Capital Stack

What Is Capital Stack?

Every real estate deal has a capital stack, even if it's just a simple bank mortgage and a down payment. The concept becomes critical in commercial deals, syndications, and larger investments where multiple sources of capital combine to fund a single acquisition. The stack has four potential layers, from top (lowest risk, lowest return) to bottom (highest risk, highest return): senior debt, mezzanine debt, preferred equity, and common equity. Senior debt — the first mortgage — sits at the top with first claim on the property and typically provides 60-75% of the purchase price at 5-7% interest. Below that, mezzanine debt fills the gap at 10-18% interest. Preferred equity gets a fixed return (8-12%) before common equity receives anything. Common equity — the sponsor's and investors' capital — takes whatever remains after everyone above gets paid. Understanding the capital stack tells you exactly where your money sits, what your risk is, and who gets paid before you do.

The capital stack is the complete structure of debt and equity used to finance a real estate investment, organized in layers from the most secure position (senior debt) to the highest-risk position (common equity).

At a Glance

Senior Debt: First mortgage, 60-75% LTV, lowest risk, lowest return (5-7% interest)
Mezzanine Debt: Subordinated loan, 10-18% interest, secured by ownership interest pledge
Preferred Equity: Equity with priority return (8-12%), paid before common equity but after all debt
Common Equity: Sponsor and investor capital, last to be paid, highest return potential (15-25%+ IRR)
Risk Direction: Risk increases from top to bottom; returns increase from top to bottom
Payment Priority: In liquidation or cash flow distribution, the top of the stack gets paid first

How It Works

Think of the capital stack as a waterfall. Money flows in from the property's income or sale proceeds and cascades down through each layer. Senior debt gets paid first — mortgage principal and interest. If there's money left, mezzanine debt gets its interest payment. Next, preferred equity receives its priority return. Whatever remains flows to common equity holders — the sponsor and limited partners.

In a simple residential rental, the capital stack has two layers: a conventional mortgage (senior debt at 80% LTV) and the investor's down payment (common equity at 20%). The bank gets its $1,400 monthly mortgage payment before the investor sees any cash flow. If the property sells, the bank's remaining loan balance is paid first, and the investor keeps the rest.

Commercial deals add complexity. A $20 million apartment complex might have this capital stack:

Senior Debt: $13 million first mortgage (65% LTV) at 6.0% from a CMBS lender — annual debt service of $780,000
Mezzanine Debt: $2 million subordinated loan (10% of stack) at 14% — annual interest of $280,000
Preferred Equity: $2 million (10% of stack) at 10% preferred return — annual pref of $200,000
Common Equity: $3 million (15% of stack) from the sponsor ($600K) and limited partners ($2.4M)

If the property generates $1.8 million in NOI, the distributions flow: $780,000 to the senior lender, $280,000 to the mezz lender, $200,000 to preferred equity holders, and the remaining $540,000 to common equity. That $540,000 return on $3 million of common equity is an 18% cash-on-cash return — amplified by the leverage from the layers above.

Now consider the downside. If NOI drops to $1.1 million, the senior lender still gets $780,000 and the mezz lender gets $280,000 — consuming $1.06 million. Only $40,000 remains for preferred equity (which is owed $200,000), and common equity gets nothing. If the property must sell at a loss, the liquidation follows the same priority. Senior debt is repaid first, then mezz, then preferred equity, then common equity. Common equity absorbs losses first and can be completely wiped out before any other layer takes a hit.

This risk-return tradeoff is the fundamental principle of the capital stack. Each layer accepts a different risk level and receives a corresponding return. Investors must understand where their capital sits in the stack to accurately assess their risk.

Real-World Example

Summit Real Estate Partners raised capital to acquire a 180-unit apartment complex in Raleigh, North Carolina, for $24.5 million. The property was a 2002-vintage Class B community with stable occupancy at 93% and below-market rents averaging $1,180 per unit.

The capital stack was structured in four layers:

Senior Debt — $16.2 million (66% of total capitalization): A Fannie Mae loan at 5.85% with a 10-year term and 30-year amortization. Monthly debt service: $95,600. The lender's risk is protected by first lien position and a 34% equity cushion.

Mezzanine Debt — $2.4 million (10%): A private credit fund provided subordinated financing at 13% interest-only. Annual cost: $312,000. Secured by a pledge of Summit's membership interest in the property LLC.

Preferred Equity — $2.1 million (9%): Four high-net-worth individuals invested at a 9% preferred return plus participation in profits above a 15% IRR. Annual preferred distribution: $189,000.

Common Equity — $3.8 million (15%): Summit contributed $760,000 (20% of equity, or 3.1% of total capitalization) and 42 limited partners contributed $3.04 million through a 506(b) private placement. Returns to common equity flow after all senior layers are satisfied.

Year-one NOI was $1.92 million. After $1.147 million in senior debt service, $312,000 in mezzanine interest, and $189,000 in preferred equity returns, common equity received $272,000 — a 7.2% cash-on-cash return. Modest, but the business plan projected rent increases to $1,420/unit over three years, which would push NOI to $2.58 million and common equity cash flow to $932,000 (24.5% cash-on-cash return). The leverage from the upper stack layers amplifies both the upside and the downside.

Pros & Cons

Advantages

Enables acquisition of properties far larger than available equity by layering multiple capital sources
Each stack position offers a distinct risk-return profile, attracting different investor types to the same deal
Higher leverage (more debt in the stack) amplifies equity returns when the deal performs as projected
Sophisticated stack design can reduce the amount of equity needed from 35-40% to 15-20% of purchase price
Allows sponsors to retain larger ownership percentages by using cheaper debt capital instead of selling equity

Drawbacks

Complex capital stacks increase legal costs, intercreditor negotiations, and ongoing reporting requirements
Higher leverage amplifies losses — common equity is wiped out first, and it can happen fast in a downturn
Multiple capital layers mean multiple stakeholders with competing interests and different default remedies
Mezzanine debt and preferred equity carry significant costs (10-18%) that eat into property cash flow
Intercreditor disputes between senior and subordinate lenders can delay resolution during distressed situations

Watch Out

Leverage Illusion: A deal showing 25% projected returns to common equity often achieves those numbers only because of heavy leverage. Strip out the debt layers and look at unlevered returns — if the property yields 7% unlevered and the stack pushes common equity to 25%, the leverage is doing the heavy lifting. That same leverage works in reverse during a downturn.
Priority Misunderstanding: Many passive investors in syndications don't understand their position in the capital stack. A limited partner investing common equity is last in line for distributions and last to recover capital in a sale. Ask the sponsor exactly where your money sits and what layers are senior to you.
Refinance Risk on Subordinate Debt: Mezzanine debt terms of 2-5 years create refinance pressure. If the senior lender's replacement won't allow subordinate debt, the mezz must be repaid — requiring additional equity, a property sale, or a lender who permits the structure.
Capitalization Rate Compression Dependency: Many capital stack projections assume cap rate compression (lower cap rates = higher property values) at exit. If cap rates stay flat or expand, the projected equity returns evaporate and the leverage in the stack works against investors.

Ask an Investor

The Takeaway

The capital stack determines who gets paid, in what order, and who bears the losses. For passive investors, understanding your position in the stack is more important than understanding the property itself. Senior debt investors trade high returns for safety. Common equity investors accept the highest risk for the highest potential reward. Every layer in between — mezzanine debt and preferred equity — calibrates the risk-return tradeoff along that spectrum. Before investing in any syndication or commercial deal, map the complete capital stack and stress-test it: what happens to your layer if NOI drops 20%? If the property sells for 15% less than projected? The answers tell you whether the return justifies the risk.