Rent Growth Assumptions in a Syndication Pro Forma: How to Test Them

Rent growth is the assumption in an apartment syndication pro forma that most changes the projected cash flow and sale price. A small change in the yearly rent increase compounds across the hold, and it also changes the value the sponsor uses at sale. This article explains how to test the rent growth number before you invest. It does not predict where rents are going, and no projection is a guarantee.

Why rent growth matters so much

A pro forma usually starts from the property's income today and grows it each year. Expenses grow too, but often at a different rate. The gap between the two decides how much cash flow is left for investors. Rent growth also drives the sale price, because many sponsors value an apartment building using its net operating income and a capitalization rate.

That is why two pro formas with the same purchase price can show very different results. The difference is often in the rent line.

Step 1: Ask for the number, year by year

A good pro forma shows the rent growth for each year of the hold, along with the expense growth and the vacancy. If the sponsor shows one flat number, ask why. A rent that rises fast in year one and slowly later may be more realistic than a steady rate, or it may be an attempt to make the early years look strong.

Ask the sponsor where the number came from. Common sources are local apartment market reports, rent surveys of nearby properties and the historical rent history of the property itself. Ask for the source, the date and the area it covers.

Step 2: Compare market rent with the rent collected today

Two gaps matter.

• In-place versus market rent. If the building's current rents are below the market, the sponsor may plan to raise rents toward market as leases turn over. That is a value-add plan, and it has its own cost for renovations and vacancy. Ask how many units they expect to move to market rent, at what cost, and over how long.
• Asking rent versus effective rent. The asking rent is the list price. The effective rent is what the building collects after concessions such as free months. A pro forma that uses asking rent for a building that offers large concessions overstates income.

A worked example with made-up numbers: a 100-unit building has an average collected rent of $1,400 a month, and nearby comparable units ask $1,550. The sponsor plans to move 40 units to market over three years. The pro forma then shows a large rent increase in year two. Ask what it costs to renovate those units, how long each one sits empty during the work, and what happens if the comparable rents do not hold.

Step 3: Read the lease expirations

The rent roll shows when each lease ends. If most leases end in the same year, the building faces a renewal risk all at once. If leases are spread out, the sponsor can adjust rents more gradually. The multifamily underwriting basics guide explains how the rent roll and the trailing income statement fit into the underwriting. Check the lease schedule against the rent growth line before you rely on either.

Step 4: Check vacancy and concessions

Rent growth and occupancy work together. A sponsor may project higher rents but lower occupancy, or a steady occupancy with more concessions. Either can change the income line. Ask for the vacancy and concession numbers that sit behind the rent line, and check that they match the assumptions in the market data.

Step 5: Ask for a downside case

Ask the sponsor to show the deal with slower rent growth, for example half of the base-case rate, and with the same expense growth. Then ask three questions.

1. Does the property still cover its loan payments in each year?
2. Does the deal still have the reserves it planned for?
3. How much does the sale price fall, using the same capitalization rate?

A sponsor who can show these numbers clearly is giving you the information you need to judge the risk. A sponsor who cannot is asking you to trust the base case. For how the loan side of this works, see real estate capital stack.

What rent growth cannot tell you

No rent growth number is certain. Local markets change, new supply can arrive, interest rates change buyer demand, and a single large employer can move. The purpose of testing is not to find the right number. It is to see how much the deal depends on the number, and whether the sponsor has thought about the risk.

Questions to ask the sponsor

• What rent growth does each year assume, and what data is it based on?
• How far is in-place rent from market rent, and what does it cost to close the gap?
• How many leases expire each year, and how will renewals be handled?
• What concessions and vacancy are in the pro forma?
• What does the deal look like with slower rent growth?

Sources

• U.S. Census Bureau, Housing Vacancy Survey (rental vacancy and rent data)
• U.S. Bureau of Labor Statistics, Consumer Price Index, shelter and rent of primary residence

This article is general information as of October 2026, not legal, tax or investment advice. The numbers in the example are invented for illustration. No rent growth, return or cash flow is guaranteed, and a projection is an estimate that can be wrong. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.