The multifamily market is handing us a gift wrapped in red tape.
While everyone’s complaining (and rightfully so) about 6-7% rates on 30-year fixed residential mortgages—and commercial loans hovering at 5-6.5%—there’s actually a parallel universe where 3-4% financing still exists.
And that starts with assumable agency debt.
Case in point: we just locked in Summit 401 with a blended rate of 4.68%—assuming the seller’s 3.01% agency loan and adding a supplemental at 7.19%. Full P&I, building equity with every payment, at rates our competition can’t touch with new financing.
That’s assumable agency debt at work.
Thousands of properties still carry these 2020-2022 vintage loans, but the window’s closing fast. Every month brings more refinancings and trades, and taking below-market debt off the table with it. Smart sellers are already pricing this advantage into their asks, and savvy buyers are winning deals while others get stuck running outdated numbers.
Not for long.
The mechanics aren’t rocket science, but the details and execution matter—and that’s what our focus is this month.
The Background: What Assumable Fixed-Rate Debt Actually Means
Most real estate investors throw around “assumable debt” like they know what it means. Chances are they don’t. Half think it’s some exotic financing trick, the other half confuse it with subject-to-deals their wholesaler buddy pitched them. So let’s cut through the noise and explain what makes these loans the secret weapon they’ve become and why agencies like Fannie Mae and Freddie Mac built this feature into their programs long before anyone cared.
Which Agency Loans Allow Assumptions
An assumable loan lets a qualified buyer take over the seller’s existing mortgage—same rate, same terms, same monthly payment. You’re literally stepping into their shoes, debt-wise.
Fannie Mae’s DUS program and Freddie Mac’s Optigo platform both offer fixed-rate loans (typically 5 to 10-year terms with 30-year amortization) that come with assumption rights baked in.
HUD takes it further with its 223(f) loans. These are 35 to 40-year fully amortizing beasts that practically beg to be assumed at their rock-bottom 0.05% transfer fee.
Even CMBS loans often join the party, though they’ll hit you with a 1% assumption fee just to avoid the defeasance nightmare.
The point? These aren’t obscure products.
The Real Costs and Timeline for Taking Over These Loans
Here’s where reality meets opportunity. Agency assumptions typically run about 1% of the unpaid balance. Now, while that’s real money, it’s peanuts compared to the rate savings. HUD wins the fee war at 0.05%, making their loans almost criminally cheap to assume. You’ll also eat legal costs and go through full credit underwriting, because lenders aren’t stupid.
They want to know you can handle the payment, even at these gift rates.
The approval process feels like applying for a new loan because, technically, you are. The difference, though, is that you already know the terms you’re getting, and they’re terms nobody else can offer today.
Key Features That Transfer (And Why They Matter)
The beautiful part about assumptions lies in what survives the handoff.
All the good stuff transfers intact. Non-recourse protection (with standard bad-boy carve-outs) stays in place. Interest-only periods carry over to the new owner. And prepayment penalties like yield maintenance or defeasance follow the loan, not the seller.
Perhaps that’s why sellers prefer assumptions to paying six-figure exit fees.
There is one major caveat, though: Fannie and Freddie “fixed-rate” loans aren’t 30-year fixed mortgages like your house. They’re 5-10 year terms with 30-year amortization schedules. HUD’s the outlier with true long-term fixed rates that amortize fully.
Know what you’re assuming, because that balloon payment doesn’t care about your business plan.
The Present Climate: Why Assumable Debt Became a Hot Topic
Now that you understand what assumable debt is, let’s talk about why every broker, lender, and investor suddenly cares.
Originations Are Back (But The Rates Aren’t)
Commercial and multifamily mortgage originations jumped 42% year-over-year in Q1 2025. Sounds great until you realize what they’re originating at—mid-6% rates that make 2021 deals look like fantasy.
