The Apartment Deal Killed by a Rate Cap Renewal

What happened

In mid-2021 a buyer paid $30 million for a 1980s 200-unit apartment complex at a 4.5% going-in yield, funded with a three-year floating-rate bridge loan. The lender required an interest rate cap, which pays the borrower when the index rises above a set strike. Between March 2022 and July 2023 the Fed raised rates across eleven meetings and overnight SOFR went from 0.05% to 5.31%, so the cap went into the money and became the only reason the loan stayed current. Meanwhile rents grew 0.4% year on year, and when the three-year cap expired in early 2024 the renewal had to be bought at the new price.

The case, start to finish

The deal was not killed in 2024. It was killed in 2021, in a cell of the model nobody stress-tested.

A composite property, and a set of real market numbers

This is an anonymized composite of a 2021-vintage value-add apartment deal, and the distinction matters more than usual here. The property arithmetic is illustrative and runs on round numbers. Every market number around it is documented: the Federal Reserve's own rate decisions, the daily SOFR prints published by the New York Fed, Chatham Financial's published rate-cap pricing, and Freddie Mac Multifamily's January 2024 maturity-risk research.

The plan was the most ordinary plan in the business. Buy a 1980s 200-unit complex for $30M at a 4.5% going-in cap rate, renovate units as tenants move out, raise rents, and sell the improved income stream three years later at a similar cap rate. Fund it with a three-year interest-only bridge loan floating over 30-day Average SOFR plus 350 basis points. With overnight SOFR printing as low as 0.05% that year, debt service was almost free.

Three assumptions, and the quiet one

From the inside, the deal needed three things to hold. Rates would stay low, or the lender-required rate cap would keep protecting. The renovations would lift income enough to refinance. And the building would sell at roughly the cap rate it was bought at.

The first two were discussed constantly, because they are the ones the model puts in front of you. The third was a single cell. Underwriting an exit at the going-in cap rate does not feel like an assumption at all, it feels like using observed market pricing instead of guessing, which is what a careful person is supposed to do. The problem is what that pricing rested on. By the third quarter of 2023 the multifamily cap-rate spread over the ten-year Treasury sat at 120 basis points against a 310 basis point average going back to 2001. So a 4.5% cap in 2021 was not a cushion at all. It was a wager that the narrowest spread in twenty years would hold.

The required interest rate cap had a similar quiet feature. Its strike was set so that capped debt service would clear a 1.0x coverage test against the business plan's projected stabilized income, not against the income the building was producing on the day it was bought.

The insurance repriced with the disaster

Then the Fed moved its target range from 0 to 0.25% up to 5.25 to 5.50% across eleven meetings between March 2022 and July 2023, and overnight SOFR followed: 0.05% on 3 January 2022, 5.31% on 31 July 2023. On the composite's $21M interest-only loan, that is the difference between $745,500 of annual interest and $1,850,100.

The cap did its job. Holding the index at a 3.00% strike put interest at $1,365,000 against $1,420,000 of net operating income, a debt service coverage ratio of 1.04x. The loan stayed current and paid essentially nothing to anybody. Meanwhile the income side stalled for reasons outside the building: same-store rents grew 0.4% year over year in the third quarter of 2023 while operating expenses grew 7.2%, against a 3.9% average since 2010.

The failure lived in the words three-year. A rate cap is term insurance, and its renewal is priced off the same forward curve that made it necessary, so it costs the most exactly when it has proved most useful. Chatham's published pricing shows the scale: a two-year cap on a $25M loan struck at 4% cost about $97,000 in February 2022 and about $569,000 in March 2023. Nothing in the deal's cash flow had been reserved against that. When the cap expired in early 2024 no refinance cleared, apartment values sat 14% below their July 2022 high, and the sale that followed repaid the lender and returned roughly a third of the equity.

An interest rate is a position, not a cost line

The transferable idea is that on a leveraged asset the interest rate is not a line item you pay, it is a market position you hold, and a floating rate means you are holding it. That is fine when it is deliberate and sized. It stops being fine when a hedge with an expiry date gets treated as though it had converted the loan to fixed.

