lake access as a feature.
3. Document lake access rights (or their absence) in the rental agreement to avoid disputes.

Renting a property with implied lake access that the tenant cannot legally use creates grounds for a habitability claim or misrepresentation dispute in Clackamas County Circuit Court.

Security deposit rules — ORS §90.300

Oregon imposes no deposit cap. In Lake Oswego’s premium market, deposits typically range from 1.5 to 2 months’ rent — on a $4,000/month unit, this means a $6,000–$8,000 deposit. The financial exposure from deposit errors is correspondingly higher:

• Miss the 31-day return deadline → forfeit all deductions (potentially $6,000+).
• Wrongfully withhold $4,000 of a $6,000 deposit → owe $8,000 plus attorney fees.

Best practices for Lake Oswego landlords given high deposit amounts:

1. Conduct a detailed move-in inspection with the tenant, photographed and signed.
2. Obtain the forwarding address at move-in (on the rental agreement) so the 31-day clock can begin immediately upon surrender.
3. Keep deposit funds segregated (even though Oregon has no trust-account mandate, segregation prevents commingling disputes).
4. Provide itemized accounting of deductions with receipts — Clackamas County Circuit Court expects detailed documentation on high-value deposit disputes.

Major employers driving Lake Oswego OR rental demand

Oregon Health & Science University (OHSU)

OHSU (3181 SW Sam Jackson Park Rd, Portland OR 97239) is Oregon’s only academic medical center and among the state’s largest employers, with approximately 18,000 employees including physicians, nurses, researchers, faculty, and administrative staff. Lake Oswego is one of the most popular residential communities for OHSU attending physicians and senior research faculty, who value the city’s school quality (Lake Oswego School District is consistently Oregon’s top-rated district), lake access, and relatively short I-5/Barbur Blvd commute to OHSU (approximately 15–25 minutes in moderate traffic). Attending physician compensation: $250,000–$600,000+. Specialist physicians (cardiology, oncology, neurology): $400,000–$800,000+. This income bracket drives demand for Lake Oswego’s highest-end SFR and lakefront inventory.

Portland General Electric (PGE)

Portland General Electric (121 SW Salmon St, Portland OR), Oregon’s largest investor-owned utility, employs approximately 3,000+ workers including engineers, operations staff, and corporate professionals. PGE’s senior management and engineering leadership frequently choose Lake Oswego for its proximity to PGE’s Portland headquarters via I-5 (approximately 20–25 minutes) and the city’s school system. PGE engineer compensation: $90,000–$160,000+; senior managers: $150,000–$250,000+.

South Waterfront / Marquam Hill employment corridor

Portland’s South Waterfront district and Marquam Hill (the hill on which OHSU sits) house a growing cluster of biotech, medical research, and technology employers accessible from Lake Oswego via I-5 in 15–20 minutes. Employers include OHSU affiliate facilities, Vacasa corporate, Netsol Technologies, and various medical and professional offices. This corridor is expanding and is expected to add several thousand additional positions over the coming decade.

Lake Oswego School District

The Lake Oswego School District serves approximately 6,900 students and consistently ranks as one of the top public school districts in Oregon. The school district is a primary driver of SFR rental demand from affluent families (dual-income professional households earning $200,000–$500,000+) who want access to the district but are in career-transition phases (new to Oregon, pre-purchase, or relocating for OHSU or other employers). School district quality adds an estimated 20–35% premium to SFR rental values in Lake Oswego compared to equivalent homes in Clackamas County unincorporated areas or Oregon City.

Eviction process in Lake Oswego / Clackamas County (and Multnomah County) OR

The correct eviction court depends on the property’s county:

• Clackamas County (most Lake Oswego): Clackamas County Circuit Court, 807 Main St, Oregon City OR 97045, (503) 655-8447.
• Multnomah County (Dunthorpe/north strip): Multnomah County Circuit Court, 1021 SW Fourth Ave, Portland OR 97204, (503) 988-3022.

