Contemporary multifamily complex with glass balconies for Value-Add Retail Bridge Financing: Intermediary Guide
Contemporary multifamily complex with glass balconies, illustrating Value-Add Retail Bridge Financing: Intermediary Guide.

What Is a Medical Office Building (MOB) Loan?

A medical office building loan finances the acquisition, construction, or refinancing of clinical healthcare facilities. Common structures include SBA 504 loans offering up to 90% leverage for physician-owners, as well as conventional bank, life company, and CMBS debt for investor properties.

Key Takeaways

  • Owner-Occupant Leverage: Independent medical practices occupying at least 51% of rentable space can access up to 90% loan-to-cost (LTC) financing via the SBA 504 loan program.
  • Investor Loan Terms: Third-party healthcare real estate investors typically access 65% to 75% loan-to-value (LTV) through conventional banks or 55% to 65% LTV via institutional life companies.
  • Underwriting Standards: Lenders evaluate clinical Debt Service Coverage Ratio (DSCR) between 1.20x and 1.35x, tenant Weighted Average Lease Term (WALT), and specialized tenant improvement (TI) build-out costs ($100 to $250+ per square foot).
  • Tenant Retention: Due to regulatory hurdles, capital-intensive MEP infrastructure, and clinical investments, medical office retention rates historically exceed 80%.

A medical office building loan is a specialized commercial real estate mortgage structured specifically for clinical healthcare facilities, ambulatory surgery centers, and outpatient medical real estate. Common capital structures include SBA 504 debt offering up to 90% leverage for physician-owners, alongside conventional commercial bank, life insurance company, and debt fund executions for third-party healthcare real estate investors. Underwriting evaluates practice collections, clinical infrastructure, and healthcare regulatory compliance alongside standard real estate metrics.

Clinical healthcare properties cannot be evaluated through the lens of generic multi-tenant commercial office space. While standard office leases hinge on corporate headcount and discretionary remote-work policies, medical real estate tenancy depends on licensed clinical delivery, credentialed physician networks, certificate of need (CON) state authorizations, and continuous patient foot traffic. Consequently, commercial lenders classify medical outpatient facilities in a distinct asset class characterized by lower tenant default rates, high tenant retention exceeding 80%, and specialized capital requirements.

Borrowers generally fall into two discrete categories, each requiring different underwriting frameworks and loan covenants:

Outpatient medical office buildings command institutional financing terms due to clinical tenant stickiness and specialized mechanical build-outs.

Physical property characteristics introduce substantial underwriting divergence. Clinical suites demand complex mechanical, electrical, and plumbing (MEP) infrastructure, including backup generators, isolated drainage systems, lead-lined diagnostic imaging rooms, and dedicated medical gas delivery lines. These build-outs elevate replacement costs and make clinical tenants extraordinarily sticky, but they also require lenders to assess the capital expenditure risk if an aging facility requires modernization. To examine how we evaluate broader healthcare asset profiles across inpatient, outpatient, and post-acute segments, explore our comprehensive healthcare and medical office finance guide.

Which Capital Source Fits Your Medical Facility: SBA 504, Conventional, or Institutional Debt?

For independent physician groups occupying at least 51% of a building, the SBA 504 loan program provides up to 90% loan-to-cost financing with 25-year fixed-rate debentures, preserving clinical operating capital. Third-party real estate investors and health-system-affiliated assets rely on conventional commercial banks or life insurance companies, which cap leverage between 65% and 75% loan-to-value while demanding 1.25x to 1.35x debt service coverage ratios and non-recourse structures.

Matching your facility to an optimal capital source requires assessing occupancy status, requested leverage, and partner balance-sheet flexibility. Each debt execution carries rigid qualifying hurdles, variable underwriting timelines, and distinct prepayment terms:

