Adding debt behind a CMBS loan: mezzanine, second liens and preferred equity

Most CMBS loans do not allow a second mortgage, and supplemental financing usually means mezzanine debt or preferred equity at the ownership level, and only if the loan agreement permits it. Where it does, expect combined tests: The Spiral loan in BANK5 2025-5YR14 caps combined loan-to-value at 62.0% with a 1.35x combined DSCR and 8.1% combined debt yield (prospectus, p. 233).

Agency multifamily programs offer supplemental loans as a product. Conduit CMBS does not have an equivalent; the trust holds one first mortgage and the documents protect it. If more leverage is the goal, compare a cash-out refinance and the agency route on CMBS vs agency loans.

What the documents usually say

The BANK5 2025-5YR14 prospectus (pp. 232-233) describes the pool’s limits on more debt, which are typical of conduit loans:

• The loans generally prohibit additional debt secured by the property without the lender’s consent.
• Substantially all allow limited unsecured debt in the ordinary course of business (trade payables).
• Pledges of general partner and managing member interests are restricted by percentage or control limits, while pledges of limited partner, non-managing member or non-controlling interests are generally permitted within limits.
• Some loans permit future mezzanine debt if combined loan-to-value, DSCR and debt yield tests are met and an intercreditor agreement is signed.
• A borrower not required to be a single-purpose entity may not be restricted from unsecured or mezzanine debt at all.

The October 2025 1010 Pacific Street loan agreement shows the other direction: its Section 11.6 lets the lender split the loan into a mortgage loan and a mezzanine loan at any time, at the same total amount and blended rate, and requires the borrower to cooperate. That is a lender’s tool for selling the loan, not a source of new money.

Who approves new debt

Under the BANK5 2025-5YR14 PSA:

Step	Rule
Is it a Major Decision?	Yes: “any consent to incurrence of additional debt by the Mortgagor or mezzanine debt by a direct or indirect parent of a Mortgagor, to the extent the lender’s approval is required” (6.08(a)(xii)); waiving a due-on-encumbrance clause is too (6.08(a)(v))
Who decides	Special servicer (3.08(b)), with Directing Certificateholder consent while no Control Termination Event exists, deemed given after 10 business days of silence on a complete package
No lender discretion	If the documents allow the debt on objective conditions, the servicer only checks that the conditions are met (3.08(b))
Rating agency confirmation	Required if the loan is 2% or more of the pool, has an LTV above 85% or DSCR below 1.20x including the proposed debt, is a top-ten loan, or is over $20 million; the first four apply only to loans of at least $10 million (3.08(b))
Cost of confirmation	Borrower’s expense to the extent the loan documents allow (3.08(b))

Discovered debt is a problem in its own right. The CREFC Portfolio Review Guidelines put a loan on the servicer watchlist as a credit item on a defaulted, matured or “previously undisclosed” subordinate lien, including mezzanine debt (code 1H, CREFC IRP v8.4, p. 66). See the CMBS watchlist.

The REMIC angle

Mezzanine debt sits above the borrower, so it does not change the mortgage loan itself. A modification of the mortgage to make room for it would be tested under the significant-modification rules (26 CFR 1.860G-2(b)); a waiver of a due-on-encumbrance clause is a listed exception (1.860G-2(b)(3)(iii)). That is why servicers can consent to permitted mezzanine without restructuring the senior loan.

Preferred equity

Preferred equity is money for an ownership stake with a priority return. Whether it needs consent turns on the loan’s transfer definitions: if the investor gains control rights, a management change or remedies to take over the managing member, the servicer will usually treat it like a transfer or a pledge. Keep control with the sponsor, or get consent first.

What to prepare if your loan allows mezzanine

• The loan agreement’s additional-debt section and the exact combined tests.
• Current trailing operating statements and rent roll, so the servicer can run combined DSCR and debt yield.
• A current appraisal, if combined loan-to-value is tested.
• The mezzanine term sheet and a draft intercreditor agreement on the form the documents require.
• Organizational chart showing what is being pledged.

If the documents do not allow it, the cleaner answer is often a refinance at or near the open period. Janover Capital LLC arranges CMBS and other financing, including recapitalizations; it is a commercial mortgage advisor, not a lender. Get a CMBS quote, or start with the CMBS refinance guide.

This page describes loan and servicing documents. It is not legal advice.

Sources: BANK5 2025-5YR14 prospectus, pp. 232-233; BANK5 2025-5YR14 PSA, 3.08(b), 6.08(a)(v), (xii); 1010 Pacific Street loan agreement, Section 11.6; CREFC IRP v8.4, Portfolio Review Guidelines; 26 CFR 1.860G-2(b).