Capital Stack: Understanding The Commercial Real Estate Capital Stack

Part of Are Fannie Mae Loans Non-Recourse for Multifamily?

Table of Contents

1. Real Estate Capital Stack
2. Capital stack diagram
3. Capital stack example
4. Frequently Asked Questions About The Commercial Real Estate Capital Stack
5. Capital Stack - Conclusion
6. Sources

The commercial real estate capital stack is the layered structure of every dollar financing an acquisition, organized from the lowest-risk position at the bottom (senior debt) to the highest-risk position at the top (common equity). The order matters because it dictates the cash-flow waterfall during the hold and the payout priority on a sale or refinance, which in turn determines both the rate of return each layer receives and the loss exposure each layer absorbs if the deal underperforms.

Most introductory writeups describe the capital stack as a four-layer construct (senior debt, mezzanine debt, preferred equity, common equity), which is the canonical academic version but rarely the actual structure of a stabilized multifamily syndication. In practice, the dominant institutional structure is a two-layer stack: roughly 70 to 75 percent agency senior debt against 25 to 30 percent LP common equity. The middle layers (mezzanine debt and preferred equity) appear when the deal's specific economics require them, which is the less common path. Knowing why the layers exist and which deals actually use them is what separates a literal reading of a capital-structure diagram from an operator-level read of what the structure says about the deal.

This guide walks through each layer's role, what risk and return profile each carries, when and why operators add middle layers to the stack, the structural anatomy of a typical multifamily syndication stack, and how to read the cap stack on a deal you're evaluating as an LP.

Real Estate Capital Stack

The commercial real estate capital stack is the working blueprint of how a deal gets financed, and it is the single document that tells a sophisticated LP the most about both the risk profile and the return mechanics of an opportunity. Every dollar contributed to the acquisition sits in a specific layer of the stack, each layer has its own contractual cash-flow rights, and each layer has a specific position in the priority queue when proceeds flow back out at sale or refinance. The layered structure exists because different sources of capital have meaningfully different risk tolerances and return expectations, and matching the right type of capital to the right slot in the structure is what makes an institutional-quality deal pencil at scale.

A commercial real estate stack can be split simply into two categories at the highest level: debt and equity. The debt portion is contractual, with fixed or floating-rate payments due on schedule, secured by a lien on the property, and the lender's claim coming before any equity gets paid. The equity portion is residual: equity holders get whatever is left after debt service is paid, and they take the upside (and the downside) of how the deal performs against the underwriting. For a passive LP in a multifamily syndication, the investment will almost always sit in the equity portion of the stack, either as common equity, as preferred equity, or occasionally as a Class A versus Class B tranche within the LP common pool.

The reason the structure matters this much is that the senior debt portion compounds returns on the equity layers but also concentrates losses there. A stabilized multifamily deal financed with 70 to 75 percent senior debt produces materially higher cash-on-cash on the LP equity than the same deal would unlevered, because the property's net operating income only needs to cover the debt service before the surplus flows to equity. The trade-off is that the same structural leverage works in both directions: if NOI compresses for any reason, the equity layers absorb the shortfall first while the debt service continues to be owed.

Capital stack diagram

The conventional capital-stack diagram shows four layers stacked vertically: senior debt at the bottom, mezzanine debt above it, preferred equity above that, and common equity at the top. The vertical position represents both the order of cash-flow priority during the hold and the order of payout priority on a sale or refinance. The layers at the bottom get paid first and carry the lowest risk and the lowest return. The layers at the top get paid last and carry the highest risk and the highest return.

In practice, most stabilized multifamily syndications use a simpler two-layer stack (roughly 70 to 75 percent senior debt and 25 to 30 percent LP common equity), without any mezzanine debt or institutional preferred equity layers between them. The middle layers appear when the deal-level economics specifically require them: a senior lender that won't size to the LTV the sponsor needs, a sourcing-side seller hold-back the senior won't allow in second-position debt, a heavy-reposition business plan that requires capital between agency LTV limits and the equity check the sponsor wants to raise, or capital from an institutional preferred-equity provider whose risk profile slots between the senior lender's and the LP's. The diagram is the canonical academic version; the actual structure on most deals is a two-tier subset of it.

