The quick read: C-PACE, short for commercial property assessed clean energy, is financing for a building's qualifying energy, water and resilience improvements that the owner repays through a voluntary assessment on the property tax bill. It can fill part of a construction budget gap, but only for the qualifying scope, only where the state statute and a local program reach new construction, and only with the written consent of the mortgage lenders, because the assessment lien typically ranks ahead of their loans.
Treat C-PACE as a partial substitute for the junior layers of a development capital stack, mezzanine debt and preferred equity, not for the senior construction loan. Below: how the assessment works, where its lien ranks, why the lender must consent, how two state statutes treat new construction, and what a permanent lender requires at takeout. For the full development stack, see how new real estate development is financed.
How does C-PACE financing work?
C-PACE financing works by converting the cost of qualifying building improvements into a voluntary special assessment on the property, funded up front by a capital provider and repaid by the owner through the assessment over a long term. The U.S. Department of Energy notes it must be authorized by state legislation and then by local governments.
The Department of Energy's C-PACE fact sheet for state and local governments (October 2017) describes the core trade: "Unlike other project financing, the borrowed capital is repaid over time via a voluntary tax assessment," and because repayment is secured by that assessment and transfers to the next owner, terms "tend to be long (20-30 years)." Eligible improvements depend on the authorizing legislation and "may include energy efficiency, renewable energy, energy storage, and non-energy measures (e.g., storm and seismic hardening)." DOE's February 2022 toolkit overview calls C-PACE "a voluntary tool for financing energy efficiency, renewable energy, and resilience upgrades in commercial buildings" and lists energy-efficient new construction among its uses.
Several parties can be involved: the 2017 fact sheet lists property owners, capital providers, a program administrator, the mortgage holder, the contractor and a tax assessor. Because the obligation belongs to the property, Lawrence Berkeley National Laboratory's February 2018 report on C-PACE programs describes an assessment that "stays with the property" when ownership changes, "even in a foreclosure, unless the seller pays off the lien first."
Where does a C-PACE lien rank against the construction loan?
A C-PACE assessment lien typically ranks ahead of the construction loan, because as a special assessment it takes priority over other liens, including a first mortgage. Florida's commercial PACE statute calls it "a lien of equal dignity to county taxes and assessments," and Washington's makes it "a first and prior lien, second only to" tax liens.
The LBNL report states the general rule: "as a special assessment their liens typically take priority over other liens, even those assigned to first mortgage holders." Senior does not mean the whole balance comes due in a default, though. Florida's s. 163.082 bars enforcing the lien to accelerate "the remaining nondelinquent unpaid balance," Washington's C-PACER chapter says the not-yet-due portion "is not accelerated or eliminated by foreclosure," and a June 2019 brief from the Department of Energy and LBNL sums it up: "Only the delinquent payments are due; the balance of the lien owed passes on to the next property owner."
So in a foreclosure, the C-PACE claim with priority is the past-due installments, while future installments stay with the building. That is the trade a construction lender accepts when it consents.
Florida lien priority: equal dignity to county taxes and assessments, from the date of recordation (s. 163.082(6))
Washington lien priority: first and prior lien, second only to tax liens (RCW 36.165.060)
Acceleration: barred for the not-yet-due balance under both statutes
Sale of the building: remaining installments stay with the property unless paid off
Why does the senior construction lender have to consent?
The senior construction lender has to consent because the assessment will rank ahead of its mortgage, and most programs require or expect written consent before funding. Under Florida's statute, the program administrator "must receive the written consent of the current holders or loan servicers of any mortgage" first; Washington requires written consent from any lien or mortgage holder.
The Department of Energy's 2017 fact sheet calls mortgage holder consent "a best practice or requirement for most C-PACE programs." Two details matter on a construction deal. Florida's rule also reaches any mortgage "that will otherwise be secured by the property," so a construction loan closing alongside the C-PACE financing must sign, not only a lender already on title. And the reason is contractual: the LBNL report notes that "Debt arrangements typically contain covenants that require the building owner to obtain consent from the first mortgage holder in order to secure more debt through the property."