Three habits follow, and none of them requires a forecast. Underwrite the exit wider than the entry, because a plan that only works if you sell at today's pricing is a bet on today's pricing. Put the hedge's renewal cost into the model on day one, priced as though rates had already moved, since that is the only world in which you will be buying it. And when a deal pencils only at a historically extreme spread, say so out loud, because a deal that needs an unusual condition to persist is a bet on that condition.

The uncomfortable part is that this discipline mostly shows up as deals you did not do. That is the feature. It is also why it is so rarely popular in the year it matters.

Timeline

• Mid-2021 Buys a 1980s 200-unit complex for $30M at a 4.5% going-in cap rate. Funded with a three-year interest-only bridge loan floating over 30-day Average SOFR plus 350 bps. Overnight SOFR that year printed as low as 0.05%, so debt service was almost free.
• At closing The lender requires a three-year interest rate cap, an insurance policy that pays the borrower whenever the index rises above a strike rate. The strike is set so that capped debt service clears a 1.0x coverage test against the business plan's projected stabilized income, not against the income the building produced that day.
• Mar 2022 – Jul 2023 The Fed raises the target range from 0–0.25% to 5.25–5.50% across eleven meetings. Overnight SOFR follows: 0.05% on 3 January 2022, 5.31% on 31 July 2023.
• 2023 The cap goes into the money and starts paying, and it is the only reason the loan is still current. Meanwhile the income side stalls: same-store rents grew 0.4% year over year in Q3 2023 while operating expenses grew 7.2%, against a 3.9% average since 2010 (RealPage figures, per Freddie Mac).
• Early 2024 The three-year cap expires. Freddie Mac notes that caps are generally bought as a three-year plan at origination and renewed as two-year plans. The renewal is priced off the same forward curve that caused the problem, and it costs multiples of the original.
• Mid-2024 No refinance clears. Apartment values sit 14% below their July 2022 high (Real Capital Analytics, per Freddie Mac). The sponsor sells; the lender is paid; roughly two-thirds of the equity is gone.

You're in the owner's chair

Mid-2021. The deal pencils beautifully on a three-year floating bridge loan at SOFR plus 350: the index is 0.05%, so debt service is trivial and the projected return is the best you have ever modeled. Agency fixed-rate debt is available at a higher current cost and lower proceeds. Which version do you sign?

• Take the bridge loan, underwrite the exit 100 bps wide, buy the lowest cap strike
• Take the bridge loan and buy the cheapest cap that satisfies the lender
• Take the bridge loan and underwrite the exit at the going-in cap rate — that is what every comparable sale supports

One input, one building, three futures

• Net operating income the building actually produced (2023): 1,420 $000 per year
• Interest at 2021's SOFR of 0.05% (all-in 3.55%): 746 $000 per year
• Interest with the cap holding the index at its 3.00% strike: 1,365 $000 per year
• Interest if the cap had lapsed (SOFR 5.31%, all-in 8.81%): 1,850 $000 per year

Illustrative arithmetic on a $21M interest-only loan at 30-day Average SOFR plus 350 bps. The index values are the real overnight SOFR prints published by the New York Fed: 0.05% on 3 January 2022 and 5.31% on 31 July 2023.

Business model

Buy an older apartment building below replacement cost, renovate units as tenants roll, raise rents, and sell the improved income stream at a similar cap rate three years later. The building is the product; the loan is the leverage that turns a modest income gain into a large equity gain, and, in the other direction, a modest income miss into a total one.

Revenue model

Monthly rent from 200 units, plus fees. At a $30M price and a 4.5% going-in cap rate the building produced about $1.35M of net operating income. Renovations lifted that to roughly $1.42M by 2023, real progress on the business plan, and nowhere near enough.

Cost structure

Operating costs (taxes, insurance, payroll, turns, utilities) and one line that behaves differently from all the others: interest. On a $21M interest-only loan at SOFR plus 350 bps, 2021's index of 0.05% meant $745,500 a year, a 1.81x coverage ratio. At 2023's 5.31%, the same loan would have cost $1,850,100. The cap held the effective rate at a 3.00% strike, so interest landed at $1,365,000 against $1,420,000 of income. Coverage of 1.04x. Alive, and paying nothing to anyone.