Medical Office Building Underwriting Matrix by Capital Source
Financing Structure Max LTV / LTC Minimum DSCR Term / Amortization Recourse Profile Target Borrowing Profile
SBA 504 Debt 90% LTC (85% for special-use) 1.15x – 1.25x 10- to 25-year fixed / 25-year fully amortizing Full personal recourse (≥20% equity owners) Owner-occupant practices occupying ≥51% of facility
SBA 7(a) Debt 85% – 90% LTC ($5M program limit) 1.15x – 1.25x 10- to 25-year terms / Up to 25-year amortizing Full personal recourse (≥20% equity owners) Practice buy-in plus real estate or heavy equipment needs
Conventional Bank 70% – 75% LTV 1.25x – 1.30x 5- to 10-year balloon / 20- to 25-year amortizing Recourse required; limited burn-off available Investors and strong local practices seeking flexibility
Life Insurance Co. 55% – 65% LTV 1.30x – 1.40x 10- to 20-year fixed / 25- to 30-year amortizing Non-recourse (bad-boy carve-outs only) Stabilized assets tenanted by hospital networks or credit practices
Debt Funds / Bridge 75% – 80% LTC 1.10x – 1.15x (or interest-only) 2- to 3-year floating / Interest-only period Non-recourse options available Value-add lease-up, repositioning, or complex clinical build-outs

For a detailed breakdown of programmatic variables across federal and private lending channels, read our comparison in the healthcare real estate financing guide.

How Does Underwriting Differ for Owner-Occupied Practices Versus Third-Party Investors?

Owner-occupied underwriting bases debt repayment on clinical practice cash flows, evaluating patient collections, physician partner turnover, payer mix, and historical fixed-charge coverage ratios. In contrast, third-party investor underwriting treats the asset as passive real estate, focusing strictly on tenant credit ratings, remaining lease duration, local submarket vacancy, and replacement leasing costs if a provider vacates.

Lenders evaluate risk differently depending on who signs the lease. The following factors dictate how credit officers assess debt capacity for each profile:

1. Owner-Occupied Practice Underwriting

When an operating healthcare business owns the underlying facility (often organized as an operating company/property company structure), lenders underwrite the consolidated financial health of the practice:

2. Third-Party Healthcare Investor Underwriting

When an investor or private capital group acquires a multi-tenant clinical building or executes a sale-leaseback with an independent practice, credit committees isolate the real estate asset from the corporate operations of individual tenants:

To evaluate specialized capital channels for investor-held assets, review our breakdown of third-party medical office building commercial lenders or explore customized solutions in our guide to real estate financing for medical practices.

How to Secure Financing for a Medical Office Building: Step-by-Step

Navigating the financing process for clinical real estate requires aligning practice operations, real estate entities, and underwriting verification. Borrowers should execute the following sequence to secure optimal terms:

  1. Determine Borrowing Structure and Space Allocation: Establish whether the property will be acquired as an owner-occupied facility (requiring ≥51% practice occupancy) or an investor asset. Form separate operating company (OpCo) and property company (PropCo) legal entities if pursuing practice ownership.
  2. Compile Practice Financials and Rent Roll: Prepare three consecutive years of corporate tax returns, year-to-date profit and loss statements, accounts receivable aging reports, payer mix summaries, and in-place commercial lease agreements.
  3. Size Debt Capacity and Model Coverage: Calculate projected Net Operating Income (NOI) against expected debt service to ensure the property meets the lender’s 1.20x to 1.35x DSCR threshold, factoring in practice rent obligations and third-party tenant income.
  4. Select Capital Source and Secure Term Sheets: Solicit competitive loan proposals across CDCs for SBA 504 debt, regional balance-sheet banks, or life companies depending on leverage, recourse, and interest rate preferences.
  5. Complete Third-Party Diligence and Funding: Order clinical property appraisals, Phase I Environmental Site Assessments (ESAs) with medical waste scrutiny, Property Condition Assessments (PCAs), and finalize lender legal documentation prior to loan closing.

Worked Example: How Does an 8-Physician Group Finance a $6,500,000 MOB Acquisition?

An eight-physician surgical group acquiring a 22,000-square-foot clinical facility for $6,500,000 can utilize an SBA 504 loan structure with a 10% cash down payment of $650,000. By occupying 60% of the building and leasing the remaining 40% to an imaging center and laboratory, the group secures a senior bank loan of $3,250,000 and a 25-year fixed SBA debenture of $2,600,000, requiring a combined property Net Operating Income of $585,135 to clear a 1.25x DSCR.

This transaction profile illustrates how independent practices preserve balance-sheet liquidity while securing a permanent clinical home. The scenario assumes an asset acquisition with stabilized complementary tenancies already in place.

An SBA 504 capital stack splits funding into a 50% senior bank mortgage, a 40% SBA/CDC debenture, and a 10% physician borrower equity contribution.

