Rent Growth Assumptions

Rent growth is the single largest driver of long-term returns in real estate. Realistic assumptions are 3% nominal (2.5–3.5%) annually, implying roughly 1% real (inflation-adjusted) growth. This matches historical averages and long-term inflation expectations.

Key takeaways

• Historical U.S. rent growth averages 2.5–3% nominally per year (1–1.5% real)
• Markets with population inflow and limited supply can deliver 4–5% annually; mature, low-growth markets deliver 1–2%
• Market rent growth compounds dramatically over ten years: 3% growth turns $1,200 rent into $1,612 by year 10
• Overoptimistic rent assumptions (4–5% baseline instead of 3%) are the most common underwriting error
• Conservative underwriting uses 2–3% nominal, then stress-tests at 0% (zero growth) to see if the deal survives

Why 3% is the honest baseline

Over the past 40 years (1980–2020), U.S. multifamily rent growth averaged 2.8% annually, slightly below nominal inflation (which averaged 3.0%). This implies real rent growth (rent growth minus inflation) was essentially flat over long cycles. Some periods saw real rent growth (1990s tech boom, 2010–2019 supply shortage); others saw real rent decline (post-2008 crash, early COVID).

A 3% nominal assumption is therefore the neutral estimate: rents grow in line with or slightly above inflation. It's not conservative (which would be 2%), and it's not optimistic (which would be 4–5%).

The discipline: use 3% unless you have specific evidence for a different rate.

The evidence-based approach

Before settling on rent growth, examine:

1. Local demographic trends: Is the metro gaining or losing population? Austin added ~200,000 residents 2010–2020 (2.6% CAGR), justifying above-market rent growth. Rust Belt cities grew under 0.5%, justifying 1–2% rent growth assumptions.

2. Supply pipeline: Is new housing being built faster than population growth? If yes, rent growth will be suppressed. If new supply is limited (zoning restrictions, high construction costs), rents can grow faster than population.

3. Historical market rents: Pull Zillow, Rent.com, or CoStar data for the past 5–10 years. A market where rent grew 3.5% 2015–2019 but only 1% 2019–2022 suggests mean reversion; 2.5% forward might be reasonable.

4. Submarket variation: A prime downtown location might see 4% growth; the secondary ring might see 2%; the tertiary market 1%. Your specific property's neighborhood matters more than city-wide average.

5. Employment and wage trends: Rent growth is correlated with wage growth. A market with 3% annual wage growth will struggle to sustain 4% rent growth; one with 4% wage growth can support 4–5% rent growth temporarily (until housing catches up).

Difference between market rent growth and in-place rent growth

Here's a critical distinction often missed:

Market rent growth is what new leases command. When a tenant renews or a unit is re-tenanted, you capture market rent.

In-place rent growth is what your existing tenants pay. If you have tenants on two-year leases and you're in year one, half the building is locked at year-1 rents; the other half will hit market rent when leases renew.

For a new-acquisition pro forma, assume you can raise rent to current market rent within 12 months (through normal lease turnover). Then project market rent growth forward. For an owned property, model when each lease expires and at what rent.

A building with average rent $1,200 but 30% of tenants on below-market leases at $1,100 can't immediately capture $1,250 market rent across the board. You hit it gradually, typically over 3–5 years as tenants turn over.

The impact of 1% difference in growth rate

Small differences in assumed growth rates compound dramatically over a decade:

Annual Growth	Year 1 Rent	Year 5 Rent	Year 10 Rent
1%	$1,000	$1,051	$1,105
2%	$1,000	$1,104	$1,219
3%	$1,000	$1,159	$1,344
4%	$1,000	$1,217	$1,480
5%	$1,000	$1,276	$1,629

A 1% difference in assumed growth (3% vs. 4%) creates a $144/unit difference in year-10 rent. On a 100-unit building, that's $14,400 in NOI, or ~$290,000 in property value (at a 5% cap rate), or ~$50,000 in additional equity proceeds at exit.

This is why overoptimistic rent assumptions are so dangerous: they're baked into every year and dramatically inflate the expected return.

Market cycles and reversion

Real estate markets cycle. A market that saw 5% rent growth 2015–2019 (pandemic/supply shortage era) often sees 0–2% growth 2022–2025 (rate shock, demand softening). Overestimating rent growth in the peak of a cycle is the fastest way to overpay for a deal.

