Mixed-Use DSCR Rules: Commercial Unit Caps and Why Vacant Retail Kills the File
A mixed-use property with two residential units and a ground-floor coffee shop looks like a straightforward DSCR rental loan until underwriting sees “retail — currently vacant” on the rent roll.
That one line just killed the file.
DSCR lenders will finance mixed-use properties, but the commercial portion is capped at 25% to 30% of the building’s net rentable area — and every square foot of that commercial space must be leased and producing rent. A vacant storefront doesn’t just reduce your DSCR. It disqualifies the property entirely.
What Mixed-Use Means to a DSCR Lender
Mixed-use is any property combining residential and commercial tenants under one roof. The most common configurations: a four-unit building with a ground-floor retail tenant, a duplex with an office suite, or a three-flat with a restaurant below.
Most DSCR programmes allow mixed-use with two constraints:
- Commercial area cannot exceed 25–30% of net rentable square footage
- Every commercial unit must be occupied and rent-producing at closing
The 25–30% figure is not a recommendation. It is a hard cap written into the programme guidelines. A property with 35% commercial space does not get worse terms — it gets rejected outright, regardless of rent or DSCR.
How the Commercial Cap Is Calculated
The calculation uses net rentable area, not gross building size. Common areas, hallways and mechanical rooms are excluded.
Example property:
| Unit Type | Square Footage | Monthly Rent |
|---|---|---|
| Residential Unit 1 | 850 sq ft | $1,650 |
| Residential Unit 2 | 850 sq ft | $1,650 |
| Residential Unit 3 | 800 sq ft | $1,550 |
| Ground-floor retail | 900 sq ft | $2,400 |
| Total | 3,400 sq ft | $7,250 |
Commercial percentage: 900 ÷ 3,400 = 26.5%. This property qualifies under a 30% cap, fails under a 25% cap.
If the retail unit were 1,100 square feet instead, the commercial share would be 31.4% — and no amount of rent would salvage the file. The programme simply does not finance properties above the threshold.
Why Vacant Commercial Space Is an Automatic Decline
A vacant residential unit reduces rental income. A vacant commercial unit makes the property ineligible for DSCR financing, even if the residential DSCR alone would qualify.
The reason: DSCR underwriting relies on current, verifiable income. The lender needs a signed lease, proof of rent payments, and a tenant currently in possession. Proforma rent projections are not accepted. If the commercial space is dark, the property does not meet the occupied-commercial requirement, and the application is declined before DSCR is even calculated.
This is not negotiable. The guidelines do not say “may require” or “prefer”. They say the commercial units must be leased at closing.
The DSCR Arithmetic on a Mixed-Use Property
Using the property above, assume:
- Purchase price: $425,000
- 75% LTV DSCR loan: $318,750
- Rate: 7.25%
- 30-year amortisation
- Property taxes: $475/month
- Insurance: $185/month
- Association dues (mixed-use buildings often have them): $120/month
Monthly debt service (principal + interest): $2,175
PITIA (principal, interest, taxes, insurance, association): $2,175 + $475 + $185 + $120 = $2,955
Total rental income: $7,250
DSCR: $7,250 ÷ $2,955 = 2.45
That is a strong file — well above the 1.0 minimum. But now remove the retail tenant. Residential income alone is $4,850. DSCR falls to 1.64. Still comfortably above 1.0, and the property would easily qualify as a straight residential triplex.
Except it is not being underwritten as a triplex. It is being underwritten as mixed-use, and mixed-use guidelines require all commercial units to be leased. The file is declined regardless of the residential DSCR.
When Mixed-Use DSCR Financing Is the Wrong Call
Do not pursue DSCR financing on a mixed-use property if:
- The commercial tenant’s lease expires within six months of closing. Some lenders require at least 12 months of remaining term.
- The commercial space is vacant and you plan to lease it post-closing. Get the tenant in place and producing rent for 90 days first, then refinance.
- The commercial portion exceeds 30% of net rentable area. The property does not fit the programme.
- You are buying a building currently zoned residential and converting ground-floor units to retail. That introduces a zoning and use-change issue that DSCR lenders do not underwrite.
- The commercial tenant is your own business. Most lenders treat self-occupied commercial space the same as vacant space — the income is not arm’s-length rent.
In those cases, conventional multifamily financing, a commercial loan, or bridge financing with a path to stabilisation and a later DSCR refinance are the better plays.
The Lease Documentation Lenders Require
For the commercial units, expect to provide:
- Executed lease with at least six months remaining (often 12+ months required)
- Rent roll showing tenant name, unit, square footage, lease term and current rent
- Three months of bank statements showing rent deposits from the commercial tenant
- Certificate of occupancy confirming the space is legally allowed for commercial use
If the lease is new or the tenant just moved in, the lender may require additional financial documentation on the tenant’s business to verify stability. Month-to-month commercial leases are typically rejected.
What Happens If the Commercial Tenant Leaves After Closing
Once the loan closes, tenant turnover is your problem, not the lender’s. DSCR loans are non-recourse in most cases and are secured by the property, not by ongoing income verification. The lender does not re-underwrite your DSCR every year.
But if you fall behind on payments and the property ends up in foreclosure, the lender will look at the rent roll during workout discussions. A property with dark retail and residential vacancies has less equity cushion and fewer exit options.
The Bottom Line
Mixed-use properties are financeable under DSCR loan programmes, but the underwriting rules are stricter than for straight residential. The commercial portion is capped at 25–30% of net rentable area, and every commercial unit must be leased and producing rent at closing.
A vacant retail space does not just lower your leverage or cost you rate. It disqualifies the property outright. If you are under contract on a mixed-use building with a dark storefront, your options are to get a signed lease and rent payments flowing before closing, or to pursue a different loan product.
For current DSCR programme terms, see our rates page. To discuss a specific mixed-use property, submit a scenario.