Acquisition and Financing Parameters

Capital Stack and Debt Service Breakdown

The financing breaks down into three distinct tiers:

  1. Borrower Equity Injection (10%): $650,000, funded pro-rata across the eight physician partners ($81,250 per partner).
  2. Senior Bank First Lien (50% LTV): $3,250,000 funded by a commercial bank. Underwritten at a 6.75% fixed interest rate, a 10-year loan term, and a 25-year amortization schedule.

    Annual Senior Debt Service: $269,760 ($22,480 monthly).
  3. CDC / SBA 504 Debenture (40% Net Debenture): $2,600,000 second-lien mortgage funded via an SBA-guaranteed debenture sale. Fixed for 25 years at a note rate of 5.85% (including ongoing CDC and SBA administrative servicing fees).

    Annual Debenture Debt Service: $198,348 ($16,529 monthly).

Total Combined Annual Debt Service: $269,760 + $198,348 = $468,108

Underwriting Coverage Calculation

Commercial lenders require a minimum Debt Service Coverage Ratio of 1.25x across the real estate operating entity:

From initial application and personal financial disclosure submissions to final CDC board approval, third-party appraisal, Phase I environmental clearance, and closing, this transaction requires a standard 45 to 60-day underwriting and closing timeline.

What Key Underwriting Metrics Determine Medical Office Loan Approval?

Medical office building loan underwriting hinges on three critical performance benchmarks: Debt Service Coverage Ratio (DSCR), Weighted Average Lease Term (WALT), and specialized mechanical, electrical, and plumbing (MEP) infrastructure capacity. Credit approval requires balancing real estate valuations against tenant retention and replacement costs, with lenders establishing strict numerical covenants around coverage, lease duration, and capital expenditure reserves.

1. Debt Service Coverage Ratio (DSCR)

Debt Service Coverage Ratio (DSCR) measures the cash flow available to pay current debt obligations. In commercial real estate underwriting, it is calculated as:

DSCR = Net Operating Income (NOI) / Total Annual Debt Service

For medical office real estate, minimum thresholds vary according to credit alignment:

2. Weighted Average Lease Term (WALT)

Weighted Average Lease Term (WALT) measures the average time remaining before tenant leases expire across a commercial building, weighted by the square footage or rental revenue generated by each tenant. In multi-tenant medical office underwriting, lenders require a WALT that provides visibility past loan maturity:

3. Specialized Tenant Improvements and Capital Expenditure

The specialized physical improvements inside a clinical medical office build-out represent both a credit benefit and an underwriting challenge:

To learn more about how institutional debt structures accommodate clinical property upgrades, consult our guide to commercial real estate financing for medical office buildings.

What Documentation Is Required in a Medical Office Mortgage Due Diligence Checklist?

Securing competitive terms on a medical office building loan requires packaging property performance data, physical plant verifications, corporate clinical financials, and personal guarantor profiles upfront. Commercial underwriters review these materials to verify property condition, ensure regulatory compliance, and stress-test the practice’s historical earnings.

1. Real Property Documentation

2. Clinical Practice Financials (For Owner-Occupants)

3. Physical Plant and Environmental Due Diligence

4. Sponsor and Guarantor Verification

Frequently Asked Questions

What are the typical loan terms for a medical office building?

Typical terms depend on the capital source. SBA 504 loans offer up to 90% leverage with 20- to 25-year fixed-rate amortizations for owner-occupants. Conventional commercial bank loans feature 65% to 75% LTV, 5- to 10-year term lengths, and 20- to 25-year amortizations. Institutional and life company debt provides 10- to 20-year fixed maturities with up to 30-year amortizations at 55% to 65% LTV.

Can a physician use an SBA 504 loan to buy a medical office?

Yes. A physician or medical group can utilize the SBA 504 program provided their practice occupies at least 51% of the property’s gross rentable square footage for an existing building, or 60% immediately (expanding to 80% within 10 years) for new ground-up construction. The remaining square footage may be leased out to complementary medical or commercial tenants.

What debt service coverage ratio (DSCR) is required for medical office loans?

Lenders typically require a minimum DSCR between 1.20x and 1.35x. For owner-occupied healthcare properties, underwriters evaluate both property-level NOI and corporate practice cash flow using a 1.20x to 1.25x fixed-charge coverage standard. Investor-owned assets tenanted by private practices usually require a 1.25x to 1.30x DSCR, while investment-grade hospital system leases can price closer to 1.15x to 1.20x.

How does underwriting a medical office building differ from general commercial office space?

