Apartment deals bought at a 5 cap and the 2026 refinancing math

Two hypothetical Charlotte-area apartment loans show why the payoff balance, current net operating income and new debt service matter more at maturity than the purchase cap rate alone.

Published 17 September 2026 · Updated 24 September 2026

Loans written in the low-rate period are reaching maturity with different operating results and a different cost of debt. A sound apartment property can still face a refinancing gap. The size of that gap depends on the actual payoff, underwritten NOI, loan terms and lender sizing. Two deliberately simplified deals make the distinction visible.

Interest rates are observable, but a loan quote is not the Treasury yield or SOFR alone. A fixed-rate quote includes a spread and property-specific terms; a floating loan includes its spread, rate-cap requirements and fees. On 22 September 2026 the 10-year Treasury constant-maturity yield was 4.96%. SOFR was 3.87% on 23 September. These dated observations should not be used as promises of a quoted mortgage rate.

Operating costs also matter. Insurance, taxes, repairs and payroll can absorb rent growth before it becomes NOI. An acquisition or recapitalization should start from the trailing operating statement, current rent roll, tax position and actual insurance quote. The property's forward NOI needs to be reconciled to those documents.

At constant NOI, value equals NOI divided by cap rate. For $1 million of NOI, a 4.50% cap indicates about $22.22 million; a 5.50% cap indicates about $18.18 million. The $4.04 million difference, or 18.2%, is useful for sensitivity testing. A particular property's sale price depends on its NOI, condition, location and buyer financing.

Assume a 200-unit property was purchased in 2021 for $40 million on $2 million of in-place NOI, a 5.00% going-in cap. The buyer borrowed $26 million at 3.50% fixed, amortized over 30 years, with a five-year maturity. Initial loan-to-value was 65%; original equity was $14 million. These are assumed figures, not an observed transaction.

Five years later, assume NOI is $2.15 million and a 5.50% cap implies a value of $39.09 million. The loan amortizes to approximately $23.32 million. At an illustrative 6.20% fixed rate and 30-year amortization, a 1.25x DSCR supports about $23.40 million; an 8.0% debt-yield test supports $26.88 million; and 65% LTV supports $25.41 million. DSCR limits proceeds.

The old balance almost fits inside the new loan. It would be a mistake to call this a clean refinance without asking for closing costs, lender fees, required reserves, repairs, escrows and a fresh appraisal. Even a small fee or reserve could require cash. The reason the gap is manageable is that moderate leverage and five years of amortization reduced principal by approximately $2.68 million while the interest cost stayed fixed during the term.

Now assume a different 200-unit property was bought for $48 million on $2.16 million of in-place NOI, a 4.50% cap. The buyer put in $12 million of equity and borrowed $36 million at SOFR plus 325 basis points, interest-only. The planned renovation was supposed to lift NOI to $3.10 million. Assume actual NOI reaches only $2.45 million and the property is valued at a 5.50% cap: about $44.55 million.

The $36 million principal has not amortized. At 3.87% SOFR on 23 September 2026, the uncapped contractual rate would be 7.12%, or about $2.56 million of annual interest. That exceeds $2.45 million of NOI. Actual cash interest could differ while a purchased rate cap is in force; its strike, expiry and replacement cost must be examined separately. The worked refinance below instead assumes a new 6.20% fixed loan on a 30-year amortization schedule, subject to the same lender tests used above.

The asset value is about 7% below its purchase price, yet the new loan falls about $9.33 million short of the old principal. That gap is about 78% of the original $12 million equity contribution. It does not mean the investor has already lost 78%: it is the new cash needed to refinance under these assumptions. A sale at the indicated value with 2% selling costs would leave about $7.65 million after repaying principal, before other obligations, roughly 36% less than original equity.

To support a $36 million new loan solely under the 1.25x DSCR test at the assumed 6.20% rate and 30-year amortization, NOI would need to be about $3.31 million. Other lender tests, costs or a different rate could impose a further limit. The case turns on missed NOI, interest-only principal and high leverage, not on the cap rate alone.

Trepp reported 7.69% delinquency for multifamily CMBS in August 2026. The Mortgage Bankers Association estimated that 17% of commercial and multifamily mortgage balances, about $875 billion, would mature in 2026, while 13% of outstanding multifamily balances would mature that year. Those measures describe different universes. They signal a substantial refinancing calendar and stress in one securitized pool; they do not prove that any particular loan is distressed or identify a single cause of delinquency.

FHFA set 2026 multifamily purchase caps of $88 billion each for Fannie Mae and Freddie Mac, or $176 billion combined, with at least half of their multifamily businesses required to be mission-driven. That supports liquidity for qualifying loans. It does not mean an individual property can borrow enough to retire its existing debt. The lender still sizes to its underwriting and eligibility rules.

An extension can solve a temporary lease-up or renovation delay. It cannot, by itself, restore an NOI projection that the property cannot achieve.

Charlotte absorbed a substantial wave of deliveries in 2024 and 2025. Northmarq reported more than 28,000 units delivered over those two years and strong renter demand in 2025. Local performance differs by submarket and vintage. A newer property's appearance, or the fact that it traded recently, is not evidence of its loan structure or an impending distress sale.

For an existing-property recapitalization, price the remaining units, roof and envelope work, deferred maintenance, amenities, and any code or accessibility scope from actual conditions. Include a realistic sequence, tenant disruption, contingency and carrying cost. For a ground-up alternative, compare all-in delivery cost with a defensible price per unit and achievable rent for existing stock. A per-unit renovation allowance without a surveyed scope can make a refinancing plan look better than it is. Our notes on what makes land around Charlotte developable and how long rezoning takes cover the land side of that comparison.

Start with net proceeds after lender requirements, not a headline loan amount. Then decide whether completing the physical work can create enough durable NOI to justify the capital needed today.

General market commentary, not investment, legal or tax advice, and not a recommendation regarding any security, fund, property or transaction. Confirm property figures and current financing terms with lenders and advisers before acting. SPR Construction LLC is a licensed general contractor and a developer; it is not a registered investment adviser, broker-dealer or law firm.

Sources reviewed 24 September 2026. Last updated: 24 September 2026.