Multifamily’s New Math Problem: Slower Population Growth and Softer Rents

If you own apartments—or are considering investing in them—you’ve probably noticed something changing in the market.

Rent growth isn’t what it was a few years ago. Lease-ups are taking longer in some markets. And new supply is putting pressure on pricing in many Sunbelt cities.

The reason may be bigger than interest rates or short-term economic cycles. According to the latest data from Yardi Matrix, the underlying math that drives apartment demand is beginning to shift.

Slower population growth, declining immigration, record-low birth rates, and cooling migration trends are all starting to impact multifamily fundamentals.

The good news? The market is far from dire—but it may require investors and operators to adjust expectations.

Population Growth — The Engine Behind Apartment Demand — Is Slowing

Apartment demand ultimately comes down to one simple factor: people.

More people typically means more households and more renters. But recent population data shows that growth is slowing.

Between July 2024 and July 2025, the U.S. population grew by 1.8 million people, reaching 341.8 million total residents. While still positive, that represents the slowest annual growth since the pandemic.

It’s also a significant drop from the 3.2 million people added the previous year.

Two major factors are driving this trend.

1. Immigration Has Declined Dramatically

Immigration has historically been one of the strongest drivers of rental housing demand.

But the numbers have dropped sharply.

• 2.7 million immigrants entered the U.S. between 2023–2024

• 1.3 million between 2024–2025

That represents a 54% year-over-year decline.

Because immigrants are more likely to rent than own, changes in immigration policy can have a meaningful impact on apartment demand.

2. Birth Rates Are at Historic Lows

At the same time, the U.S. birth rate continues to decline.

In 2025, there were 3.6 million births, representing just 1.06% of the population—the lowest birth rate ever recorded.

Over time, fewer births mean fewer households forming in the future, which slows long-term housing demand.

Migration Between States Is Cooling

Another major trend shaping multifamily demand is domestic migration.

During the pandemic boom, millions of Americans moved to Sunbelt and Mountain West states in search of affordability and lifestyle changes.

But that trend is slowing.

• 2022–2023: about 1 million people moved between states each year

• 2025: migration dropped to 550,000 people

  
  

While states such as Texas, North Carolina, South Carolina, Tennessee, and Arizona are still attracting residents, migration levels are now below the averages of the past several years.

One notable shift: Colorado recorded its first year of out-migration in 20 years, with population declining by about 0.2%.

Rent Growth Has Flattened

These demographic shifts are starting to appear in rental data.

According to the Yardi Matrix report:

• Average U.S. apartment rent: $1,740

• Year-over-year change: –0.1%

  
  

While the decline is modest, it signals a shift from the strong rent growth many operators experienced in recent years.

Occupancy trends also softened slightly:

• National occupancy: 94.3%

• Year-over-year decline: 0.4%

  
  

In fact, 28 of the top 30 apartment markets saw occupancy decline year over year.

Oversupply Is Pressuring Several Markets

Another factor affecting rent growth is new supply.

A large number of apartment developments delivered over the past few years—especially across the Sunbelt—are still in lease-up.

Some of the markets experiencing the largest rent declines include:

• Austin: –5.2%

• Phoenix: –3.6%

• Denver: –3.2%

• Tampa: –3.2%

• Charlotte: –1.9%

  
  

In many cases, these declines are driven by temporary supply imbalances rather than a long-term demand collapse.

Gateway Markets Are Recovering

Interestingly, several gateway markets are now showing some of the strongest rent growth.

Top performers include:

• New York: +4.2%

• San Francisco: +3.6%

• Chicago: +3.5%

• Twin Cities: +2.3%

• Kansas City: +2.0%

  
  

These markets lagged during the early post-pandemic recovery but are now regaining momentum.

The Bottom Line

Multifamily fundamentals remain solid—but the environment is clearly shifting.

Slower population growth, reduced immigration, moderating migration trends, and a wave of new supply are creating a more balanced—and in some markets, temporarily softer—operating environment.

For investors, this is where strategy matters.

The opportunity today isn’t chasing aggressive rent growth—it’s buying right. That means acquiring assets at a low basis, ideally near the lower end of the current cycle. Not calling the exact bottom—but getting close enough that you’re positioned ahead of the next phase.

From there, it becomes a disciplined execution game:

• Hold through the softness rather than relying on short-term appreciation

• Operate efficiently and conservatively

• Prioritize tenant retention to reduce turnover and stabilize cash flow

In other words, you’re building durability into the asset while the market works through excess supply and softer demand.

Because when fundamentals eventually strengthen—and rent growth returns—you’re no longer trying to catch the wave.

You’re already in position.

And in this cycle, that positioning—buying at the right basis and holding through the trough—may be what ultimately separates average outcomes from exceptional ones.