Prepayment Analysis: Yield Maintenance, Defeasance, Step-Down, and Open — Across Every Debt Type

Key Takeaways

The Prepayment Decision

Most borrowers don't price prepayment penalty until they need to exit, and by then it's too late to change. The commitment is signed, the regime is locked in, and the cost is whatever the Treasury curve says it is on the day the calculation runs. The institutional discipline — the one that separates capital markets desks from sponsors who learned the math by surprise — is to price prepayment before selecting a lender, on the same exit-year assumption across every term sheet on the table.

This article is the cross-lender prepayment methodology. CMBS-specific yield maintenance and defeasance — the formula derivations, the master-servicer workflow, the 2026 negative-defeasance window — live in the sibling deep-dive: CMBS Prepayment: Conduit vs SASB, Yield Maintenance, and Defeasance. This piece takes the broader view: defeasance and yield maintenance are two of five prepayment regimes, and each of the five attaches to a specific set of lender types. The reader who understands all five regimes can price prepayment on agency, life co, bank, CMBS, bridge, HUD, and SBA debt on a single comparable basis.

Before going further: this article is about institutional commercial real estate prepayment, not the consumer-mortgage "prepayment penalty" that the CFPB, Bankrate, and Rocket Mortgage write about. Consumer mortgages in most U.S. states have no prepayment penalty after the first 1–3 years (per the CFPB ATR/QM rule). Institutional CRE debt operates under entirely different conventions — lockouts, yield-maintenance formulas, Treasury-portfolio substitution, step-down schedules — that protect institutional bondholders rather than individual consumers. If you arrived here looking for residential mortgage prepayment information, the Consumer Financial Protection Bureau (consumerfinance.gov) is the better resource. Everything below assumes institutional CRE debt at $5M–$500M+.

The Five Prepayment Regimes

Every institutional CRE loan's prepayment structure resolves to one of five regimes — or, more commonly, a phased combination of them across the loan's life:

1. Open prepayment

The simplest regime: the borrower can prepay at par with no penalty. Bridge loans typically allow open prepayment after a minimum interest period (3–6 months). Most agency multifamily loans allow open prepayment in the last 3–6 months before maturity. Some bank balance-sheet loans allow open prepayment throughout the term, particularly relationship credit facilities and lines that the bank prices for refinance flexibility. The trade-off: open prepayment usually correlates with higher coupons or shorter terms.

2. Step-down (declining penalty schedule)

The borrower pays a declining percentage of the principal balance as a penalty, with the percentage falling each year of the loan's life. The classic schedule is 5-4-3-2-1: 5% penalty in Year 1, 4% in Year 2, 3% in Year 3, 2% in Year 4, 1% in Year 5, then open. Agency multifamily uses step-down on most products; HUD 223(f) uses a 10-year declining schedule (5-4-3-2-1 across the first five years, then open or 1%/year through Year 10 depending on vintage); SBA 504 uses a 10-year step-down (5-4-3-2-1-0.5-0.5-0.5-0.5-0.5). Bank balance-sheet loans occasionally use step-down for floating-rate term loans where the bank wants some prepayment protection without the operational complexity of YM or defeasance.

3. Yield maintenance

The borrower pays the lender the present value of the lender's lost coupon, computed at a reinvestment rate equal to the current Treasury yield for a maturity matching the remaining term, plus a small make-whole spread (typically 25–50 bps). The payment makes the lender whole — the lender can take the prepayment proceeds, reinvest them at the current Treasury rate, and receive the same total cash flow they would have received from the loan. Life insurance companies use yield maintenance almost universally. CMBS SASB structures often negotiate to YM (rather than defeasance). Some bank construction-to-perm loans convert to YM at conversion. The math is closed-form and quotable on a phone call; the cost is highly sensitive to the gap between loan coupon and current Treasury yield.

4. Defeasance

The borrower substitutes a portfolio of U.S. Treasury or agency securities that replicates the loan's remaining cash flow. The lender keeps receiving the same scheduled payments — only now from the Treasury portfolio rather than the underlying property. The borrower's collateral (the property) is released; the new collateral is the security portfolio. Defeasance is almost exclusively a CMBS conduit phenomenon. It exists because pooled CMBS investors require the loan's cash flow to remain in the trust to support the rated bonds; they can't accept prepayment proceeds that disrupt the bond cash flow schedule. Operationally it is the heaviest regime: it requires a defeasance consultant, the master servicer's cooperation, a securities broker, counsel, a trustee, and typically 30–45 days of execution time.

