A $5 million mortgage can need $5.46 million of replacement collateral

A property sale model that deducts only the mortgage balance can overstate the seller's proceeds. When the loan requires defeasance to release the building, falling bond yields can make that exit more expensive—even while cheaper financing makes a sale or refinancing more attractive.[1]

The missing price is the cost of buying the loan's remaining payments. The following scenarios use invented figures to isolate that mechanism; they are not current market quotes.

A tree shades the entrance canopy and pale stone facade of Parker House apartments on Connecticut Avenue in Washington, D.C. — Parker House apartments in Washington, D.C., photographed by Carol M. Highsmith in 2010. The building illustrates the physical asset behind multifamily lending; the hypothetical loan below is unrelated to this property's financing. The George F. Landegger Collection of District of Columbia Photographs in Carol M. Highsmith's America, Library of Congress, Prints and Photographs Division.[6]

The building leaves; the payment schedule stays

Defeasance replaces the real estate securing a loan with an acceptable portfolio of securities. A successor borrower takes over the debt and the substitute collateral, allowing the original property to be released. The loan continues to exist.[1]

That distinction matters to the investor receiving its payments. Fannie Mae's fixed-rate defeasance prospectus explains that a defeased mortgage remains in its securities pool, with replacement collateral funding the scheduled principal and interest. A building can change hands without forcing the investor to receive principal early and reinvest it.[4]

The borrower therefore needs more than bonds with the same face value as the mortgage. The replacement assets must support the required payments at the required times. Treasury STRIPS make the idea easy to visualize: each separated interest or principal payment becomes a security with a single payment at maturity. A series of such dated receipts illustrates cash-flow matching, although the loan documents determine which securities and arrangements are actually acceptable.[3]

This option is contractual. Fannie Mae's servicing guide permits defeasance only where the loan documents allow it. Its process includes checking eligibility, arranging substitute collateral, assigning the debt and releasing the property.[2]

Scenario: yields fall and the exit bill grows

Assume an interest-only loan with $5 million outstanding, a 5% coupon and five years remaining. For clarity, interest is paid annually and all principal comes due with the final payment. Assume the documents permit defeasance now.

Next assume every matching payment can be purchased at a flat 3% annual yield. Discount each annual interest payment and the final principal payment at that rate, then add their present values. The replacement portfolio costs approximately $5.458 million, or $458,000 above the outstanding balance, before expenses.

This is the author's calculation. It deliberately excludes accrued interest, transaction costs, taxes, amortization and differences between yields at different maturities. Real mortgages commonly have monthly payments, and an executable securities portfolio must match the actual schedule rather than this simplified one.

The economic reason is straightforward. The existing loan promises interest above the assumed market yield. Recreating those promises with lower-yielding securities requires more capital today. Nothing has happened to the building's rent roll, and the original mortgage rate has not changed. Nevertheless, the price of releasing the collateral has risen.

For the seller, the portfolio purchase replaces the principal-only deduction in the sale model. Do not subtract both the full portfolio cost and the mortgage balance: that would count the principal funding twice. The extra burden in this example is the amount above the balance, plus applicable expenses and other closing amounts.

Scenario: yields rise and the advantage moves elsewhere

Reverse the rate move while holding the promised payments fixed. Higher yields reduce their present value, so the same future cash flows cost less to buy. If the matching yields rise sufficiently, the securities can cost less than the outstanding principal. JPMorgan describes this direction of sensitivity, while also noting the counterweight: a borrower seeking replacement financing then faces higher rates.[1]

This is why a cheaper defeasance quote cannot establish that a refinancing is attractive. The old loan's exit cost and the new loan's cost move through different parts of the transaction. A saving on the first can be outweighed by more expensive debt service on the second.

The reverse is also true. Falling rates may improve the buyer's financing or support a higher sale price enough to absorb a larger defeasance bill. The defensible thesis is that principal alone understates the exit requirement in the lower-yield scenario. It is not a prediction that lower rates make the entire property transaction worse.

Scenario: the contract changes the route

Time can change the available choices. The Fannie Mae prospectus describes both a defeasance lockout and a later period when voluntary prepayment becomes available. Those boundaries belong to the particular loan's terms; they are not dates a seller can infer from a generic calculator.[4]

Yield maintenance is another structure. It generally involves repaying principal and paying a contractual premium, whereas defeasance funds continuing payments through substitute collateral. Similar economic purposes do not make the closing procedures interchangeable.[1]

Nor is the securities quote the whole cash requirement. Fannie Mae's guide separately identifies the next scheduled payment, other sums due and expenses associated with the transaction, including legal costs. It also provides for third-party expense reimbursement if the planned defeasance does not close. These are requirements of that program, rather than a universal fee schedule.[2]

The practical falsifier for the exit-premium thesis on a particular deal is an executable, complete release quote at or below the outstanding principal. That would show the modeled premium does not apply to that transaction. A lower indicative estimate alone is insufficient: Fannie Mae explicitly describes its calculator output as indicative.[5]

Three closing events to watch

Before signing the sale or refinancing agreement: confirm the loan's eligibility dates and permitted release route. The expected closing date must fit the contractual window.[2][4]
When the replacement securities price is fixed: reconcile the exact debt-service schedule with the collateral cost, then replace the principal-only assumption in the proceeds model. Refresh any earlier indicative estimate.[3][5]
At final closing-statement approval: reconcile the portfolio purchase, payments due and transaction expenses with the cash available. That is where the seller learns what the sale actually returns.[2]

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