Consent is not automatic. The LBNL report describes a 2013 industry survey in which "a common reason for denial of consent was mortgage holders' lack of expertise in underwriting the cash flows from C-PACE projects," and notes that "An audit and third party review of the projected savings also tended to be part of successful requests." Bring the energy model, projected savings and that review to the construction lender at term-sheet stage, and ask: will you consent, on what conditions, and does your loan amount count the C-PACE dollars?
Can C-PACE pay for new construction?
C-PACE can pay for new construction only where the state statute and a local program extend to it, and statutes differ. Washington's defines a qualified project to include "new construction or the adaptive reuse of eligible property," while Florida's commercial PACE section contains no clause on new construction, so eligibility there must be confirmed with the program administrator.
Washington sets the bar for a new building: the applicant needs "certification by a licensed professional engineer stating that the proposed qualified improvements will enable the project to exceed" the energy, water, renewable or resilience requirements "of the current building code." Qualified improvements include "seismic retrofits, flood mitigation, stormwater management, wildfire and wind resistance, energy storage, and microgrids," and the financing may include "Capitalized interest" and "Interest reserves." A statute is not a program: counties may join a voluntary statewide program, if the state Department of Commerce establishes one, or run their own, so confirm your county has adopted one.
Florida's s. 163.08 defines commercial qualifying improvements "For installing or constructing improvements on commercial property," covering resiliency, energy efficiency, renewable energy, water conservation and waste system improvements, and counts multifamily property "composed of five or more dwelling units" as commercial. Under s. 163.082, a county or municipality must authorize the program administrator "by ordinance or resolution," and two rules bite on a job site: the administrator must find "no involuntary liens greater than $5,000, including, but not limited to, construction liens," and a change order raising the financed improvement's cost or scope "by 20 percent or more" needs a new disclosure and the owner's written approval.
Washington new construction: expressly eligible (RCW 36.165.010), with an engineer's certification that the project will exceed the current building code (RCW 36.165.030)
Florida new construction: no clause in s. 163.082; confirm eligibility with the program administrator in writing
Florida term cap: the weighted average useful life of the improvements, not to exceed 30 years (s. 163.082(4)(a)6)
When does the C-PACE money arrive during a build?
The C-PACE money arrives during construction or only after the work is complete, depending on the program's rules, and that timing decides whether C-PACE funds draws or merely repays other capital at the end. Lawrence Berkeley National Laboratory's 2018 report warns that some programs may require completed work before the assessment is recorded, funds are disbursed, or both.
The LBNL report is blunt about the consequence: "If C-PACE funds cannot be disbursed until work is completed, the contractor will need to front the money or the building owner will have to secure bridge funding," and commercial energy efficiency projects "could last three to six months or longer, especially in the case of new construction." The 2019 DOE and LBNL brief adds that project funds "may be disbursed as an upfront payment or in tranches as project milestones are completed (usually for larger projects)."
Ask the program three questions before you sign the senior term sheet: does it disburse up front, in milestone tranches or at completion; when is the assessment recorded relative to the construction mortgage; and what happens if completion slips? The answers show whether C-PACE reduces the gap capital needed during the build or only repays part of it at completion.
When does C-PACE replace mezzanine debt or preferred equity?
C-PACE replaces mezzanine debt or preferred equity only for the budget dollars that are qualifying improvements: when that scope is a real share of the gap, the program funds on a usable schedule, and both the construction and permanent lenders accept its lien, the assessment funds that scope and the junior tranche shrinks by the same amount.
The features that make an assessment attractive against those layers are documented. DOE's 2017 fact sheet says "Interest rates are competitive since the tax assessment mechanism is considered secure and low-risk," while noting that program and service fees are common. The LBNL report says C-PACE "does not require personal or parent company guarantees because it is property-based financing," does not accelerate, is non-recourse to the owner's other assets, and "can cover 100% of both hard and soft costs for a project," meaning the qualifying project, not the whole building.