The agencies keep pumping capital with FHFA setting 2025 multifamily purchase caps at $73 billion each for Fannie Mae and Freddie Mac. That’s $146 billion total ready to deploy, including for assumptions and supplemental loans.
The irony? All this fresh capital comes at rates that make assumable 3% debt look like buried treasure. Lenders are busy, deals are happening, but everyone’s searching for workarounds.
The $957 Billion Maturity Wall Forces Everyone’s Hand
Here comes the catalyst: roughly $957 billion of CRE mortgages mature in 2025.
That’s 20% of all outstanding commercial real estate debt hitting its balloon date at once. Freddie Mac estimates explicitly that about 42% of 2024-2025 CRE maturities are multifamily. In other words, that’s $500 billion worth of apartment loans that need answers.
What’s more, GSE maturities only represent 13-18% of that wall. The rest are CMBS, bank loans, and other non-agency debt, where assumption gets messy or impossible.
Those borrowers face the full brunt of today’s rates, while agency loan holders sit on transferable gold.
The Numbers That Make Deals Work (Or Not)
The spread between yesterday and today tells the whole story.
Properties financed in 2020-2021 locked in sub-3.5% coupons when money was basically free. Today’s 5-6.5% environment changes everything about deal economics. A 300 basis point spread can really impact your cash-on-cash returns, debt coverage ratios, and exit strategies, for instance.
Take Summit 401 again—that 3.01% assumed rate versus 5-6.5% on new commercial financing means hundreds of thousands in annual cash flow difference. Multiply that across a portfolio, and you understand why assumable debt went from footnote to headline. The pricing gap creates arbitrage opportunities that make good deals great and impossible deals possible.
The Mechanics: How Assumable Debt Works
So what actually happens when someone assumes agency debt? The process of how these deals come together looks deceptively simple until you see all the moving parts, step by step.
- The Starting Point: A property has an existing fixed-rate agency loan—typically 30-year amortization, non-recourse, maybe some interest-only years left. These 2020-2021 vintage loans carry 3-3.5% rates while today’s 10-year money prices hover around 6%.
- The Assumption Transfer: The buyer steps into the seller’s exact loan position—same rate, same balance, same remaining term. The original loan doesn’t change; only the borrower’s name and guarantors switch through lender-approved documentation.
- The Supplemental Layer: Most buyers need more debt than what’s assumable. Agencies provide supplemental loans at current market rates that sit behind the assumed first mortgage. The assumed 3% first plus a 7% supplemental creates a blended rate in the high 4s. But who’s complaining? It still beats new financing.
- The Numbers in Action: On a $10 million deal with $600k NOI, assuming $7 million at 3% interest-only costs $210k annually. New debt anywhere between 5% and 6.5% could run $455k. That $245k difference flows straight to cash—equivalent to 2.45% of the purchase price every year.
- The Approval Process: Agencies re-underwrite the new borrower against current standards—net worth, liquidity, track record. Servicers prepare transfer documents while lawyers negotiate assumption agreements. The whole process takes 60-90 days if everything goes smoothly, longer when complications arise.
What Can Get in the Way: The Fine Print Nobody Mentions
Here’s the hard part, though. Assumable debt sounds like free money until you realize agencies still have standards—and they’re not handing these loans to anyone with a pulse and a PowerPoint.
- Leverage Limits That Bite: Freddie’s fixed-rate loans max out at 80% LTV and require 1.25x DSCR on amortizing debt, with even tighter rules for interest-only. Your plan to assume that 3% loan falls apart if the property’s current NOI can’t support the existing payment at today’s coverage requirements.
- Buyer Qualification Theater: Agencies put assuming sponsors through an underwriting gauntlet. Fannie wants to see your net worth and post-closing liquidity meet their minimums, while Freddie’s rejection pile grows from sponsors who thought their crypto portfolio counted as liquid assets.
- Banks Playing Hardball: The Fed’s April 2025 SLOOS report shows banks continue tightening CRE terms—lower LTVs, higher DSCRs, more recourse. Makes agency assumptions look even better, assuming you can clear their hurdles first.