Conservative underwriting uses a blended assumption: if the market averaged 2% 2010–2022 and 4% 2015–2019, assume 2.5–3% forward, not the recent 4%. This builds in mean reversion.

Similarly, demographic tailwinds don't last forever. A market with 3% annual population growth for a decade will eventually face supply catch-up; assume rent growth moderates from 4% to 2.5% as supply increases.

Stress tests at zero growth and regression to mean

Prudent pro formas include sensitivity cases:

Base case: 3% nominal rent growth Conservative case: 1% rent growth (or zero real growth) Downside case: 0% rent growth (rents flat for ten years) Stress case: 1% annual rent decline (recessionary environment, overbuilt market)

If your deal only makes sense at 3%+ rent growth and barely survives at 1%, you're concentrated on rent growth. That's a bet, not a safe investment. A deal that survives even zero rent growth is much safer.

How to handle market-specific rent trends

High-growth markets (Austin, Phoenix, Boise, Raleigh: 3–4% historical): Use 3% base case. Market rent growth has been strong, but extrapolation is risky. Test down to 2%.

Stable, mature markets (Chicago, Atlanta, Dallas, Denver: 2–2.5% historical): Use 2.5% base case. Test down to 1.5%.

Low-growth or declining markets (Pittsburgh, Cleveland, St. Louis: 1–1.5% historical): Use 1.5% base case. Test down to 0%.

Emerging or recovering markets (Nashville, Austin suburbs, Sun Belt secondary markets: 2.5–3.5% recently, but possibly decelerating): Use 2.5–3% base case, but build in a reversion assumption: 3.5% years 1–3, then 2.5% years 4–10.

The danger of backward-looking assumptions

Many investors build pro formas using the past five years of data. If a market grew 4% 2017–2022, they assume 4% forward. But 2017–2022 was unusual: low rates, limited supply, remote-work demand migration. Forward rates, supply, and demand patterns are different. Using recent history without cycling perspective is a classic mistake.

Check whether your 4% assumption is justified by structural factors (population inflow, long-term supply constraints) or was a temporary spike.

Case study: the 2007–2009 cycle

In 2006–2007, U.S. multifamily rents grew 4–5% annually. Investors built pro formas assuming 4% growth going forward. By 2009, rents fell 5–10% in many markets. Properties built on 4% growth assumptions imploded; those modeled conservatively at 2–2.5% survival.

A deal underwritten at 4% growth that assumed $48,000 annual NOI in year 3 might have actually generated $42,000 (0% growth, no rent decline scenario) or $38,000 (rent decline). If the debt service was $46,000, the deal swung from breakeven to deeply negative.

Conservative underwriting would have stress-tested at 0–1% growth, revealing the vulnerability before purchase.

Building rent growth into the pro forma

In the pro forma spreadsheet:

• Year 1: input market rent for the property at acquisition
• Years 2–10: multiply year-1 rent by (1 + growth rate)^years

Example: Year 1 rent $1,200. Year 3 rent = $1,200 × (1.03^2) = $1,273. Year 10 rent = $1,200 × (1.03^9) = $1,564.

Also model the occupancy impact: in strong growth years, properties lease faster and maintain higher occupancy. In weak growth years, occupancy may slip. A market with 0% rent growth often has 5–10% occupancy loss as landlords struggle to fill units or lower concessions.

Real vs. nominal rent growth

Inflation averages 2.5–3% over long periods. If your nominal rent growth assumption is 3%, your real rent growth (growth above inflation) is ~0%. This is consistent with historical data: real rents barely budge over full cycles.

Some investors think in real terms: "Real rent growth of 1.5% means rents grow 1.5% faster than inflation." If inflation is 2.5%, nominal rent growth is 4%. This is less conservative; it implies rents are growing relative to general price levels.

For most underwriting, assume nominal rent growth (3%) and let it implicitly include inflation. This is simpler and more conservative than separating them.

Rent growth comparison flowchart

Related concepts

• The Pro Forma Spreadsheet
• Cap Rate Explained
• Gross Rental Yield

Next

Rent growth drives income; expense growth eats it. Operating expenses rise 3–5% annually, and you need to model them accurately to forecast true NOI.