Portland multifamily investment guide

Portland is governed by a state rent cap and a separate city rule at the same time, as Los Angeles is. What is different here is that in 2026 the two began pointing in opposite directions. Read them together and the exposure lands on exactly the buildings an owner would assume were safest.

The first rule is statewide. Section 90.323 of the Oregon Revised Statutes provides that during any tenancy other than week-to-week a landlord may not increase the rent "During the first year after the tenancy begins," nor "More than once in any 12-month period," nor by more than the maximum calculated under ORS 90.324, and that any increase after the first year requires written notice at least ninety days beforehand. Section 90.324(1)(b) sets that maximum as the lesser of "Ten percent" or "Seven percent plus CPI," where subsection (4) defines CPI as "the September annual 12-month average change in the Consumer Price Index for All Urban Consumers, West Region (All Items)." The Oregon Department of Administrative Services must calculate and publish the figure by September 30 each year. For 2026 it published 9.5 percent, down from 10.0 percent for 2025.³⁴

The second rule is Portland's alone. Subsection (C) of Portland City Code 30.01.085 attaches relocation assistance to a rent increase "of 10 percent or more within a rolling 12-month period." A tenant who receives that notice may request payment within forty-five calendar days, and the amounts are fixed by unit size: $2,900 for a studio or single room occupancy unit, $3,300 for a one bedroom, $4,200 for a two bedroom and $4,500 for a three bedroom or larger.⁵

Now put the numbers side by side. The 2026 statewide maximum is 9.5 percent. The Portland trigger is ten percent or more. A unit inside the state cap cannot lawfully reach the trigger this year. In 2025 it could, because the cap was exactly 10.0 percent and a landlord taking the full allowance landed precisely on the threshold. The gap between the two numbers opened in 2026, and because the state figure is recalculated every September it can close again.⁴⁵

That leaves one category of building that can still cross ten percent: the category the state exempts. Section 90.323(5)(a) removes the percentage cap where "The first certificate of occupancy for the dwelling unit was issued less than 15 years from the date of the notice of the rent increase." We checked whether Portland's ordinance carves out the same buildings, because the entire finding collapses if it does. It does not. Code 30.01.085 contains no exemption based on building age or certificate of occupancy, and none based on how many units a landlord owns. Its exemptions are for owner-occupied arrangements, week-to-week tenancies, certain federally regulated affordable housing, uninhabitable units and a narrow pre-demolition case.³⁵

The practical result is an inversion. An owner buying recent delivery in Portland is usually told the asset is unregulated, and on the state cap that is true. But it is precisely that asset which retains the legal freedom to raise rent past ten percent, and precisely that increase which triggers a cash payment of up to $4,500 per unit to any tenant who asks within forty-five days. The older building down the street cannot incur the liability at all, because the state forbids it from ever reaching the threshold.⁵

• The 2026 statewide maximum increase is 9.5 percent, recalculated and published every September 30.
• Portland requires relocation assistance on any increase of ten percent or more.
• Buildings with a certificate of occupancy less than fifteen years old are outside the state cap.
• Portland's ordinance has no building-age exemption, so those are the buildings that can trigger it.

New construction escapes the state cap into the one Portland rule that costs cash per unit. Underwrite the relocation exposure on the asset you were told was unregulated.

The regulatory picture is the more unusual half of this market. The demographic picture is the more decisive half.

Between April 1, 2020 and July 1, 2025 Multnomah County fell from 815,400 residents to 795,391, a loss of 20,009 people and a decline of 2.5 percent. Over the same period Washington County grew 1.9 percent to 611,708 and Clackamas County grew 1.2 percent to 426,280. This is not a metro losing population. It is a metro redistributing itself across a county line.²

The money moved with the people, and by a wider margin. Median household income is $107,772 in Washington County and $103,517 in Clackamas, against $88,766 in Multnomah, which puts Washington County about 21 percent ahead of the core county on our arithmetic. Poverty runs 12.7 percent in Multnomah against 8.4 percent in Washington and 8.1 percent in Clackamas. Multnomah retains the highest share of residents with a bachelor's degree, 48.9 percent, and the most employer establishments at 27,204, so this is a gap in household outcomes rather than in credentials or business count.²