Oregon eviction actions are called Forcible Entry and Detainer (FED). The procedure is the same in both counties:

Step 1: Written 72-hour notice to pay or vacate

Serve a written 72-hour notice under ORS §90.394. First offense: cure right (tenant may pay and stop eviction within 72 hours). Second offense within 12 months: 6-day no-cure notice. Post on door if no adult present; retain proof of service.

Steps 2–4: FED filing, hearing, writ, and lockout

File at the correct circuit court after the notice period expires unpaid. Hearing within 6 calendar days (ORS §105.135). 10-day appeal period after judgment. Sheriff executes writ within 3–7 business days. Total uncontested: 3–4 weeks.

Self-help eviction (lock changes, utility cutoff) prohibited under ORS §90.375; up to 2 months’ rent in damages plus attorney fees.

2026 rent ranges by Lake Oswego neighborhood

Lake Oswego rents are among the highest in the Portland metro, reflecting school district quality, private lake access, proximity to OHSU, and one of Oregon’s highest median household incomes (approximately $130,000–$140,000+ for the city overall). Lakefront and lake-access properties command a 50–100%+ premium over comparable non-lake units.

10 costliest Lake Oswego OR landlord compliance mistakes

1. Filing eviction at wrong county court: Most Lake Oswego = Clackamas County Circuit Court (Oregon City). Dunthorpe/north = Multnomah County Circuit Court (Portland). Always verify county first on assessor records.
2. Exceeding the 9.5% cap on covered buildings: On a $4,000/month unit, the maximum increase is $380/month. Attempting $500 on a covered building voids the entire increase.
3. Less than 90 days' notice: Void — ORS §90.600(11). Must be completely re-served with full 90-day lead time.
4. Missing 31-day deposit return: On a $6,000 deposit, missing the deadline forfeits all deductions. Wrongfully withholding $4,000 = $8,000+ exposure plus attorney fees.
5. No-fault eviction without relocation payment: 1 month's rent required. On a $4,500/month property, the relocation payment is $4,500 — due on or before the termination date. The notice is void without it.
6. Oswego Lake access misrepresentation: Marketing lake access to tenants without first confirming OLC tenant permissions creates misrepresentation liability.
7. STR / Airbnb violations on OLC-governed properties: Short-term rentals may be prohibited by OLC membership rules or City of Lake Oswego zoning. Research before listing.
8. Ignoring newer-construction exemption vs. cap: A unit built 2012 is exempt from the 9.5% cap — but still requires 90-day notice. A unit built 2009 is covered. Verify CO date.
9. Raising rent twice in 12 months: Both increases void (ORS §90.600(2)).
10. Self-help eviction on premium units: Locking out a tenant paying $5,000/month triggers up to 2 months ($10,000) in actual damages plus attorney fees under ORS §90.375. Clackamas County courts enforce this penalty.

Lake Oswego landlord compliance checklist (2026)

1. Verify county (Clackamas vs. Multnomah) on assessor records for each property before any legal filing.
2. Check building CO date: if 2010 or earlier, 9.5% cap applies. Confirm exact cap at OHCS.oregon.gov.
3. Serve rent increase notice at least 90 days before effective date — ORS §90.600(11).
4. Track 12-month period: no second increase within 12 months of prior increase — ORS §90.600(2).
5. Review Oswego Lake Corporation rules before marketing any lake access to tenants; obtain OLC tenant authorization if required.
6. Verify HOA/CC&R restrictions on short-term rentals before listing any Lake Oswego property on Airbnb/VRBO.
7. Conduct detailed move-in inspection with photos; document and co-sign with tenant.
8. Return deposit within 31 calendar days of surrender AND forwarding address — with full itemized accounting. Given high deposit amounts, prioritize timely return.
9. For 12+ month tenants: any no-fault termination requires 90-day notice + one month's rent relocation paid simultaneously — ORS §90.427(8).
10. For non-payment: 72-hour notice (1st), 6-day no-cure (2nd within 12 months); file FED at correct circuit court after notice expires unpaid.
11. Maintain habitability on all structures including dock/boathouse structures if rented as part of the unit.
12. Honor SCRA rights for military tenants; document verification of orders before any enforcement action.

Frequently asked questions