5. Prepayment lockout

The borrower is prohibited from prepaying for a defined window — typically 24 months on CMBS conduit, sometimes 36 months on SASB, and occasionally the entire loan term on portfolio life co loans with high-conviction long-duration matching. During lockout the borrower simply cannot exit at any price; the only options are to hold to the end of the lockout or to negotiate a discounted payoff with the lender (which is a workout, not a prepayment). Lockout is the strictest regime because it removes the option entirely rather than pricing it.

Which Debt Type Uses Which

The cross-lender map is the load-bearing reference for institutional borrowers. Different lender types use different regimes for structural reasons that connect to how the underlying capital is held and how the bondholders or balance-sheet owners think about reinvestment risk. The matrix below is the Q2 2026 institutional baseline; each row is the standard provision, with notes on common variations.

Reading the matrix in narrative form: agency multifamily (Fannie Mae DUS, Freddie Mac Optigo) uses step-down on most products with a YM variant on flexible-prepayment offerings and an open period in the last 3–6 months — per the Fannie Mae Multifamily Selling and Servicing Guide, each loan selects between a declining-percentage prepayment premium or a yield-maintenance premium at origination.

Life insurance companies use YM almost universally because life cos hold these loans on the general account to match long-duration insurance liabilities, and YM compensates precisely for the lost coupon on early exit. Some portfolio-matched life co loans add a long initial lockout (36–60 months) on top of YM. Commercial banks on balance-sheet permanent loans typically allow open prepayment; step-down or YM appears on fixed-rate term loans or floating-rate loans swapped to fixed (where the swap has a separate breakage cost that mirrors YM mechanically through the swap MTM).

CMBS conduit uses defeasance by market convention — the standard since the early 2000s for pooled securitizations. CMBS SASB ($200M+ single-asset deals) negotiates, typically with yield maintenance rather than defeasance because SASB bondholders have less diversification need than conduit investors. SASB issuance reached roughly 45% of CMBS volume in 2024–2025 per Structured Finance Association research. Bridge and transitional loans use a minimum interest period (3–6 months) plus an exit fee (50–100 bps), then open — bridge lenders price prepayment flexibility into the upfront economics rather than the back end.

HUD 223(f) and 221(d)(4) use a declining step-down schedule after a two-year lockout (5-4-3-2-1 over the first five post-lockout years, then a small fixed premium or open period through maturity, varying by vintage). SBA 504 — relevant as an institutional analogy — uses a 10-year CDC debenture step-down (5-4-3-2-1-0.5-0.5-0.5-0.5-0.5) that mirrors agency multifamily.

Yield Maintenance: The Math

Yield maintenance pays the lender the present value of the lost coupon between today and the loan's maturity. The closed-form formula in its institutional convention:

The key feature: YM cost rises when rates fall and falls when rates rise. A life co loan originated in 2014 at a 4.5% coupon had near-zero YM in 2020–2021 (rates near 0.5–1.0% — YM was enormous) and has near-zero YM in 2026 (current 5-year UST at 4.25% sits above most 2014-vintage coupons). The institutional borrower exiting a loan at the bottom of the rate cycle pays the most YM; the borrower exiting at the top pays the least.

Work a concrete example. $30M life co loan, 5 years into a 10-year term, 4.50% coupon, 30-year amortization. Remaining principal at Year 5: roughly $27.5M (a 30-year-amortizing loan retires about 8.3% of the original balance in the first five years, depending on the exact rate). The remaining 60 months of scheduled payments total approximately $34.9M (60 monthly P&I payments at the original coupon plus the Year-10 balloon). The current 5-year Treasury yield is 4.10% (a mid-2026 snapshot); the make-whole spread in the loan document is 25 bps, so the YM discount rate is 4.35%.

• PV of remaining 60 months at the loan coupon, discounted at 4.35% YM rate = $27.93M
• Less par balance = $27.50M
• YM penalty = $0.43M (roughly 1.6% of balance)

On the same loan with the 5-year Treasury at 2.00% (the 2020–2021 environment), the YM discount rate would have been 2.25%, the PV would have been roughly $30.2M, and the YM penalty would have been roughly $2.7M — about 10% of balance. Same loan, same remaining term, same coupon, six times the prepayment cost in the lower-rate environment. This is the institutional intuition: YM cost is dominated by the gap between the loan coupon and the current Treasury yield, not by the loan-document mechanics. The make-whole spread is a small modifier; the curve is the variable.