Capital has followed. Multnomah permitted 1,594 residential units in 2025 against a stock of 378,432, about 0.42 percent. Washington County permitted 1,886 against 250,943 units, about 0.75 percent, and Clackamas 1,235 against 178,737, about 0.69 percent. The county with the most housing stock and the most people is adding the least, at a little more than half the intensity of the county next door. For an owner of existing assets a low permit rate is usually protective. Here it sits alongside a shrinking population, and a supply constraint is only worth something if there is demand pressing against it.²

One concurrent fact belongs in the record, stated carefully. Multnomah County residents pay local personal income taxes that residents of the other two counties do not. The City of Portland Revenue Division administers the Metro Supportive Housing Services tax of one percent on taxable income above $125,000 for single filers and $200,000 for joint filers, rising to $128,000 and $205,000 for 2026 and indexed thereafter, which applies across the portions of all three counties inside the Metro district. It also administers the Multnomah County Preschool for All tax, which applies only in Multnomah County at 1.5 percent on taxable income over $125,000 for individuals and $200,000 for joint filers, plus an additional 1.5 percent over $250,000 and $400,000 respectively, and which is scheduled to rise by 0.8 percent in 2027.⁶

On those published rates a high-earning Multnomah household pays three percentage points more in local income tax at the margin than the same household across the line in Washington County, becoming 3.8 points in 2027. We are not claiming that this caused the population shift. The Census Bureau publishes no reason for a move, we have not seen a study that isolates one, and asserting a cause we have not measured would be exactly the kind of claim this series exists to avoid. We record it because it is a real, dated, published cost difference that lands on the same county line as the population and income difference, and an investor underwriting the renter base in Multnomah should know both facts and draw their own conclusion.⁶²

• Multnomah County: -20,009 residents, median income $88,766, permits 0.42 percent of stock.
• Washington County: +1.9 percent population, median income $107,772, permits 0.75 percent of stock.
• The Preschool for All tax applies in Multnomah County only, and rises again in 2027.

A low permit rate protects an owner only when demand is pressing against it. In Multnomah County the population is going the other way.

Our position on Portland is cautious, and it is a position about counties rather than about the metro.

We would not buy in Multnomah County at present. The county is losing residents, its median household income trails both neighbors by a wide margin, its poverty rate is half again theirs, and it layers a local income tax on high earners that the neighboring counties do not. Rent takes about 22.3 percent of median household income there on our arithmetic, which is not a stressed figure, but the affordability that produces is a function of a demand base that is getting smaller.²

Washington County is the part of this market we would underwrite. Population is growing, median household income is $107,772, poverty is 8.4 percent, rent runs about 20.6 percent of income on our arithmetic, and the monthly gap between owning with a mortgage and renting is $626, the narrowest of the three counties. The offsetting risk is concentration: the metro's manufacturing employment is centered there and manufacturing shed 4,800 jobs over the year. We would size that risk explicitly rather than net it against the demographics.²¹

Clackamas County we would treat as a thin market rather than a bad one. It is 70.7 percent owner-occupied, which leaves the smallest rental base of the three, and at 2.56 persons per household it is the most family-weighted. Median home value is the highest in the metro at $611,000 while median income is below Washington County, so on our arithmetic the price-to-income ratio is the least favorable of the three at about 5.9 times. Product is scarce and priced accordingly.²

On the regulatory question our advice is the same everywhere in the metro and it is the one thing about Portland we would act on immediately: pull the first certificate of occupancy date before you underwrite the rent roll. That single date tells you whether the state cap binds the asset, and therefore whether the asset is capable of triggering a relocation payment. It is a fifteen year clock counted from the date of the increase notice, so it moves, and a hold period can cross it. Investors evaluating this market alongside others in our coverage may want to read our Boise and Salt Lake City guides, where the demographic direction runs the opposite way.³

Pull the first certificate of occupancy date before you underwrite the rent roll. It decides which of Portland's two rent rules can reach the asset.