The Quick Read: A portfolio DSCR lender counts a duplex as one property and a fourplex as one property, so together they form a two-property pool with six rental doors, and the lender adds every unit’s rent, adds every building’s payment, and tests the pooled ratio against the program floor. Rent from all units goes on top, and the full payment on each building goes on the bottom. Subject to lender guidelines, that is the whole counting rule.
- A building is one property no matter how many units it holds, as long as it has four units or fewer.
- The 30-year portfolio DSCR loan covers 2 to 20 properties under one note, so a duplex plus a fourplex meets the minimum count.
- Coverage is measured on the pool, so a stronger building can offset a weaker one.
- Every building still needs its own lease or an appraiser-supported market rent.
- Clearing the coverage floor is not the same as positive cash flow.
Why Does the Lender Count Buildings, Not Doors?
The lender counts buildings because the loan is secured by buildings. A duplex sits on one parcel with one deed, one tax bill, and one insurance policy. A fourplex works the same way. Each building is a single piece of collateral, no matter how many leases sit inside it.
Four units or fewer is the key line. Residential-style DSCR underwriting covers one to four units, and it measures the gross rent used for lender review against PITIA. PITIA is principal, interest, taxes, insurance, and any association dues. At five or more units, a building generally moves to commercial underwriting. That method looks at net operating income instead of gross rent, and it is a different exercise.
This is where investors mix up two ideas. One idea is how many units a building has. The other is how many properties a loan covers. The first decides which underwriting method applies. The second decides whether a loan is reviewed as a portfolio loan at all.
DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. That is also why owner-occupied property is ineligible inside a pool, which matters if you hoped to live in one of the units.
Key Terms Defined
Property: One parcel with one deed. A duplex is one property and so is a fourplex.
Unit or door: One separately leased living space inside a building. A fourplex has four.
DSCR (debt service coverage ratio): rent used for lender review divided by the building’s monthly obligation. A ratio of 1.00 means rent equals the payment.
PITIA: Principal, interest, taxes, insurance, and any association dues. This is the full monthly obligation used as the denominator.
Pooled ratio: Total rent from every property in the loan divided by total debt service on all of them.
Release: The lender’s permission to remove one property from a multi-property loan, usually on a payoff price set in the loan documents.
Blanket loan: One note secured by several properties, where each property secures the whole debt.
How the Math Works With a Duplex Plus a Fourplex
Run the numbers on an illustrative pair, using index points instead of dollars. These are modeled assumptions, not market data. Say the duplex carries a debt-service index of 40 and the fourplex carries 60.
| Building | Units | Rent index | Debt index | Ratio |
|---|---|---|---|---|
| Duplex | 2 | 44 | 40 | 1.10x |
| Fourplex | 4 | 57 | 60 | 0.95x |
| Pool (both) | 6 | 101 | 100 | 1.01x |
Tested alone, the duplex clears 1.00 comfortably and the fourplex does not. Pooled, the two buildings together sit at about 1.01x. That is the practical benefit of a pool. Strong rent on one building can carry a weaker one, because coverage in the portfolio program is measured on pooled rent against pooled debt service.
Now change one input. Say the fourplex has a vacant unit, and the appraiser’s market rent for that unit comes in lower than expected.
| Scenario | Fourplex rent index | Pooled ratio |
|---|---|---|
| Base case | 57 | 1.01x |
| Weaker fourplex rent | 51 | 0.95x |
At 0.95x pooled, the pair would sit under the 1.00 floor the 30-year portfolio program uses. The structure would have to change, for example a different mix of buildings, lower leverage, or a different loan path that the lender reviews on its merits.
The contrast with separate loans matters here. On a standard loan against a single rental, the fourplex at 0.95x would be tested alone. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. Rent from the duplex would not rescue the fourplex on separate notes, because each loan sees only its own building.
Inside a pool, a building below 1.00 can sit there when the pooled coverage, the leverage, and the terms are what underwriting tests, subject to underwriting. The pool still has to pass as a whole.
How Underwriting Counts Each Building, Step by Step
The pooled number looks simple, but it is built from per-building work. Each building goes through the same steps.
1. Classify the building. One to four units gets residential-style treatment. Five or more units goes to commercial analysis. Mixed-use and commercial property are not eligible in the pool.