It stops short when the gap exceeds the qualifying scope, when a program caps the assessment against property value (LBNL lists an "assessment to value ratio" among the financial limits programs may set), when a lender refuses consent, or when the program pays only at completion. Price it honestly: get each source's all-in cost on the same dollars, fees included, and compare the blended cost of the stack with and without the assessment.
Table: C-PACE versus other gap capital in a construction stack
| Source | Cost | Lien position | Consent needed | Best when |
|---|---|---|---|---|
| C-PACE assessment | Rate and fees set in the financing agreement; DOE's 2017 fact sheet calls rates competitive, with terms that tend to run 20-30 years | Tax-lien-level priority, ahead of the mortgage (Florida: equal dignity to county taxes; Washington: second only to tax liens) | Yes: written consent of mortgage holders under the Florida and Washington statutes | The budget carries qualifying energy, water or resilience scope and the local program covers new construction |
| Senior construction loan | Rate and fees set in the construction lender's term sheet | First mortgage, behind property taxes and any consented assessment | It is the lender asked to consent | Base layer of the stack; its size sets how large the gap is |
| Mezzanine debt | All-in cost per the mezzanine term sheet; compare it dollar for dollar with the C-PACE quote | Behind the senior loan; no tax-lien priority | Only if the senior loan documents permit it; ask the senior lender | The gap exceeds the qualifying scope, or a lender refuses to consent to an assessment |
| Preferred equity | A preferred return paid ahead of other equity; Freddie Mac's guide describes a return owed regardless of cash flow as "hard pay" | No lien; an ownership interest ranked ahead of common equity | Per the senior loan documents; Freddie Mac requires its prior approval of all preferred equity | The loan documents bar more debt but the sponsor still needs outside capital |
What will the permanent lender require if C-PACE stays on the property?
The permanent lender takes the property subject to the unpaid assessment, so plan for it to underwrite the C-PACE payments alongside its own loan. Freddie Mac's Multifamily Seller/Servicer Guide requires "The DCR and LTV of the combined debt of the loan and the C-PACE financing" to satisfy its then-current requirements before it will purchase or approve such a mortgage.
Chapter 24 of that guide reads like a takeout checklist: a savings-to-investment ratio "greater than one"; repayment "through property tax assessments on the Property, which payments will be escrowed," amortizing with no balloon and not secured by a mortgage; no right to accelerate; prompt default notice and "not less than a 30-day right to cure" for the mortgage lender; and the mortgage holder's consent before the borrower can obtain financing. Lenders are told to contact a Freddie Mac account manager "to determine Mortgage eligibility for C-PACE Consent."
The same logic covers the rest of the gap: chapter 9 of the guide says "All Preferred Equity is subject to Freddie Mac's prior approval." Before you close the construction loan, ask the lender type you expect to provide the permanent loan whether it will accept the assessment, and at what combined leverage.
How do you get lenders to price a construction loan with C-PACE in the stack?
You get lenders to price a construction loan with C-PACE in the stack by sending one complete file before term sheets: the budget with qualifying scope broken out, the energy model and savings forecast, the program's consent and disbursement rules, and your expected permanent loan, so each lender type answers the consent question up front.
YieldStack is a commercial mortgage brokerage, not a lender. Every credit decision is made by the lender; YieldStack arranges the introductions and negotiates on the borrower's side, and no loan, rate, or closing is guaranteed. The intake is a 5-minute submit, and one submission is matched against 20,000+ loan programs. It costs Zero upfront to submit a deal and review offers; YieldStack's broker fee is 0.50–1.00% of the loan amount and is paid only at closing. Start a guest submission for your construction loan.
The bottom line
C-PACE is financing for qualifying energy, water and resilience improvements, repaid through a voluntary property-tax assessment whose lien typically ranks ahead of the mortgage, does not accelerate and stays with the building. In a construction stack it can shrink the mezzanine or preferred equity tranche by the qualifying scope if four conditions hold: the statute and a local program reach new construction, the construction lender consents in writing, the program funds on a schedule the build can use, and the permanent lender accepts the combined debt.