Strategic challenge

Three assumptions had to hold and only one had to break. The rate would stay low, or the cap would keep protecting; the business plan would lift income enough to refinance; and the exit cap rate would resemble the going-in cap rate. The third was the quiet one. In Q3 2023 the multifamily cap-rate spread over the 10-year Treasury sat at 120 bps against a 310 bps average going back to 2001 (Freddie Mac). Buying at a 4.5% cap in 2021 was not buying a cushion. It was buying a bet that the thinnest spread in two decades would stay thin.

Key decision

The decision that decided it was made at the offer, not at the crisis: underwriting the sale at the same cap rate as the purchase. Everything after, whether the cap strike, the extension request, or the sale, was arithmetic already fixed in 2021. Underwriting the exit even 100 bps wide of going-in would have killed the deal at the bid stage, which is exactly what it was supposed to do.

What worked

The operating plan. Units were renovated, rents rose, and income grew about 5% over two years in a market where same-store rent growth had fallen to 0.4%. The sponsor also bought a genuinely low strike rather than the cheapest cap the lender would accept, which is the single reason the loan stayed current through 2023 instead of defaulting in it.

What failed

The hedge was term insurance, and everyone treated it as coverage. A rate cap protects for a fixed number of years and then must be re-bought at a price set by the forward curve, so it is most expensive precisely when it has been most useful. Chatham Financial's published pricing makes the scale plain: a two-year cap on a $25M loan struck at 4% cost about $97,000 in February 2022 and about $569,000 in March 2023. Nothing in the deal's cash flow was reserved against that.

Risk factors

Floating-rate debt with no fixed-rate takeout; a hedge whose renewal cost correlates with the risk it hedges; an exit cap rate assumed rather than stressed; interest-only debt that never amortizes toward a refinanceable balance; and concentration, because roughly $500B of multifamily loans mature in 2024–2025, about 42% of all commercial real estate maturities, so every distressed seller meets the same buyers at once.

Lesson summary

In a leveraged deal the interest rate is not a cost line, it is a market position, and a rate cap is a policy with an expiry date, not a fixed rate. Underwrite the exit cap rate wider than the going-in cap rate, price the cap renewal into the model on day one, and treat any deal that only works at a historically thin spread as a bet on that spread, because that is what it is.

Key data

• 0.05% → 5.31% (FRED) Overnight SOFR, 3 Jan 2022 → 31 Jul 2023
• 0–0.25% → 5.25–5.50% Fed target range, Mar 2022 → Jul 2023
• ~$97k (Feb 2022) → ~$569k (Mar 2023) Two-year cap, $25M loan, 4% strike
• 120 bps (Q3 2023) vs 310 bps average since 2001 Multifamily cap-rate spread over 10-yr Treasury
• −14% (RCA, per Freddie Mac) Apartment values vs their July 2022 high
• ~$500B — about 42% of all CRE maturities Multifamily maturities, 2024–2025

Sources & basis

The business in this story is a stand-in, not a company you can look up. This case is an illustrative composite: the operator, the people and most of the dollar figures represent a pattern rather than reporting one firm's history. What the list below cites is the other half, the documented industry data and public reporting the composite was assembled from, including any real company whose published figures the case draws on by name. The mechanism and the arithmetic are real even where the business is not.

1. SOFR daily series (Federal Reserve Bank of New York), full history as published by FRED — St. Louis Fed: 0.05% on 3 Jan 2022, 5.31% on 31 Jul 2023 View source ↗
2. Federal Reserve — Open Market Operations, federal funds target rate decisions 2020–2023 View source ↗
3. Freddie Mac Multifamily, "Multifamily Maturity Risk" (January 2024) — cap-rate spread, RCA price index, RealPage rent and expense growth, maturity volumes, and the definition and renewal terms of interest rate caps View source ↗
4. Commercial Observer, "Rising Interest Rate Cap Costs Pressure CRE Borrowers" (March 2023), citing Chatham Financial pricing View source ↗
5. Composite sponsor and property-level arithmetic — illustrative, on round numbers; see the Real Estate and Risk categories