CMBS vs portfolio loans: the five structural differences that matter more than the rate on the term sheet.
Most sponsors choose between a CMBS loan and a portfolio loan by comparing the interest rate on the term sheet. That is the least important comparison you will make.
The rate difference between a CMBS loan and a comparable portfolio loan is often narrow. The structural differences are not. They affect your flexibility to sell, your options if the business plan changes, your experience if something goes wrong, and your total cost of capital over the entire hold period.
Here are the five things to compare before you commit to either structure.
A CMBS loan (Commercial Mortgage-Backed Securities loan) is originated by a conduit lender and then pooled with other commercial mortgages and sold to investors as rated bonds. Once sold, your loan is no longer held by the institution that made it. It is owned by a pool of investors and managed by a third-party servicer.
A portfolio loan is originated and held by the lender on its own balance sheet. Banks, life insurance companies, credit unions, and some debt funds are the primary portfolio lenders. Because they keep the loan, they retain decision-making authority over modifications, extensions, and workouts for the life of the loan.
This is the most commonly misunderstood difference and the most costly to get wrong.
CMBS loans are structured for investors who purchased bonds expecting a specific stream of interest payments. If you pay off the loan early, those investors lose yield they were counting on. To compensate them, CMBS loans include prepayment protections that can be expensive to exit.
The two most common forms:
Defeasance: You purchase a portfolio of US Treasury securities that generates cash flows matching your remaining loan payments. Those securities are substituted for your property as collateral. The cost depends on the difference between your note rate and current Treasury yields. In a rising rate environment defeasance is relatively inexpensive. In a falling rate environment it can cost a significant amount relative to your loan balance.
Yield maintenance: You pay the present value of the difference between your note rate and the current Treasury rate for all remaining payments. The calculation is similar to defeasance in effect.
Both forms of prepayment protection can create meaningful costs that must be modelled into your total hold period economics before you sign.
Portfolio lenders typically use step-down prepayment penalties (for example, a percentage of the outstanding balance that declines over time) or a lockout period followed by open prepayment. These are generally more predictable and less expensive than CMBS prepayment protections, particularly in volatile rate environments.
When this matters: If there is any possibility you will sell or refinance before the loan matures, model the cost of prepayment under both structures across a range of rate scenarios before choosing.
Once your CMBS loan is sold into a securitisation, your relationship is with a master servicer and, if the loan ever experiences stress, a special servicer. These entities follow strict servicing standards defined in the pooling and servicing agreement. Their flexibility to accommodate requests outside standard parameters is limited by their fiduciary obligation to the bondholders.
For a performing loan with no issues, this typically does not matter. For a loan that requires any kind of accommodation, it matters considerably.
Your relationship is with the institution that made the loan. If your property performs as expected, the experience is similar to CMBS. If you need a lease approval, a budget amendment, an extension of a reserve release, or any conversation about the loan, you are talking to a decision-maker who has the authority to respond.
When this matters: Value-add and transitional transactions, deals in active lease-up, and any transaction where the business plan involves material changes during the loan term are better suited to portfolio lenders. The ability to have a substantive conversation with your lender is not a luxury in those situations.
Modifying a CMBS loan requires approval from the servicer and, in many cases, the special servicer and a controlling class representative. Because the loan has been sold to multiple investors, there is no single decision-maker. Modifications that would be routine with a portfolio lender can be slow, expensive, or unavailable.
This is not a hypothetical concern. Lease extensions, partial releases, collateral substitutions, and loan assumption approvals all require servicer consent. The process is more rigid than most sponsors expect when they first originate a CMBS loan.
Portfolio lenders can modify loan terms when circumstances warrant. Extensions, covenant waivers, reserve restructuring, and partial releases are negotiated directly with the lender. The outcome is not guaranteed, but the process is a conversation rather than a servicing protocol.
When this matters: The longer the hold period and the more active the business plan, the more likely you are to need some form of modification. Sponsors who have gone through a market disruption with both CMBS and portfolio loans consistently report that the portfolio loan relationship provides meaningfully more flexibility.