2. Order the appraisal. For two to four unit buildings, the standard appraisal report is the small residential income property form. Fannie Mae’s Selling Guide names that form as the report for two-to-four unit properties, including units in condo, PUD, and co-op projects. The form itself breaks out each unit by rooms, bedrooms, baths, and square footage, and it asks whether the property is under rent control. The form also carries comparable rent data and gross rent multiplier analysis. DSCR lenders borrow these forms, but the coverage rules come from the lender, not the agency.
3. Set rent per unit. A leased unit typically uses the lower of the lease or the appraiser’s market rent. A vacant unit uses the market rent, so the building does not have to be fully leased. The unit figures add up to one gross monthly rent per building.
4. Compute coverage. Total rent divided by the building’s PITIA gives the building’s ratio. The pool’s ratio uses the sum of all rents over the sum of all PITIA.
5. Size the loan. Value sets the leverage cap, and coverage can cap the loan on its own. Thin rent can limit proceeds even when leverage looks fine.
6. Collect documents. Expect leases, a rent roll, evidence of rent actually received, unit facts, entity documents, and asset statements.
Across the network, most single-property investment purchases land at 75% to 80% LTV, and reserves run around six months of PITIA, subject to lender guidelines. Those are single-property figures. The pooled structures below carry their own numbers.
Units, Properties, Loans: Three Different Counts
The same two buildings count differently depending on what is being counted. This trips up more investors than the math does.
| What is counted | Duplex + fourplex |
|---|---|
| Units (doors) | 6 |
| Properties | 2 |
| Loans with one note | 1 |
| Loans with separate notes | 2 |
The 30-year portfolio loan counts properties. It covers 2 to 20 properties under one note, so two buildings meet the minimum. The rental portfolio term loan, described next, has a threshold of five or more rental properties or units under one loan. Six doors across two buildings may reach that threshold, subject to lender guidelines. The unit count can matter for one program and the property count for another, so ask which one the lender uses.
Which Portfolio Structure Fits Two Buildings?
Two portfolio structures exist across the network, and they behave differently. Both are program ceilings and floors, never quotes.
| Feature | 30-year portfolio loan | Rental portfolio term loan |
|---|---|---|
| Count | 2 to 20 properties | 5+ properties or units |
| Loan size | $300,000 to $5,000,000 | $500,000 to $50,000,000 |
| Leverage | Up to 80% (purchase, rate-and-term) | Up to 75% |
| Term | 30-year | 3, 5, 7, 10-year fixed |
| Coverage | 1.00 floor on the pool | Reviewed on the pool |
Larger balances are reviewed individually in both structures. The 30-year loan offers fixed or adjustable terms, with an interest-only period available. The term loan ends in a balloon at maturity. It also comes in recourse and non-recourse forms. A non-recourse loan looks to the real estate, with recourse limited to carve-outs such as fraud and bankruptcy. A recourse loan carries a personal guarantee. The term loan uses yield maintenance for prepayment, which means paying out early costs more, and it holds reserves for taxes, insurance, and capital expenditures.
Both structures accept single-family, two-to-four unit, condo, and townhome properties, and the term loan also takes small multifamily. Some structures require a special-purpose entity, typically an LLC, subject to program terms. Credit floors on pools start at 640, and 680 or 720 shows up on some structures.
Cash-out on a portfolio loan never exceeds 75% of the pooled value. In the first six months of ownership, the cash-out amount is limited by the seasoning rule, and leverage is limited to 90% of total cost. From six to twelve months, it is limited to 100% of cost. A rate-and-term refinance carries no cost restriction.
Where the General Rule Breaks
The counting rule holds in most files. These are the places it bends.
A vacant unit. The appraiser’s market rent carries that unit. A single empty door can move a fourplex’s ratio noticeably, because each unit is a large share of the building’s rent.
An above-market lease. The lower-of rule means a lease above market does not raise rent used for program review. A below-market lease that you assume at purchase can pull the number down.
Rent control. The appraisal form asks whether the property is rent-controlled, so unusual lease terms surface in underwriting.
A short-term-rental unit. Some programs want every unit on a long-term lease, and others accept a mix with overlays. For how lenders evaluate that income, see Lendmire’s piece What Counts As Short Term Rental Income For A Lender?. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income.