- The Assumption Fee Surprise: HUD publishes its 0.05% fee like they’re proud of it. Agency and CMBS lenders keep their fees mysterious until you’re deep in due diligence—expect around 1% but prepare for servicer creativity.
- Timeline Reality Check: Formal consent, legal reviews, servicer counsel, transfer documents—the assumption closing checklist reads like a law school exam. So you better have all your ducks in a row.
Tying It All Together: The Assumable Debt Playbook
We’ve covered the what, how, and why of assumable debt. Now, let’s connect the dots on why this strategy went from niche to necessary. The convergence of rate spreads, maturity walls, and desperate sellers created a rare arbitrage window—one that smart operators are racing to exploit before the market catches up.
Why Operators (and Investors) Care
Assumable debt changes the entire game, and operators figured this out fast. First, positive leverage finally exists again. Buying a 6% cap property with 3% debt means every dollar works for equity, not the bank. The math is beautiful in its simplicity.
The cash flow difference hits accounts immediately, too. Take a $25 million property with interest-only debt—the spread between 3% and 5%-6.5% could generate up to an extra $875,000 annually. That’s not projections or hockey-stick rent growth. That’s real money on day one for improvements, distributions, or just sleeping better at night.
Then there’s the refinance problem that disappears. While others sweat balloon payments with 42% of multifamily loans maturing soon, assumable debt holders sit pretty with rates locked from better days.
Even better, sellers facing massive prepayment penalties need assumption buyers desperately. Sellers avoid six-figure defeasance costs, buyers get favorable terms—everybody wins except the competition, still shopping for new agency debt at 5-5.5% or bridge financing at 6-6.5%.
Why Now?
The opportunity exists because several forces collided at once. Banks keep tightening their lending requirements while the agencies sit on $146 billion ready to fund deals. The market’s waking up too—remember, loan originations jumped 42% year-over-year in Q1 2025, creating more assumption opportunities as deals start moving again.
The loan structures line up perfectly with most business plans. Those 5-10 year agency terms work for value-add plays, while HUD’s longer-term loans suit buy-and-hold strategies. Both Fannie and Freddie let you add supplemental debt without touching that beautiful first mortgage, so you can get the leverage you need at blended rates that still beat the market.
Here’s the catch, though: every month, more of these low-rate loans disappear. Some refinance, others sell to cash buyers, and each one that vanishes is gone forever. The 2020-2021 vintage won’t replicate itself. Once these loans are gone, they’re gone. Summit 401 proved the model works. The question is how many more deals you can capture before the window closes.
Why This Strategy Works and How We Use It at RSN
We used to compete on the same terms as everyone else—fighting over cap rates, arguing about renovation budgets, promising better operations.
Frankly, Summit 401 changed our perspective: while all buyers had the option to assume the loan, we locked in 4.68% blended financing while our competition submitted offers based on new financing at 5-6.5%. Compared to similar properties we were considering, the returns were much higher. They couldn’t make the numbers work. We closed.
Now we scan every OM for that one line about existing debt. We call brokers specifically asking about assumable loans. We’ve built relationships with servicers who return calls. Because when you find a property with 3% debt from 2021, you’ve found something nobody else can replicate.
Sellers get it now, too. They know their low-rate loan has value. Some price it in, others just want the certainty of closing without prepayment penalties. Either way, we’re having different conversations than we were two years ago. We’re solving problems instead of bidding higher.
These opportunities disappear daily. Every refinanced loan, every cash sale—that’s one less chance at below-market debt. We’re grabbing what we can while it lasts, because boring loan assumptions turned into our most exciting returns.
Happy Investing!
Reed Goossens is an Australian-born real estate entrepreneur, investor, author, public speaker, and an all-around good bloke. Reed got his start in real estate investing back in 2012 when he moved to the US.