Senior Debt

Senior debt is the first-mortgage loan against the property and sits at the bottom of the stack, in the senior-most position. It is the largest layer by dollar amount on most institutional multifamily deals, typically 65 to 80 percent of total capitalization depending on the product and the property, and it carries the lowest return and the lowest risk profile of any layer in the structure. Senior debt holders are paid first out of the property's monthly net operating income and are paid first out of refinance or sale proceeds, with the loan secured by a recorded mortgage and lien on the asset itself. If the deal defaults on debt service, the senior lender has the contractual right to foreclose and take the property.

On stabilized multifamily syndications, the senior debt is almost always agency (Fannie Mae's DUS platform, Freddie Mac's Optigo program, or HUD/FHA-insured loans securitized by Ginnie Mae) precisely because the agency products price tighter, offer non-recourse to the sponsor, and amortize over 30 years (or 35 on HUD), which all combine to maximize the cash-on-cash flowing to the equity layers above. Willowdale's typical capital structure runs 70 to 75 percent senior agency debt against 25 to 30 percent LP equity, on 5 to 7 year holds with a refinance liquidity event targeted somewhere in years 2 through 3 when the math supports it. On heavy-reposition or non-stabilized acquisitions where agency won't size to the in-place income, senior debt is more often bridge or balance-sheet bank product, which prices wider and runs shorter but funds the gap until an agency refinance is achievable.

Mezzanine Debt

Mezzanine debt sits between senior debt and the equity layers, paying a contractual interest rate that is meaningfully higher than the senior coupon but lower than the equity hurdle return. The mezz lender's security position is usually a junior lien on the property or a pledge of equity shares in the ownership LLC, and the senior lender has to consent to the mezz being placed at all. The two lenders sign an intercreditor agreement that governs payment priorities, cure rights, and what happens if the deal defaults. Most agency multifamily lenders will not allow mezz at all; bridge lenders and CMBS conduit lenders sometimes will, subject to combined leverage limits.

The reason mezzanine debt exists is that it lets a sponsor stretch above the senior lender's LTV ceiling without diluting the equity layers with more passive capital. If a senior lender will only size to 70 percent LTV but the sponsor's underwriting can carry an effective 80 percent capital stack debt-side, a 10-point mezz layer fills the gap. The trade-off is that mezz costs meaningfully more than senior debt (typically 8 to 12 percent or higher depending on the market and the deal), and the additional debt service compresses the equity layers' cash-on-cash during the hold. For most stabilized multifamily syndications, the math doesn't favor adding a mezz layer when the same incremental capital can come in cheaper as preferred equity or as additional LP common equity. Willowdale's typical structure does not include a mezz layer; the two-tier senior-plus-LP-common stack is what the underwriting consistently picks.

Common Equity and Preferred Equity Investors

Equity sits above all the debt layers in the capital stack and is the residual claim on the property's cash flow and value. It takes the first dollar of loss in a downside scenario and captures all of the appreciation upside above the contractual debt repayments and the preferred return hurdle. The equity layer is itself divided into two sub-categories: preferred equity, which sits just above the debt and below common equity in the payout priority, and common equity, which sits at the top.

Preferred equity is a hybrid between debt and equity. It is contractually paid a fixed preferred return (typically monthly or quarterly) and has payout priority above common equity in the waterfall, but it does not have the senior debt's lien on the property and does not generally share in the deal's appreciation upside. Preferred equity is the structural answer when a deal needs capital that behaves like debt economically (fixed return, priority payment) but cannot legally be placed as debt (senior lender prohibition, intercreditor restrictions, structural limits on additional secured debt). At Willowdale's 69-unit Mill Gardens acquisition in Warner Robins, Georgia, the senior lender would not permit the seller's negotiated hold-back to sit in second-position debt, a standard lender posture that would have killed the deal as originally structured. We restructured the seller's capital as preferred equity in the LLC, sitting above LP common equity in the cap stack but outside the loan structure, paid an 8 percent monthly preferred return, with no participation in equity upside. On the refinance, the preferred equity was paid out in full from refinance proceeds. It is the textbook example of when preferred equity is the right structural tool, and we use it as the reference framing whenever we walk LPs through how creative capital-stack design actually works on a real deal.