MOB underwriting places significantly higher value on tenant stickiness, specialized build-out investment, and regulatory alignment. Unlike traditional office space, medical tenants invest heavily ($100 to $250+ per square foot) into clinical build-outs and face extensive regulatory hurdles to relocate, leading to historical renewal rates exceeding 80%. Underwriters scrutinize payer mix, physician succession plans, and hospital system proximity rather than general corporate office employment metrics.

What percentage down payment is needed to buy a medical office building?

Down payment requirements range from 10% to 35%. Physician groups using an SBA 504 loan can acquire an owner-occupied facility with as little as a 10% equity injection (15% if the real estate is classified as a single-use specialized facility or if the business is a startup under two years old). Non-occupant commercial real estate investors funding through conventional banks or institutional lenders typically must contribute 25% to 35% equity.

References

Sources reviewed while researching medical office building loan, taken from the US search results on 2026-10-31.

  1. Medical Office Building Loans | Prosperity Bank — prosperitybankusa.com
    [Medical Office Building Loans](https://www.prosperitybankusa.com/medical-office-building-loans/)

    # Medical Office Building Loans
    The assistance you need to acquire, expand or renovate space

    [Learn More Below](https://www.prosperitybankusa.com/medical-office-building-loans/#Benefits-and-Features)

    Flexible Terms

    Up

  2. Medical Office Building Loans | Healthcare Real Estate Financing — avanacompanies.com
    Loans run approximately $1M to $18M, with mid-term options up to 10 years and long-term up to 25 years. Leverage goes up to 75% LTV, or up to 90% of project …
  3. Commercial Real Estate Loans for Medical Buildings — goamplify.com
    A commercial term loan is another option for developing or acquiring health care commercial real estate. These types of loans typically include:.
  4. Commercial Real Estate Loans – Henry Schein Medical Finance — medicalfinancial.henryschein.com
    Commercial Healthcare Real Estate Financing for Doctors and Medical Professionals. Medical Real Estate Loans with up to 100% Financing.
  5. How to Finance the Build-Out of a New Medical Office or Facility – USB — unionsavings.com
    Once your facility is built or acquired, a long-term commercial real estate loan can help you finance the property over time. These loans are well-suited for:.
  6. Medical Office Building Loan Guide: Best Options 2026 — loanguys.com
    # Medical Office Building Loan Guide: Best Options 2026
    ![](https://www.loanguys.com/blog/loans-for-medical-office-building-investors)

    Medical office building investors run into a wall traditional banks build on purpose: tenant concentration, healthcare-specific build-outs, and physician borrowers who don’t fit a stan

  7. Medical Office Commerical Loans — commercialrealestate.loans
    Commercial real estate loans for medical offices typically start at $500,000 and offer up to 90% LTV, while SBA loans start at $30,000 and offer amortizations …
  8. Help with construction loan planning for new build medical office – Reddit — reddit.com
    [Skip to main content](https://www.reddit.com/r/CommercialRealEstate/comments/1wuzp5p/help_with_construction_loan_planning_for_new/#main-content)Help with construction loan planning for new build medical office : r/CommercialRealEstate

    # Help with construction loan planning for new build medical office
    I bought the lo

  9. Healthcare Real Estate | Project Finance – Live Oak Bank — liveoak.bank
    Medical Outpatient Buildings (MOBs): Loans for the acquisition, development, or renovation of office spaces designed for healthcare providers. Surgery …

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Featured Snippet (Paragraph) 85% H2: ‘What Is a Medical Office Building (MOB) Loan?’ followed by a concise 35-word definition emphasizing SBA 504, conventional bank, and healthcare-specific tenancy underwriting.
Comparison Table 75% A structured underwriting comparison matrix outlining LTV, DSCR, amortization, and terms across SBA 504, SBA 7(a), conventional commercial banks, and life company debt.
People Also Ask 90% Dedicated FAQ section addressing medical tenant build-out allowances, owner-occupancy rules (51% for SBA), and healthcare DSCR calculations.
AI Overview 80% Clear hierarchical H2s and structured bullet points defining MOB underwriting factors: specialized tenant improvements, regulatory compliance, hospital proximity, and lease terms.
Expanded Sitelinks 60% Distinct landing page sub-navigation covering Owner-Occupied MOBs, Medical Office Construction Loans, Refinancing Medical Centers, and SBA Healthcare Loans.