Multifamily
for first-timers.

What is commercial multifamily?

Commercial multifamily is residential rental real estate with five or more units. Smaller properties (2-4 unit duplexes, triplexes, fourplexes) are classified as residential for most lending and regulatory purposes; 5-plus-unit properties are classified as commercial and access different financing programs.

Commercial multifamily ranges from 5-unit neighborhood buildings to 500-unit institutional communities. It is the largest single sector of commercial real estate by dollar volume, accounting for roughly a third of annual CRE transaction volume. It benefits from consistent housing demand and from favorable financing through Fannie Mae and Freddie Mac agency programs.

Why multifamily is the default institutional CRE class

• Resilient demand — people live somewhere regardless of the economy.
• Agency debt availability (Fannie/Freddie) provides long-term, fixed-rate, non-recourse loans at competitive spreads.
• Tax treatment — depreciation, 1031 deferral, and cost segregation deliver material tax shelter.
• Liquid exit — active institutional buyer pool at nearly every size.
• Scalable — from a 10-unit building to a 10,000-unit portfolio, the operating model is substantially the same.

How do you value a multifamily property?

The primary valuation method is income capitalization: apply a market cap rate to stabilized NOI. For a property generating $500,000 of NOI in a market where comparable properties trade at a 5.5% cap rate, implied value is approximately $9,090,000 ($500,000 / 0.055).

Secondary and cross-check methods:

• Price per unit. Useful for quick comparables in homogeneous markets.
• Price per square foot. Less common in multifamily; more common in condo and urban product.
• Gross Rent Multiplier (GRM). Price ÷ gross annual rent. Simple and useful in small multifamily where expense structures are similar across comparables.
• Replacement cost. What would it cost to build the same property today? Compares to fundamental value floor.

How do you read a multifamily T-12?

The T-12 (trailing 12 months) is the single most important document in multifamily underwriting. It shows actual monthly revenue and expenses for the past year — the historical fact, not the pro forma story.

Revenue side

• Gross potential rent (GPR). What rent would be at 100% occupancy and full market rates.
• Vacancy loss. Actual dollars of rent not collected due to vacancy.
• Concessions. Discounts given to fill units. Often pushed off the rent roll to inflate stated rent.
• Bad debt. Rents uncollected due to delinquent tenants.
• Other income. Pet fees, parking, storage, laundry, RUBS (ratio utility billing), application fees, late fees. Sometimes padded with one-off items.

Expense side

• Property taxes. Verify current assessment and reassessment risk post-sale. Many states reassess at transfer — this materially changes NOI.
• Insurance. Has increased significantly in coastal and wildfire-exposed markets. Get a bindable insurance quote before closing, not just the current policy amount.
• Utilities. What portion is owner-paid versus tenant-paid or RUBS-billed?
• Repairs and maintenance. Low R&M on an older property signals deferred maintenance. Normal is $500-900 per unit annually for older product.
• Payroll. On-site staff for 50+ unit properties. Verify actual payroll, not owner-absorbed labor.
• Management fee. Third-party management is 3-5% of effective gross income. Owner-managed T-12s sometimes omit this fee — add it back for arms-length underwriting.
• Contract services. Landscaping, pest control, pool service, snow removal.
• Replacement reserves. $200-350 per unit annually for stabilized properties. Often missing from owner pro formas.

Red flags in a T-12

• Unusually low management fees or zero replacement reserves (suggests owner self-management with no true cost)
• Insurance line that doesn't match current market (post-renewal surprises)
• R&M running well below benchmarks (deferred maintenance buildup)
• Concessions netted against rent rather than shown as a line item (masks true vacancy)
• One-time revenue items boosting a trailing period
• Expense category missing entirely (marketing, training, office supplies for on-site staff)

How do you underwrite the pro forma?

Every pro forma is a story. Your job is to decide whether the story is plausible. Test each assumption:

• Rent growth. What is projected vs. what does the submarket actually support? 3% annual growth in a submarket running at 1% is optimistic.
• Vacancy stabilization. If current vacancy is 10% and pro forma assumes 5%, what is the execution plan? How long does lease-up take?
• Rent push on renewed/turned units. Is the $200/month premium above existing rent achievable? Check new-lease rent data, not just asking rent.
• Expense assumptions. Does pro forma apply realistic inflation? Insurance is running 8-15% annually in many markets — flat-line assumptions are unrealistic.
• Capital expenditure. Are planned renovation dollars adequate for the unit interiors, exteriors, systems? A $3,000/door renovation budget does not produce a $200/month rent premium.
• Exit cap. Is the assumed exit cap rate realistic relative to the going-in cap? Use a 25-50 bp higher exit cap for stress-testing.

If the deal only works on best-case pro forma, it is a bad deal. If it still works with realistic rent growth, moderate vacancy, normal expenses, and a 50-bp-wider exit cap — now you have a deal worth underwriting in detail.

How does agency debt work?