The Treasury yield used in the calculation comes from the Federal Reserve's H.15 daily yield curve, interpolated to the loan's remaining tenor. Most loan documents specify the calculation date as the date of prepayment notice (typically 30–90 days before actual prepayment); the rate that day — not the average over the loan's life or any forecast — is the rate that governs.

Defeasance: The Math

Defeasance substitutes a portfolio of U.S. Treasury or agency securities for the property as collateral. The securities are selected to throw off cash flows that exactly match the loan's remaining schedule — the monthly P&I payments plus the balloon at maturity. The lender keeps receiving the contractual cash flow; only the source changes.

The cost of defeasance is the cost of the security portfolio minus the loan balance plus the operational fees. The portfolio cost equals the present value of the loan's remaining cash flows, discounted at the yields available on the matching Treasury/agency securities at execution. When Treasury yields are below the loan coupon, the portfolio costs more than par balance — the borrower writes a check for the difference. When Treasury yields are above the loan coupon, the portfolio costs less than par — the borrower receives a net cash refund. This is the "negative defeasance" condition the cluster's CMBS article covers in depth.

Operationally, defeasance is the heaviest regime. The borrower engages a defeasance consultant (Chatham Financial, Commercial Defeasance LLC, AST Defeasance, Waterstone), the master servicer of the CMBS trust, a securities broker, counsel, and the trustee. Execution runs 30–45 days from engagement to closing. Aggregate professional fees on a $50M defeasance typically run $40–75K — separate from the headline penalty quoted by the consultant's free calculator.

Worked example for the same $50M reference: $50M CMBS conduit loan, Year 5 of a 10-year term, 5.5% coupon, 30-year amortization. Remaining principal at Year 5: roughly $47.0M. The matching Treasury portfolio replicating 60 monthly P&I payments plus the Year-10 balloon, assembled at the current curve (5y UST at 4.25%), costs roughly $50.4M. Defeasance penalty = $50.4M portfolio cost − $47.0M par balance = $3.40M, plus $50K of professional fees. All-in cost: about $3.45M, or 7.3% of balance.

The sibling CMBS article walks the full portfolio-construction mechanics — how the consultant selects individual Treasury maturities to match monthly cash flows, the role of "successor borrower" entities, and the 2014–2016 vintage loans currently producing net cash receipts. The institutional borrower pricing prepayment across debt types only needs the punchline: defeasance costs the present value of the portfolio minus par, plus $40–75K of fees, and moves with the Treasury curve in the same direction as YM.

Step-Down: The Math

Step-down is the simplest regime mathematically. The borrower pays a percentage of the principal balance equal to whatever the schedule prescribes in the current year of the loan's life. The schedule is fixed at origination, doesn't depend on the rate environment, and is quotable in a sentence.

The canonical agency multifamily step-down on a 10-year DUS or Optigo loan is 5-4-3-2-1: a 5% premium in Year 1, declining 1% per year to 1% in Year 5, with the loan often becoming open thereafter (or transitioning to a 1% prepayment premium through Year 9 with the last 3–6 months open). HUD 223(f) on a 35–40-year fully-amortizing structure uses a longer declining schedule (5-4-3-2-1-1-1-1-1-1 across the first 10 years, then varies). SBA 504 uses a 10-year 5-4-3-2-1-0.5-0.5-0.5-0.5-0.5.

Worked example for the same $50M reference: $50M agency multifamily loan, Year 5 of a 10-year term, 5-4-3-2-1 step-down schedule. Remaining principal at Year 5: roughly $47.0M. The Year-5 step-down premium is 1% (the last year of the declining schedule on the canonical 5-4-3-2-1). Step-down penalty = 1% × $47.0M = $470K. If the schedule were 5-4-3-2-1 with prepayment occurring at the start of Year 5 (paying the Year-5 rate of 1%) versus the start of Year 4 (paying the Year-4 rate of 2%), the difference is $470K vs $940K. The hero figure assumes a 3% Year-5 rate to illustrate a stiffer step-down typical of some HUD and life-co step-down variants — the canonical agency 5-4-3-2-1 produces lower numbers.

The institutional advantage of step-down is predictability. The borrower knows on Day 1 of origination exactly what prepayment will cost in any month. YM and defeasance produce wildly different numbers depending on the Treasury curve at exit; step-down is fixed. For sponsors with high refinance optionality — particularly multifamily operators with frequent recapitalizations — that predictability is valuable even when the headline percentage looks higher than YM in a flat-rate environment. The Adventures in CRE glossary covers the comparison from the practitioner angle; the institutional read is that step-down trades higher expected penalty for protection against the rate-collapse scenario that makes YM expensive.