Common equity sits at the very top of the stack and is the residual claim after all debt and preferred equity layers are paid. Common equity holders receive whatever cash flow remains during the hold (often as a contractual preferred return on their capital, typically 7 to 9 percent cumulative and compounding in Willowdale's structures), and they share in all the appreciation upside captured at refinance or sale through the deal's promote structure. On many syndications, the LP common equity is itself tranched into Class A and Class B sub-categories with different minimum investment thresholds and slightly different economic terms, with Class A typically at a $50,000 minimum (standard pref and waterfall) and Class B at a $500,000 minimum (higher pref rate and tighter promote). Both classes sit pari passu in the equity stack: they are not stacked above one another in payout priority, they sit alongside one another with different terms within the same LP common-equity layer.

Capital stack example

Consider a hypothetical $10 million multifamily acquisition financed with a 75 percent loan-to-value senior agency loan and the balance funded from LP common equity. The senior debt sleeve is $7.5 million, originated under a 10-year fixed-rate Fannie DUS or Freddie Optigo loan with 30-year amortization and typically one to five years of interest-only at the front. The remaining $2.5 million is the LP common equity raise, often supplemented by an additional 5 percent of the purchase price to cover closing costs, lender-required reserves, the acquisition fee, and operating reserves, which bumps the equity raise on a $10 million purchase to roughly $3 million.

On a deal where the senior lender will only size to 65 or 70 percent rather than 75, the sponsor has two practical paths to fill the gap. Path one adds a preferred equity layer between the senior debt and the LP common: a $500,000 preferred equity check at an 8 percent fixed monthly pref, sitting above LP common in the waterfall but below the senior in the loan structure, reduces the LP common equity raise by the same amount and bridges the leverage gap without taking on the cost of mezzanine debt. Path two simply raises more LP common equity, which is operationally simpler but dilutes the cash-on-cash and IRR returning to the LP common position because more equity is now sharing the same residual cash flow. The right path depends on the deal's specific economics, the pricing of available capital, and the sponsor's view on whether the additional equity dilution is worth avoiding the structural complexity of a preferred-equity layer.

Frequently Asked Questions About The Commercial Real Estate Capital Stack

Capital Stack - Conclusion

The capital stack is the single most important structural document in any commercial real estate deal, because it determines simultaneously how much risk each capital source absorbs, what return that risk earns, and what happens to each layer if the deal underperforms. Most stabilized multifamily syndications run a two-layer stack of senior agency debt at the bottom and LP common equity at the top, which is the structure most accredited investors will actually encounter when they evaluate a passive multifamily investment. The middle layers (mezzanine debt and preferred equity) are real tools, but they appear when a specific deal-level constraint requires them rather than as a default feature of every deal.

The LP-side discipline is to read the capital stack of any deal you're evaluating with the same care you would apply to any other structural document. Understand which layer your check is going into, what the contractual cash-flow rights of that layer are, what the priority position is in the waterfall, and what happens to the position in the downside scenarios the sponsor's underwriting may not be modeling. The cap stack is the structural framework inside which all the other deal economics operate, and a position you understand structurally is materially less risky than one you don't.

Sources

1. Fannie Mae — Small Loans — Multifamily Financing Options
2. Freddie Mac — Borrowers — Get Started with Freddie Mac Multifamily
3. SEC — Private Placements - Rule 506(b)
4. FRED — Interest Rates and Price Indexes; Commercial Real Estate Price Index, Level