Multifamily Fundamentals Are Improving, but Performance Remains Uneven

Recent multifamily research points to improving conditions across the country, although the recovery remains highly dependent on geography and property positioning.

According to Yardi Matrix's October 7, 2026 report, national advertised rents increased 0.3% during the third quarter, marking the first third-quarter gain in four years. Advertised rents were up 1.4% year to date through September, while overall occupancy had increased 50 basis points since January.

However, 14 of the 30 largest multifamily markets continued to report negative year-over-year rent growth in September. San Francisco, New York, Chicago, and Kansas City were among the stronger markets, while Austin, Houston, Denver, and Tampa remained under pressure.

For acquisition underwriting, the distinction between national improvement and local performance matters. A property in a market with limited new supply may have a different near-term operating outlook than a comparable asset competing against newly delivered communities offering aggressive leasing incentives.

Building the Underwriting Around Actual Property Performance

A reliable multifamily acquisition model starts with the property's current financial position rather than the seller's projected stabilization assumptions.

Sponsors should reconcile the rent roll, trailing operating statements, occupancy reports, and leasing data to establish a realistic starting point for the business plan. In-place rents, lease expirations, concessions, delinquency, and other income should be evaluated alongside comparable properties and current submarket conditions.

Particular attention should be given to the difference between contractual rents and the income the property is actually collecting. A community may show attractive rent growth on recently executed leases, but that improvement may not be reflected throughout the existing rent roll for several quarters.

Similarly, an acquisition with substantial loss-to-lease may appear to offer meaningful upside. Whether that upside is achievable depends on renewal activity, competing properties, affordability, and the pace at which existing leases can be marked to market.

Commercial real estate financial modeling should distinguish income already supported by existing operations from future improvements that depend on executing the business plan. Treating projected rent increases as though they were already achieved can overstate near-term cash flow and distort acquisition returns.

Accounting for Concessions and Effective Rent Growth

Rental concessions remain an important underwriting consideration, particularly in markets that have experienced substantial apartment deliveries.

CBRE's 2026 multifamily outlook notes that many operators continue prioritizing occupancy over aggressive rent increases, using concessions to attract residents while relying on renewal activity to support operating performance. Its midyear forecast maintained projected national annual rent growth of 1.4%, with considerably different expectations across coastal, Midwest, and Sun Belt markets.

For sponsors, advertised asking rents provide useful market context but do not necessarily represent the effective revenue a property can generate. Free-rent periods, reduced fees, and other leasing incentives affect collected income and should be reflected in the underwriting.

Concession assumptions also need to account for timing. A sponsor acquiring a property during an active lease-up may anticipate reducing concessions as nearby developments stabilize. However, removing those incentives before market conditions support the change could result in slower leasing or higher vacancy.

The financial model should therefore distinguish between gross potential rent, concessions, vacancy, credit loss, and effective rental income. This creates a more realistic forecast of revenue growth and allows sponsors to evaluate the financial impact of concessions remaining in place longer than expected.

Evaluating Supply at the Submarket Level

National construction trends are useful indicators, but acquisition decisions ultimately depend on competition within the property's immediate market.

Northmarq's September 2026 multifamily report estimated that approximately 300,000 new apartment units would be delivered nationally during the year, compared with roughly 430,000 in 2025. While the declining construction pipeline suggests easing supply pressure, the remaining deliveries are not evenly distributed across markets.

Sponsors should evaluate recently completed properties, projects currently leasing, and developments expected to deliver during the anticipated hold period. The analysis should consider not only the number of units entering the market but also their location, price point, amenities, and target renter demographic.

A Class B acquisition, for example, may face indirect competition from newly constructed Class A communities offering concessions that narrow the effective rent difference between properties. That competition can influence both achievable rental rates and resident retention.

Development underwriting requires the same level of attention. Projected delivery dates, lease-up velocity, competing supply, and stabilization assumptions should reflect the market conditions expected when the property opens rather than relying solely on current occupancy and rental trends.

Operating Expenses Can Change the Investment Thesis

Revenue growth often receives the most attention during acquisition underwriting, but operating expenses can be equally influential in determining investment returns.

Property taxes, insurance, payroll, utilities, repairs and maintenance, and management costs should be evaluated using the property's historical performance and reasonable expectations for future operations.

Acquisition underwriting should also account for expenses that may change following the transaction. Property tax reassessments, insurance renewals, deferred maintenance, and planned capital improvements can materially alter projected net operating income.

For value-add acquisitions, the model should connect renovation costs and timelines directly to anticipated rental premiums. Sponsors need to understand whether the incremental income supports the investment required and how delays in renovation or lease-up could affect overall returns.

Connecting Acquisition Underwriting With Financing

The financing structure is another critical component of multifamily acquisition analysis. Loan proceeds, interest rates, amortization, reserve requirements, and equity contributions all influence the sponsor's required investment and projected returns.

An acquisition may produce attractive unlevered economics but deliver a considerably different leveraged return depending on the available financing.

Sponsors should evaluate debt alternatives alongside the property-level business plan rather than waiting until underwriting is complete. Different lenders may size proceeds based on debt service coverage, debt yield, loan-to-value requirements, or other underwriting constraints.

Changes in projected NOI can affect both property valuation and borrowing capacity. If a revised operating forecast produces lower lender proceeds, the additional equity requirement may change the economics of the acquisition even when the purchase price remains unchanged.

Maintaining financing assumptions within the acquisition model allows sponsors to compare capital structures, evaluate lender feedback, and understand how debt terms affect cash flow, IRR, equity multiple, and downside exposure.

Stress Testing Returns Before Committing Capital

A strong acquisition model should illustrate how the investment performs when the business plan does not unfold exactly as projected.

Sponsors should evaluate alternative scenarios involving slower rent growth, extended concessions, higher operating expenses, delayed stabilization, lower refinancing proceeds, and changes in exit capitalization rates.

These sensitivities can reveal whether projected returns are supported by durable property-level cash flow or depend heavily on optimistic assumptions.

For instance, a transaction may meet its targeted IRR under the base case but fall below the sponsor's investment threshold if rent growth is delayed or the exit cap rate expands. Understanding those outcomes before submitting an offer provides a clearer basis for negotiating purchase price, structuring financing, and determining the appropriate acquisition strategy.

As multifamily conditions continue to improve unevenly across markets, disciplined acquisition underwriting remains essential. The objective is not to predict every market movement, but to understand how the investment performs under a reasonable range of outcomes and establish an acquisition basis that reflects those risks.

Multifamily Acquisition Underwriting Support From Foss Real Estate Partners

Foss Real Estate Partners works alongside commercial real estate sponsors on acquisition underwriting, development financial modeling, due diligence, and capital markets execution. Our team develops and maintains detailed financial models, evaluates alternative business plans, and incorporates financing assumptions throughout the transaction.

Whether evaluating a new multifamily acquisition or working through a more complicated investment opportunity, Foss provides experienced financial resources that integrate directly into sponsors' existing deal teams.