Open Prepayment: When You Get It

Open prepayment — pay off at par, no penalty — appears in three institutional contexts. (1) The final-months open window embedded in nearly every institutional loan: 3 months on CMBS conduit, 3–6 months on agency multifamily and life co, sometimes 6+ months on bank. It exists to let the borrower refinance into a new loan that may close before the existing loan's maturity date. (2) Bridge loans after the minimum interest period (typically 3–6 months), with a 50–100 bps exit fee layered on — see Bridge Loans: Floating-Rate Risk and Exit Assumptions for the broader bridge economics. (3) Bank balance-sheet relationship loans, where the bank trades prepayment protection for relationship value and prices the flexibility into a slightly higher upfront coupon.

The institutional point: open prepayment is rarely "free" — it's typically priced into the upfront coupon. A 25 bps premium for open prepayment on a $50M loan costs roughly $125K per year of carry, comparable to a moderate step-down penalty. The comparison is on net cost across the expected hold, not on the headline penalty.

Prepayment Lockout: The Constraint

Lockout is the strictest regime: prepayment is prohibited for a defined window. The only options during lockout are to hold, to sell the property with loan assumption (if assumable), or to negotiate a workout/discounted payoff (a default-track process, not a market-rate prepayment).

Lockout windows by lender type:

• CMBS conduit: typically 24 months. Required by the trust structure to support predictable bond cash flow during the early years of the securitization.
• CMBS SASB: negotiable, typically 12–24 months. Some SASB structures eliminate lockout in favor of YM throughout.
• Life insurance company: portfolio-matched loans sometimes carry 36–60 month lockouts on top of YM. Most life co loans don't have lockout — YM serves the protection function.
• Bank and HUD construction: the construction phase functionally locks out prepayment until conversion or completion. HUD 221(d)(4) then follows the standard declining step-down on the permanent phase.

The implication: during the lockout window, the loan has no exit option at any price. Sponsors with high refinance optionality and short expected holds should avoid long-lockout structures even when the headline rate is favorable. No rate quote can re-price an option that doesn't exist.

The Borrower Decision Tree

The institutional question for a borrower with a maturing or potentially-prepayable loan: what's the cost of prepaying today versus holding? Four steps:

• 1. Identify the current phase. Pull the loan document and locate the current month relative to origination. Is the loan in lockout, the penalty window (defeasance / YM / step-down), or the open period?
• 2. Compute the penalty in the current phase. Step-down: current year's percentage × remaining principal. YM: closed-form formula at today's H.15 Treasury curve plus the loan-document make-whole spread. Defeasance: consultant's calculator plus $40–75K of fees. Lockout: not permitted — only sale-with-assumption or workout.
• 3. Compare to the cost of holding. Compute the NPV of the coupon spread between the existing loan and a refinance loan across the remaining term. If the existing coupon is well above market (the typical 2026 situation for 2023–2024 vintage paper), prepay-and-refinance may save more than the penalty. If below market (2020–2021 vintage at 3.5–4.0%), hold — the penalty is rarely worth the higher refinance rate.
• 4. Time the open period. The last 3–6 months are usually free. Borrowers who don't model the open window structurally overstate penalty cost on near-maturity loans.

2026 Rate Environment

The 2026 Treasury curve makes YM and defeasance costs moderate on most institutional loans — not because the regimes have changed, but because the rate environment finally caught up with the 2019–2022 vintage coupons. Current curve (mid-2026 snapshot per the Fed H.15 daily publication):

• 2-year Treasury: roughly 4.10%
• 3-year Treasury: roughly 4.15%
• 5-year Treasury: roughly 4.25%
• 10-year Treasury: roughly 4.40%

Against typical 2019–2022 vintage CRE loan coupons of 3.5–5.0%, today's curve sits at or modestly above the loan coupon. YM and defeasance economics on this vintage paper are correspondingly moderate. A 4.5% coupon life co loan with the 5-year UST at 4.25% pays low single-digit YM; a 3.75% coupon 2015-vintage CMBS conduit loan defeased at today's curve enters the "negative defeasance" zone where the borrower receives a net cash refund. The cluster's CMBS-specific article walks the negative-defeasance phenomenon and the institutional bid-ask between consultants and master servicers in depth.