A condo or PUD building. A two-to-four unit building inside a project needs extra information alongside the appraisal.
A fifth unit. A five-unit building leaves residential-style underwriting and gets commercial, income-based analysis. The term loan lists small multifamily among eligible property types, subject to underwriting.
Ineligible property. Manufactured homes, log homes, and barndominiums are not offered in these programs. Owner-occupied property, mobile homes, co-ops, mixed-use property, and commercial property are ineligible inside a pool.
Experience adds one more pattern. On pooled files, the weak building is rarely the one the investor expected. It is often the one with a stale lease, a vacant unit, or a unit-mix mismatch on the appraisal. The mismatch shows up when the comparables are two-bedroom units and the subject units are one-bedroom. Confirming the rent evidence building by building before submission avoids a surprise on the pooled number.
What Happens If You Sell One Building Later?
Selling one building out of a pool follows the loan documents. Partial releases, substitutions, and sales out of the pool all run on the lender’s release terms. The release price runs above the property’s allocated balance, and the remaining portfolio must still cover its debt service. A pool built around one strong building can become harder to unwind if you sell that building first.
That is a real tradeoff against separate loans. A pool can add flexibility on coverage, but it ties the buildings together on exit. Tax treatment varies; consult a qualified professional before selling.
What the Decision Looks Like in Practice
Choose the structure that matches how you plan to hold the buildings. A few practical comparisons help.
If both buildings clear coverage alone, separate loans keep things clean, and you lose nothing by skipping the pool. If one building clears with room to spare and the other falls short, a pooled structure may fit, because the pooled ratio is what the lender tests. If you plan to sell either building within a few years, read the release terms before you commit.
A bigger down payment helps coverage, since it shrinks the loan and the monthly obligation. It does not erase leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear two tests at once: enough equity and enough rental coverage.
Clearing 1.00 is also not the same as cash flow. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capital expenditures sit outside the calculation, so budget for them separately. A fourplex often shows stronger coverage than a similar single-family rental because several rents share one tax bill and one insurance policy, but that is a ratio advantage, not a profit guarantee.
The complete DSCR loans guide covers the rest of the program basics.
Frequently Asked Questions
Is a fourplex one property or four?
It is one property. The lender counts the building, with one deed, one tax bill, and one insurance policy. The four units matter for rent, since each lease or market rent adds to the numerator, but the fourplex counts once toward the number of properties in a pool.
Can I pool a duplex and a fourplex with single-family rentals?
Yes, mixed pools are accepted, subject to lender guidelines. Single-family, two-to-four unit, condo, and townhome properties can sit together. The 30-year portfolio loan takes 2 to 20 properties under one note, and each property still needs its own lease or appraiser-supported market rent.
Do vacant units hurt?
A vacant unit does not block the loan, because the appraiser’s market rent stands in for the missing lease. It can still lower the ratio if market rent comes in light. In a pool, the vacancy affects the blended number rather than that building alone.
Can I live in one unit?
Not in a pool. Owner-occupied property is ineligible inside the portfolio structures, and DSCR loans are written for non-owner-occupied investment properties. If you plan to occupy a unit, a different loan type is the better fit.
What if the pool passes but one building fails on its own?
The pool is what gets tested, so a building below 1.00 can sit in it when the pooled coverage, leverage, and terms are what underwriting reviews, subject to underwriting. Each building still needs its own rent evidence. A weak building also raises release questions if you later want to sell the strong one.
Next Step
If you are buying or refinancing rental properties and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals. As a broker, it arranges financing through select lenders in its wholesale network, across 41 markets including Washington, D.C. This is not a commitment to lend, and every file is underwritten individually.
About Lendmire
Lendmire (NMLS# 2371349) is a DSCR-focused mortgage broker that helps arrange investor financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. DSCR eligibility is generally reviewed by the lender around the property’s rental income rather than personal income documentation, subject to lender guidelines — which works for self-employed investors, LLC operators, and portfolios above four financed properties. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How to Handle Vacancies Before a DSCR Portfolio Loan · Can You Swap One Rental for Another in a Portfolio DSCR Loan? · How to Plan a DSCR Portfolio Refinance a Year Before the Balloon
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.