CMBS loans are assumable, subject to servicer approval and an assumption fee (typically around one percent of the outstanding loan balance, though this varies). Assumability allows a buyer of your property to take over your existing financing rather than originating a new loan.
This is a genuine advantage in a rising rate environment. If your loan was originated when rates were lower, a buyer who can assume your financing instead of taking out a new loan at current market rates may be willing to pay more for the property. Assumability can be a meaningful component of exit value in the right rate environment.
Portfolio loans are typically not assumable. A sale of the property triggers a payoff of the existing loan and the buyer arranges their own financing. In a rising rate environment this means your buyer pays current market rates rather than your below-market loan rate, which can affect pricing and marketing of the property at disposition.
When this matters: Assumability is most valuable when you originate in a relatively low rate environment and expect to sell in a higher rate environment. If you are originating in a high rate environment, or if rates decline during your hold period, assumability is less of a differentiator.
The rate on the term sheet is one input into your total cost of capital. The full calculation includes:
Origination fees and closing costs: Both structures have these. CMBS typically involves additional costs associated with securitisation.
Third-party report requirements: CMBS loans require appraisals, environmental reports, and property condition assessments that meet securitisation standards. These are standard for portfolio loans as well but the specifications differ.
Prepayment cost: As described above, CMBS prepayment protections can be significant. Model this across your expected hold period and a range of exit timing scenarios.
Servicer fees and reserves: CMBS loans often require more extensive reserve structures than portfolio loans. Tax and insurance escrows, replacement reserves, and sometimes lease-up reserves are held by the servicer and released on a schedule. The timing and conditions of reserve releases are governed by the servicing agreement.
Cost of any modifications needed: If your business plan requires modifications during the loan term, the administrative and legal cost of obtaining servicer approval on a CMBS loan can be meaningfully higher than negotiating directly with a portfolio lender.
The right comparison is total cost of capital over the full hold period, not the interest rate on day one.
Neither structure is universally superior. The right choice depends on your specific transaction.
CMBS may be the better fit when:
A portfolio loan may be the better fit when:
Yes, but it requires paying the prepayment protection, either through defeasance or yield maintenance. The cost depends on your note rate relative to current Treasury rates and the remaining term. Before originating a CMBS loan, model the prepayment cost across a range of exit timing scenarios to ensure the economics work under each.
The master servicer can change through acquisition or industry consolidation. Your loan terms do not change, but your point of contact and the servicer's internal processes may. The loan documents and pooling and servicing agreement govern the relationship regardless of which entity is acting as servicer.
Generally yes, but not unconditionally. Portfolio lenders have their own credit policies, approval processes, and risk management requirements. A portfolio lender may decline a modification request if it conflicts with their credit standards or regulatory requirements. The key difference is that you are negotiating with a decision-maker who has the authority to say yes, rather than a servicer operating within a defined protocol.
Standard conduit CMBS loans are designed for stabilised assets. Some CMBS lenders have bridge programs for transitional assets, but these are structured differently from standard conduit loans. Value-add and renovation transactions are typically better suited to bridge loans from banks or debt funds, with a CMBS or portfolio permanent loan as the takeout once the property stabilises.
The right lender depends on your property type, location, loan size, leverage requirement, and timeline. George Smith Partners maintains active relationships with conduit CMBS lenders, life insurance companies, banks, debt funds, and private lenders across all major markets. Our role is to identify which lenders are actively quoting your transaction type and to position your deal to achieve the best available terms within the right structure for your business plan.
Choosing the right loan structure is one of the first decisions we work through with every client. George Smith Partners has arranged both CMBS and portfolio loans across all major property types and markets. Our team can help you model the full hold period economics of each structure before you commit.
Talk to Our TeamThe financing structures and general terms described in this article reflect typical market conditions and are intended for educational purposes only. Actual loan terms vary by transaction, lender, market conditions, property type, and sponsor profile. Nothing in this article constitutes a commitment to lend or a guarantee of specific financing terms. George Smith Partners recommends a direct consultation with our team to evaluate which loan structure is appropriate for your specific transaction and business plan.