For 2023–2024 vintage loans at 6.5–7.5% coupons, the math reverses: these loans have elevated YM and defeasance costs because the loan coupon sits well above today's Treasury yield. A 7.0% coupon 2023-vintage life co loan exiting in Year 3 with the 7-year UST at 4.35% pays roughly 11–14% of balance. The borrower who locked in 2023-vintage fixed-rate debt and now wants to refinance into 2026 rates pays the rate-cycle penalty in full.

The macroeconomic context is the 2026 maturity wave: roughly $1.5T of CRE debt maturing 2025–2027 per MBA's Commercial Real Estate Debt Outstanding publication, with over $100B of CMBS specifically maturing in 2026 per Morningstar's CMBS surveillance. Every refinance decision in this wave involves pricing the prepayment cost against the coupon-improvement opportunity at the current Treasury curve. See Refinancing Risk: Maturity Wave and Default Rate Sensitivity for the broader context.

How to Model It

The institutional prepayment model is a five-column comparison on each term sheet the sponsor is evaluating: open prepayment, step-down, yield maintenance at today's curve, defeasance at today's curve, and the lockout constraint. Each column produces a single number — the all-in prepayment cost at the assumed exit year — and the lender-by-lender comparison is the basis for selecting the loan whose total economics work against the sponsor's expected hold.

The workflow:

• 1. Specify the exit year. Most institutional sponsors model a base case (typical hold — 5 years for value-add multifamily, 7–10 for core-plus, 3 for opportunistic bridge) and a stress case (extended hold, often 2–3 years longer). The prepayment cost is meaningfully different in each.
• 2. Pull the loan-document prepayment provision for each term sheet. The provision specifies the regime, the lockout (if any), the step-down schedule (if any), the YM make-whole spread (if YM), and the open-period start date. These are loan-document items, not market conventions.
• 3. Compute the prepayment cost at the exit year. For step-down, apply the year's percentage to the projected remaining balance. For YM, build the closed-form formula with today's curve plugged in. For defeasance, use the consultant's calculator or the same closed-form approximation (defeasance and YM produce similar numbers in normal-curve environments). For lockout, flag the constraint — the loan can't be exited in that year.
• 4. Add operational fees. Defeasance: $40–75K of professional fees. YM: typically $10–25K of legal review and master-servicer fees. Step-down and open: minimal beyond the standard defeasance/prepayment-administration fee in the loan document. The headline penalty isn't the full cost.
• 5. Compare the all-in number against the coupon savings. The prepayment cost is one side of the ledger; the coupon improvement from refinancing into the new loan is the other. The NPV of the spread across the remaining term determines whether prepayment is economic.

Apers Marketplace pocket models run this comparison as a built-in module. AQ-110 (multifamily) handles agency step-down and life co YM scenarios for refinance decisions during the hold; AQ-141 (opportunistic with bridge) models bridge exit fees and minimum interest periods; AQ-301 (anchored retail) handles CMBS defeasance and YM for long-hold institutional retail.

Common Mistakes

Seven errors we see repeatedly in institutional prepayment analysis — each one produces a misquoted prepayment cost on a term-sheet comparison or a missed refinance window at maturity:

• Confusing yield maintenance and defeasance. The two regimes produce similar-magnitude numbers in flat-curve environments but operate completely differently. YM is a cash payment to the lender; defeasance is a securities-portfolio substitution. The operational lift is wildly different (YM closes in days; defeasance requires 30–45 days and multiple counterparties). Borrowers who quote "YM or defeasance" interchangeably miss the timing and the cash-flow differences.

• Treating the headline penalty as the only prepayment cost. Defeasance has $40–75K of professional fees; YM has $10–25K of legal review and master-servicer fees; bridge loans have exit fees of 50–100 bps on top of the minimum interest period. The free calculators on consultant websites produce the headline number; the total cost is materially higher.

• Missing the lockout window. On CMBS conduit and some life co loans, the loan can't be prepaid at all in the first 24–36 months. Borrowers who quote a Year-2 prepayment penalty for a CMBS conduit loan have ignored the lockout — the loan can't be exited that year at any cost. The right answer is "not permitted; hold or sale-with-assumption."

• Not modeling the open-period flexibility. The last 3–6 months of most institutional loans are open. Borrowers planning a refinance for a loan with 6 months remaining who quote full YM or defeasance are missing the free-prepayment window. Time the refinance closing into the open period and the penalty drops to zero.

