Two multifamily deals can show you the same 18% projected IRR on paper. Yet one might carry a fixed-rate agency loan with a decade of payment certainty, while the other rides a floating-rate bridge loan that resets every month with the market. The return numbers look identical, though the risk underneath them isn’t.
Accredited investors already know how to read a preferred return or size up a GP’s track record. Fewer stop to ask how a sponsor finances the deal itself, and that gap cost plenty of experienced investors dearly between 2022 and 2024, when rates rose faster than almost anyone underwrote for. This isn’t a story about which operators were good or bad — debt structure alone caught many disciplined sponsors, not poor execution.
This guide walks through what to actually look for: how fixed and floating debt differ, why rate caps matter more than most investors realize, and the specific questions worth asking before you wire capital into your next deal.
Fixed-Rate vs. Floating-Rate Debt, Explained
Multifamily loans generally fall into two camps, and the difference matters more than most offering memorandums make it sound.
How Each Type Works
Fixed-rate debt — usually agency financing through Fannie Mae or Freddie Mac — locks in an interest rate for the full loan term. Your debt service stays predictable from closing to exit, regardless of what happens in the broader rate environment.
Floating-rate debt moves with an index, historically LIBOR and now SOFR. Bridge loans and many bank loans use this structure, so the payment rises and falls as the index does. A sponsor might underwrite a floating loan at 3.5%, but nothing guarantees it stays there.
Why Sponsors Choose One Over the Other
Leverage explains most of the decision. Bridge lenders will often go up to 80% loan-to-cost, while agency lenders typically cap out around 65%. Consequently, a sponsor using bridge debt needs less LP equity to close the same deal, and that shows up as a higher headline return in the projections.
Consider a $20 million acquisition. At 65% agency leverage, a sponsor needs to raise roughly $7 million in equity, while 80% bridge leverage on the same deal requires only about $4 million — capital that’s now free for the next deal, or that simply boosts the return math on this one. That gap explains why bridge debt became the default choice for aggressive value-add strategies during the low-rate years, even though it shifted real risk onto the LPs writing the checks.
Fixed-rate agency debt trades that leverage for certainty. It generally requires more equity upfront, but the payment doesn’t move regardless of what the Fed does next.
Neither structure is automatically the wrong choice. The real question is whether you, as the investor, can see the tradeoff clearly before you commit capital — and whether the sponsor is transparent about which one they’re using and why.
Why Floating-Rate Debt Became the Default After COVID
Following the Fed’s near-zero rate policy through 2020 and 2021, SOFR effectively cost lenders nothing to fund, and bridge loans priced accordingly around 3% to 3.5%. Sponsors could suddenly access historically cheap leverage precisely when transaction volume surged past $400 billion industry-wide.
Higher leverage also mattered competitively, not just financially. With capital flooding into multifamily and cap rates compressing, agency-financed buyers offering 65% leverage often lost bids to bridge-financed buyers who could offer sellers better terms.
Consequently, the standard value-add approach crystallized around a repeatable formula: acquire with floating-rate bridge debt, renovate units and push rents over 18 to 24 months, then refinance into permanent fixed-rate agency debt once the property stabilized. Cheap floating debt and cheap rate caps made the approach look low-risk, since a two- or three-year rate cap cost as little as $30,000 at the time.
That formula worked as designed as long as rents kept climbing and rates stayed low. Once the Fed began raising rates through 2022 and 2023, both assumptions broke at the same time, and the same structure that had made deals competitive became the primary source of stress across the industry.
Rate Caps: The Detail Most Investors Skip
If a deal uses floating-rate debt, a rate cap should come with it. Unfortunately, most retail investors never ask what that cap actually covers.
A rate cap doesn’t protect against the rate rising — it protects against the rate rising past a specific strike price. Above that price, the cap provider absorbs the difference. Below the strike price, floating-rate risk still applies to you, just like any other borrower.
The cap’s term matters just as much as its strike price. A two-year cap on a three-year loan leaves a gap most investors never notice until it’s too late. During 2021, a typical rate cap cost roughly $30,000 (source). By 2023, renewing that same cap could cost well over $1 million, because the cost of protection rises right alongside the risk it’s protecting against.
Before you invest, ask three things: What’s the strike price on the rate cap? When does it expire relative to both the loan maturity and the business plan timeline? And who covers the cost of renewing the cap if it’s needed mid-hold?
