C-PACE Alignment for Mortgage Lenders
An educational overview of how C-PACE fits into today’s capital stack
The C-PACE market has surpassed $10 billion in lifetime volume. That milestone signals a shift from niche financing to institutional capital.
Borrowers are asking about C-PACE earlier in the process—and mortgage lenders are increasingly being asked to evaluate how it fits alongside senior debt.
At CastleGreen, we support mortgage lenders as C-PACE becomes a more common and meaningful component of commercial real estate financing.
C-PACE
What Is C-PACE?
C-PACE (Commercial Property Assessed Clean Energy) is an assessment-based financing structure used to fund qualified improvements to commercial properties.
Rather than operating as a traditional loan, C-PACE is repaid through a voluntary special assessment that appears as a line item within the property tax payment framework and is recorded in land records. The obligation is tied to the property rather than borrower credit.
Key structural characteristics include:
- Long-term, fully amortizing financing (typically 10–30 years)
- Fixed interest rates
- Repayment aligned with the useful life of the improvements
- A property-level obligation that transfers with ownership
How Is C-PACE Used?
C-PACE is commonly used to finance improvements that support long-term asset performance and operational efficiency, including:
- Energy efficiency upgrades (HVAC, lighting, controls, building envelope)
- Water conservation measures
- Certain renewable energy systems (where approved)
- Resiliency improvements (where approved)
For borrowers, C-PACE can be a way to execute necessary capital improvements without over-constraining mortgage loan proceeds.
How Does C-PACE Fit Into A Capital Stack?
C-PACE has evolved from an add-on to a core capital stack component. As the market has matured, C-PACE is now frequently introduced earlier in transactions and at larger sizes.
This evolution has increased engagement from mortgage lenders—particularly around consent, lien structure, underwriting treatment, and servicing considerations.
C-PACE is increasingly viewed as credit-positive, mortgage-debt-compatible capital that can complement traditional financing when structured and understood properly.
C-PACE Financing, Integrated with Mortgage Debt
How C-PACE Works Alongside Traditional Mortgage Debt
C-PACE programs and transactions are structured to directly address mortgage lender considerations:
- Repayment through property tax bills as a dedicated assessment
- Non-acceleration: If a borrower becomes delinquent, only the delinquent installment is subject to collection—not the full remaining assessment
- Notice and cure rights: State statutes typically extend these rights to mortgage holders
- Preservation of mortgage loan priority: The lender maintains a senior fee mortgage while the C-PACE assessment remains current
- Escrow options: Many mortgage lenders choose to escrow C-PACE payments similarly to real estate taxes
Most programs require mortgage lender consent prior to closing, however CastleGreen always requires mortgage lender consent placing emphasis on early alignment and transparency.
Why This Matters Now
Several factors are driving increased mortgage lender engagement:
- Borrowers are proactively seeking C-PACE to fund efficiency, resilience, and deferred maintenance
- C-PACE is being introduced earlier in the financing process
- Prominent mortgage brokerage firms have become educated on the value of C-PACE Financing for their clients
- Underwriting teams are incorporating C-PACE assessments into cash flow and risk analysis
- Deal sizes have increased, making structure and clarity more important
As C-PACE becomes more integrated into transactions, early understanding reduces friction and improves execution.
What Early Alignment Unlocks
When mortgage lenders and C-PACE providers engage early, it can unlock:
- Clearer alignment around long-term asset value
- More competitive and flexible overall financing structures
- Coordination on process during respective underwriting as well as the construction monitoring and draw process during construction
- Additional capacity to close transactions where mortgage loan proceeds are capped
- Reduced late-stage execution risk
For many lenders, C-PACE has become a tool to support borrower objectives without increasing loan exposure.
Why Mortgage Lenders Are Engaging
Mortgage lenders working through C-PACE alignment often cite:
- Improved asset performance and durability
- Increased marketability of the asset to tenants and property managers
- Reduced operating costs that can support stronger NOI
- Lower reliance on higher-cost capital sources
- Preservation of traditional lender rights and remedies
- Stronger borrower relationships through collaborative structuring
C-PACE is no longer a footnote—it is a tool borrowers are actively leveraging at scale.
How CastleGreen Supports Lender Alignment
At CastleGreen, we support the continued evolution of how C-PACE is integrated into the capital stack—and the growing role mortgage lenders play in that process.
Our role is educational and facilitative, helping lenders navigate:
- Consent and approval workflows
- Lien structure and documentation expectations
- Borrower obligations and underwriting inputs
- Practical servicing considerations, including escrow options
Mortgage Lenders FAQs
Does C-PACE change the priority of an existing mortgage?
No. C-PACE does not subordinate or impair the priority of an existing senior mortgage as long as the assessment remains current. The senior lender continues to hold a senior fee mortgage with full rights and remedies.
What happens if a borrower becomes delinquent on C-PACE payments?
C-PACE assessments are non-accelerating. Only the delinquent installment amount is subject to collection, not the full remaining balance. Future payments remain scheduled as originally structured. In delinquency scenario the unpaid assessment installments are given the same lien priority as other municipal special assessments and property taxes.
Do senior lenders receive notice and cure rights?
Yes. State statutes commonly extend notice and cure rights to mortgage holders, allowing lenders to address issues proactively and preserve control.
How large is C-PACE relative to property value?
C-PACE financing typically represents approximately 10% to 30% of a property’s value and is amortized over a long term. Even in a delinquency scenario, the unpaid portion is generally minimal relative to stabilized value.
Does C-PACE complicate refinancing?
In most cases, no. Because the assessment does not accelerate, and its payment schedule is fixed and consistent, refinancing is commonly achievable. Properties with C-PACE are often viewed favorably due to improved energy performance and lower operating costs.
Can C-PACE be paid off at refinance or sale?
Yes. C-PACE structures allow early prepayment at the discretion of the property owner. At the same time, C-PACE providers are prohibited from calling or accelerating the assessment.
How do C-PACE-funded improvements affect asset risk?
Energy-efficient improvements have been associated with lower operating costs, improved cash flow, and reduced default risk, which can support mortgage loan stability.
Is C-PACE supported by legislation?
Yes. C-PACE is enabled by legislation in 38 states and the District of Columbia, providing a consistent legal framework around assessments, lender consent, and borrower obligations.
Why are lenders engaging earlier in the process?
Earlier engagement allows lenders to evaluate structure, consent terms, and cash flow impacts upfront—reducing execution risk and late-stage friction.
Continue the Conversation
If you’re reviewing a transaction, evaluating consent language, or simply looking to better understand how C-PACE fits into today’s capital stack, CastleGreen is available as a resource.
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Sal Tarsia
MANAGING PARTNER
CASTLEGREEN FINANCE
Amanda Samai
MANAGING DIRECTOR,
CAPITAL MARKETS & PACE PROGRAMS
CAPITAL MARKETS & PACE PROGRAMS
CASTLEGREEN FINANCE