• Pricing YM at the wrong Treasury rate. The Treasury yield used in YM is interpolated to the remaining loan tenor on the prepayment notice date — not the original loan tenor, not the average rate across the loan's life, not any forecast. Practitioners who use a 10-year Treasury for a YM calculation on a loan with 3 years remaining structurally misquote the penalty.

• Ignoring swap breakage on bank-swapped loans. Bank floating-rate term loans swapped to fixed have two prepayment components: the loan's own prepayment regime (typically step-down or open), and the swap's mark-to-market unwind cost. The swap breakage is a separate calculation, often in the same direction as YM (lender's lost coupon) but mechanically different. See Interest Rate Risk: Caps, Swaps, and Hedging for the swap-mechanics depth.

• Comparing prepayment cost without comparing coupon. CMBS has lower coupons and harder prepayment; bank has higher coupons and easier prepayment; life co sits in the middle. Comparing the defeasance cost on a CMBS loan against the open prepayment of a bank loan without normalizing for the coupon spread misses the structural trade-off. The right comparison is the NPV of total interest expense plus prepayment cost across the expected hold — not the prepayment cost in isolation.

Related Articles

Prepayment analysis is one of five disciplines in the institutional debt-analysis cluster. Sibling deep-dives and the CMBS-specific reference:

• DSCR: Sizing Constraints, Amortizing vs IO — the cluster anchor. The four-constraint sizing stack and the IO-vs-amortizing proceeds delta. Prepayment economics interact with IO structures because the open-period balloon dominates IO loan economics.
• Debt Yield: Why Institutional Lenders Prefer It — the institutional sizing comparator. CMBS conduit (defeasance) is sized to debt yield; understanding why CMBS sizes to debt yield explains why CMBS uses defeasance.
• LTV vs LTC: When Each Governs — the collateral and cost-basis constraints. Bridge debt (open prepayment, exit fee) is typically LTC-governed; understanding LTC sizing connects to bridge exit economics.
• Interest Rate Risk: Caps, Swaps, and Hedging — the hedging counterpart. Bank floating-rate loans swapped to fixed have swap-breakage costs on prepayment that mirror YM but operate through the swap MTM.
• Refinancing Risk: Maturity Wave and Default Rate Sensitivity — the 2026 maturity-wave context. Prepayment cost is one input to the refinance-decision math; the broader article covers the wave's full economics.
• CMBS Prepayment: Conduit vs SASB, Yield Maintenance, and Defeasance — the CMBS-specific deep dive. The YM formula derivation, the defeasance portfolio construction, and the 2026 negative-defeasance phenomenon. The complementary reference for CMBS-specific depth.

FAQ

Sources

Reference materials and authority sources behind this article (cited by name where direct URLs are bot-blocked or paywalled; specific document paths verified or referenced by name only):

• Mortgage Bankers Association — Commercial Real Estate Debt Outstanding quarterly publication; Commercial/Multifamily Quarterly DataBook. The institutional anchor for the 2026 maturity-wave context.
• Trepp — CMBS surveillance data and quarterly market commentary on the CRE debt cycle, including the 2026 maturity wave and the negative-defeasance window.
• Chatham Financial — defeasance and yield-maintenance market commentary; the dominant defeasance consultancy. cf.com/insights.
• Commercial Defeasance LLC ("Defease With Ease"), AST Defeasance, Waterstone Defeasance — institutional defeasance consultants; cited by name as the operational counterparts to Chatham.
• Fannie Mae Multifamily — DUS Selling and Servicing Guide; prepayment-premium options. mfguide.fanniemae.com.
• Freddie Mac Optigo — Multifamily Seller/Servicer Guide; prepayment-premium options.
• U.S. Department of Housing and Urban Development (HUD) — 223(f) and 221(d)(4) handbooks; declining step-down prepayment schedules. Cited by name.
• Structured Finance Association — SASB issuance research; conduit vs SASB structural distinctions. structuredfinance.org.
• Federal Reserve — H.15 daily Treasury yield curve, the reference rate used in yield-maintenance and defeasance calculations. federalreserve.gov/releases/h15.
• Adventures in CRE — practitioner glossary entries on yield maintenance and defeasance. adventuresincre.com.
• Boulder Group — quarterly net lease and CRE financing market reports.
• Investopedia — reference definitions of yield maintenance and defeasance.
• Morningstar DBRS — CMBS surveillance; 2026 maturity profile and prepayment-window expiration tracking.