How to Read Debt Structure in an Offering Memorandum
Most offering memorandums bury debt terms several pages past the return projections. That’s exactly where you should look first, not last.
Start with the capital stack section and check five things: loan type (agency, bridge, or bank), rate type (fixed or floating), term and maturity date, leverage (loan-to-cost or loan-to-value), and whether the loan is interest-only or amortizing. Each answer tells you something the IRR slide won’t.
Then, run a simple stress test yourself. Ask what happens to debt service if the exit or refinance slips 12 to 18 months past the sponsor’s plan. If a sponsor can’t answer that question clearly, that’s worth noting on its own. This same discipline applies to reading a deal’s T-12, rent roll, and pro forma — debt structure is simply the next layer down.
Why This Matters Right Now
Roughly $162 billion in multifamily loans mature in 2026 alone. That means a meaningful share of the market is working through refinancing decisions at this very moment, often under rate conditions the original underwriting never anticipated.
Current commercial mortgage rates sit in the high-5% to low-6% range as of this writing. Compare that to the rates sponsors underwrote into many bridge loans three or four years ago, and the gap explains a lot of what’s happened across the industry since.
Assumable agency debt has also become a bigger differentiator during this stretch, since a buyer who can step into an existing low-rate loan avoids originating new debt at today’s rates entirely. That single feature can meaningfully change a property’s marketability at exit, and it’s worth asking whether the loan you’re underwriting includes it.
None of this means floating-rate debt is inherently reckless, and it doesn’t mean every fixed-rate deal is safe. It means you now have enough context to ask sharper questions about any deal in front of you, including how it compares to the more conservative structure our earlier explainer on bridge debt vs. agency debt covers.
Questions to Ask Before You Invest
Bring this list to your next call with a sponsor:
- Is this loan fixed or floating, and if floating, is a rate cap in place for the entire loan term?
- What’s the leverage, and how does it compare to a more conservative agency-financed structure?
- When does the loan mature relative to the projected hold period?
- Is the debt assumable, and would that matter to a future buyer?
- What’s the plan if refinancing conditions look worse than underwritten?
A sponsor who answers these clearly, without hedging, has usually thought this through. One who can’t should give you pause before you decide anything else.
This kind of scrutiny fits naturally alongside the broader diligence process, including the questions every investor should ask before investing in a syndication and how institutional investors evaluate a sponsor’s underwriting.
What This Means for Your Next Deal
A pro forma tells you what a sponsor expects to happen. Debt structure tells you what happens if they’re wrong, and every plan eventually needs one. The two matter equally, even though only one of them gets top billing in most offering memorandums.
Before your next investment, spend as much time reviewing the capital stack as you spend reviewing the return projections.
FAQs (Frequently Asked Questions)
Agency debt comes from Fannie Mae or Freddie Mac, offers fixed rates, and requires a stabilized, occupied property. Bridge debt is short-term, usually floating-rate financing that sponsors use for value-add deals before a property qualifies for permanent financing.
A rate cap limits how high a floating interest rate can rise during the loan term. Lenders typically require one on floating-rate loans so the borrower’s debt service can’t spiral beyond a set ceiling, though the cap only protects above its strike price.
Not automatically. Floating debt carries real interest-rate risk, but it also allows higher leverage and faster execution on value-add deals. The risk depends on how well a sponsor manages that exposure with rate caps and a realistic hold timeline.
There’s no universal number, but leverage above 75-80% loan-to-cost leaves little room for error if rents grow slower than projected or rates move against the deal. Lower leverage costs more equity upfront but gives a deal more room to absorb a rough stretch.
The sponsor typically needs to extend the loan, secure bridge-to-bridge financing, or raise additional capital through a capital call. Whether that’s a manageable event or a real problem depends heavily on how conservatively the sponsor leveraged the deal from the start.
Most institutional-quality multifamily loans, including agency and many bridge loans, are non-recourse to the LPs — limited partners aren’t personally liable beyond their invested capital if a deal defaults. The general partner, however, often signs standard carve-out guarantees (sometimes called “bad boy” guarantees) that create personal liability for specific bad-faith actions like fraud, not for ordinary underperformance. It’s worth confirming this structure directly rather than assuming it, since terms vary by lender and deal.