Boise Apartment Owners Should Watch Seattle’s Growing Divide Between New and Older Properties

Building more apartments doesn’t automatically hurt every landlord equally.

Seattle’s multifamily market is showing why.

Even with healthy renter demand across the broader region, recently built apartments are capturing a large share of that demand. Older communities are being forced to compete harder for residents, often through lower effective rents, concessions and better incentives.

For Boise commercial real estate investors and multifamily developers, the lesson is important as the Treasure Valley continues adding apartments of its own.

According to reporting by Elliott Krivenko of CoStar Analytics, Seattle-area apartments built before 2020 have collectively lost occupied units over the past five years, while newer properties have absorbed tens of thousands of renters. The original CoStar News article provides the complete analysis.

Seattle and Boise are very different markets. But the competitive dynamics happening there provide a useful look at what can happen when a large development pipeline meets increasingly selective renters.

New Apartments Can Reshape an Entire Rental Market

Seattle added tens of thousands of apartment units during its recent construction cycle.

What’s particularly interesting isn’t simply how many apartments were built.

It’s where renters went.

According to CoStar, market-rate apartment properties completed before 2020 experienced approximately 5,100 units of negative cumulative absorption during the five years ending in the second quarter of 2026.

Newer properties moved in the opposite direction.

Market-rate apartments completed from 2020 onward absorbed nearly 50,000 units during that period—roughly keeping pace with the amount of new inventory delivered.

New affordable housing also captured substantial demand, absorbing nearly 12,000 units.

In other words, Seattle still had renters.

But those renters weren’t distributed evenly throughout the market.

Many chose newer apartments.

That distinction matters enormously to investors.

Boise Multifamily Owners Should Think Beyond Overall Vacancy

Commercial real estate headlines often focus on market-wide vacancy or rent growth.

Those numbers are useful, but they can hide what is happening property by property.

Imagine two apartment communities located a few miles apart.

One was recently completed and offers modern kitchens, attractive common areas, package lockers, fitness facilities, outdoor gathering spaces and updated technology.

The other is 20 or 30 years old and hasn’t received a meaningful renovation.

Both technically compete for renters.

But are they really competing for the same renter at the same price?

Increasingly, maybe not.

That is the lesson Boise multifamily owners can take from Seattle.

As new apartments are delivered across Boise, Meridian, Nampa, Caldwell, Eagle and other Treasure Valley communities, established properties may need to compete more aggressively—even if overall population continues growing.

Strong population growth doesn’t guarantee full occupancy at every apartment complex.

Renters still choose.

Concessions Can Change the Real Cost of Rent

Seattle landlords are responding to increased competition with incentives.

CoStar reported that roughly 40% of apartment properties in the region are now offering some type of concession.

That matters because asking rent doesn’t always tell investors what a property is actually earning.

Consider an apartment advertised at $1,800 per month.

If the landlord gives a new resident one month free on a 12-month lease, the effective rent is closer to $1,650 per month before considering other incentives.

That difference can have a meaningful impact on property income.

For Boise multifamily investors, this is why underwriting should look beyond advertised rents.

You need to understand:

• Effective rent after concessions
• Renewal rates
• Resident retention
• Vacancy by unit type
• Average days vacant
• Competing new construction
• Renovation premiums
• Upcoming lease expirations
• Operating expense growth

Two apartment properties with similar advertised rents can produce very different financial results.

Older Boise Apartments May Need to Reinvest

The biggest question for owners of established properties is how to compete when renters have newer choices.

Price is one option.

But continually lowering rents isn’t always the best long-term strategy.

Renovation can sometimes provide a better answer.

Owners may be able to improve competitiveness through updated flooring, kitchens, bathrooms, lighting, appliances, landscaping and common areas.

Amenities don’t always need to be expensive either.

Better package delivery systems, improved outdoor spaces, pet amenities, stronger internet infrastructure and upgraded fitness areas can help an older property feel more current.

The goal isn’t necessarily to turn a decades-old apartment complex into brand-new Class A construction.

It is to reduce the gap.

That becomes particularly important when new properties are offering concessions.

If a new apartment has better finishes, stronger amenities and two months of free rent, an older property can’t rely solely on being slightly cheaper.

It needs a clear reason for residents to choose it.

Slower Construction Could Eventually Help Existing Properties

There is some good news for landlords in Seattle.

Apartment construction is slowing.

That should eventually reduce the amount of new competition entering the market.

But the effects won’t disappear immediately.

Once thousands of apartments have been delivered, those units remain part of the competitive inventory.

The market still has to absorb them.

That’s an important distinction for Boise development as well.

Developers often focus heavily on what’s currently under construction.

Investors should also look backward.

How many units were delivered over the previous two or three years?

Where were they built?

How quickly are they leasing?

What concessions are those properties offering?

And which existing properties are losing residents as a result?

Sometimes the biggest competitive threat isn’t the project breaking ground next month.

It’s the building that opened last year and is still aggressively trying to reach stabilized occupancy.

Local Insight: Population Growth Doesn’t Protect Every Property

Boise and the Treasure Valley continue to benefit from population growth and long-term housing demand.

That’s positive for multifamily real estate.

But Seattle provides an important reminder:

Growing markets can still produce winners and losers.

A market can add residents while older apartment communities lose occupancy.

Both things can happen at the same time.

For Boise multifamily investors, that makes property selection increasingly important.

Buying an older apartment complex at a lower price per unit can create an excellent value-add opportunity—but only if the renovation budget, achievable rents and competitive position make sense.

For existing landlords, waiting until occupancy drops significantly before making improvements can be expensive. Understanding the upcoming development pipeline allows owners to make improvements before new competition opens.

For developers, today’s lease-up environment should encourage realistic underwriting. A strong Boise demographic story doesn’t guarantee that renters will accept every rent level needed to justify construction costs.

And for investors evaluating Boise commercial real estate, concessions deserve much closer attention.

A property can report strong asking rents while quietly giving away several weeks of occupancy to sign leases.

The headline number isn’t always the real number.

Seattle’s current experience shows what happens after a major apartment construction wave: renter demand remains, but newer buildings can capture an outsized share of it.

Boise isn’t Seattle.

But as the Treasure Valley multifamily market matures, the same basic principle applies.

New supply doesn’t just add apartments. It raises the standard every existing apartment property has to compete against.

For Boise apartment owners, investors and developers, that may be the most important lesson of all.

Mike Gioioso (joy-OH-so) has for 16+ years been helping companies of all sizes buy, build, and lease perfect places for business in greater Boise, Idaho and beyond.
www.streetsmartidaho.com mike@streetsmartidaho.com 208-209-9166

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