Fannie Mae (DUS program) and Freddie Mac (Optigo program) provide the most competitive debt for multifamily. Key features:

• Term: 5, 7, 10, 12, 15, or 30 years (30-year mainly on smaller balance).
• Amortization: 30-year schedule, often interest-only for a portion of the term.
• Leverage: up to 75-80% LTV for traditional properties, 80-85% for affordable programs.
• Non-recourse: subject to standard bad-boy carve-outs.
• Assumable: yes, subject to lender approval and assumption fee.
• DSCR minimum: typically 1.25x on stressed rates, with lower for affordable or certain green programs.

Agency debt is not the only option. Life insurance companies, CMBS, portfolio banks, and credit unions all participate in multifamily lending. Agency is dominant in the 5+ unit market but not universal.

What is value-add multifamily?

Value-add multifamily is the investment strategy of buying a Class B or C property, investing capital to upgrade unit interiors and common areas, and pushing rents to create NOI growth. The theory is classic: buy at a higher cap rate (because of the property's current condition), improve NOI, sell (or refinance) at a tighter cap rate because the property now resembles higher-class stabilized product.

Execution variables

• Renovation scope. Light (paint, flooring, countertops, fixtures) at $5-10K per unit vs. heavy (kitchens, baths, appliances, smart-home) at $12-25K per unit.
• Rent premium achieved. The renovation only works if the achieved rent premium exceeds the cost of capital on the renovation dollars over the hold. If $10K of renovation produces a $100/month premium ($1,200/year), the return on that $10K is 12% — attractive.
• Turnover pace. Value-add typically captures renovation premiums on lease turnover. Annual turnover of 40-60% is typical; accelerating turnover is rarely feasible.
• Operating upside. Expense reductions (utility programs, bill-back, vendor renegotiation) can contribute meaningfully.

How do you choose a multifamily market?

Market selection is the single largest driver of long-term multifamily returns. Four factors to evaluate:

• Job growth. Multifamily demand is a function of household formation, which follows employment. Metros with 1.5%+ annual job growth materially outperform metros with flat or declining employment.
• Supply pipeline. How many new units are delivering in the next 24 months relative to current inventory? Primary markets absorbing 2% new supply per year behave differently from markets facing 5%.
• Regulatory environment. Rent control, just-cause eviction, habitability regimes, and transfer taxes shape landlord economics. California, New York, Oregon, and Minnesota have structural regulatory headwinds not present in the Southeast and Texas.
• Cost of living and migration. Net in-migration from high-cost metros supports sustained demand. Census and IRS migration data are primary sources.

What are common multifamily landmines?

• Deferred maintenance underestimated. Roof, HVAC, plumbing, parking lot, unit interiors. Get a property condition assessment (PCA) and treat the estimates as low.
• Unfunded capex. Many value-add deals run short on renovation budget halfway through. Size capex with a 15-20% contingency.
• Utility under-recovery. Many B/C properties leak value through utility costs absorbed by ownership. RUBS (ratio utility billing) programs recover a portion but are complex to implement.
• Property tax reassessment. Many states reassess at transfer. A purchase that underwrites to current taxes may face a 30-50% tax increase in year one.
• Insurance shock. Coastal, wildfire, and convective-storm exposure has driven insurance premiums 30-100% higher in recent years. Bind insurance before closing.
• Bridge-to-agency refinance risk. A deal purchased on short-term interest-only bridge debt that assumes a 5.5% exit cap and a sub-5% agency refi rate may be in trouble if both of those assumptions move.
• Management transition. Changing property managers post-close is disruptive. Evaluate the current PM and plan the transition before closing.

Frequently asked questions

How many units do I need for commercial multifamily financing?

Five units is the typical threshold. Properties with 4 or fewer units are financed under residential (1-4 unit) programs, including conforming and jumbo loans. Five-plus is commercial — agency debt, CMBS, life company, or portfolio bank.

Can I buy multifamily with a 1031 exchange?

Yes. Multifamily is standard 1031 replacement property. Structure with a QI, follow the 45-day/180-day timeline, ensure your replacement price, equity, and debt all meet or exceed the downleg for full deferral.

What is a good multifamily cap rate?

In 2026, institutional multifamily in primary markets trades at 4.5-5.5% going-in caps. Value-add Class B in secondary markets trades at 5.75-7%. Rural or management-intensive Class C can trade higher. See the cap rates guide.

What's the difference between Class A, B, and C multifamily?

Class A is newer construction (typically under 10 years), premium finishes, amenity-rich, in desirable submarkets. Class B is 15-30 years old, adequate finishes, decent submarkets. Class C is older (30+ years), basic finishes, working-class submarkets. Class assignment is qualitative and varies by market.

How much cash do I need for a multifamily investment?

For direct ownership with agency financing at 75% LTV, you typically need 25-30% of purchase price in equity plus closing costs and reserves. On a $2M purchase, that's $600-700K all-in. DSTs and syndications reduce minimums dramatically (as low as $50-100K).

Should I manage multifamily myself or hire a manager?

For properties under 10-20 units in your local market, self-management is viable if you have the time and operational capacity. For larger properties or out-of-market ownership, professional management (3-5% of revenue) is standard. Underwrite the management cost either way — if you self-manage, you're paying yourself with time.