What Is Apartment Building?
Apartment buildings are multifamily properties with 5+ units. They cross the threshold from residential loan to commercial loan territory—underwritten on NOI and DSCR, not personal income. They range from small five-plus-units (5–20 units) to mid-rise and high-rise. Unit mix, common areas, cost per door, and cap rate drive valuation. Larger buildings typically have more common areas, ancillary income potential, and economies of scale.
An apartment building is a multifamily property with multiple rental units—typically 5 or more—financed with commercial loans, valued by cap rate and NOI, and managed with professional property management systems.
At a Glance
- What it is: Multifamily property with 5+ units; commercial financing
- Why it matters: Different financing, valuation, and management than two-to-four-units
- Key detail: Commercial loans use NOI and DSCR; no FHA/conventional residential
- Related: Five-plus units, two-to-four units, commercial loan, common areas, unit mix
- Watch for: Operating expenses and common areas scale with size
How It Works
Financing. Two-to-four-units qualify for residential loans. At 5 units, you move to commercial loans—shorter terms (5–25 years), DSCR underwriting, and often balloon payments. Multifamily financing for apartment buildings is widely available from banks, agencies (Fannie, Freddie), and CMBS lenders.
Valuation. Cap rate = NOI ÷ value. NOI comes from rent, ancillary income (laundry income, parking income), minus operating expenses. Cost per door and per-unit analysis support comparison across buildings.
Management. Larger apartment buildings usually need professional property management—leasing, maintenance, common areas, and compliance. Two-to-four-units can be self-managed; 20+ units typically require a manager or management company.
Real-World Example
Parkview Apartments, Atlanta. A 24-unit apartment building built in 1995—garden apartment style with common areas (lobby, laundry, courtyard). Purchased for $2.16M ($90,000/door). NOI was $118,000. Operating expenses included $18,000 for common areas (cleaning, landscaping, lighting). The owner added laundry income ($3,200/year) and parking income ($2,400/year), raised rents 4% on renewals, and reduced turnover with better tenant mix screening. NOI grew to $132,000. At a 5.5% exit cap, value increased from $2.15M to $2.4M—a 11% gain in 18 months.
Pros & Cons
- Scale: more units = more income diversification
- Commercial loans available; DSCR underwriting
- Ancillary income from laundry, parking, storage
- Professional property management systems and economies of scale
- Commercial loan terms: shorter, higher rates, balloon risk
- Common areas and operating expenses scale up
- One vacancy is a smaller % of income, but absolute dollar impact is larger
Watch Out
- Expense verification: Sellers often understate operating expenses; verify with actuals and expense ratio benchmarks.
- Cap rate compression: Don’t assume cap rates hold; model exit at higher caps.
- Management transition: Changing managers can disrupt operations; plan for continuity.
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The Takeaway
Apartment buildings are the core of institutional and scaled multifamily investing. Commercial financing, cap rate valuation, and per-unit analysis apply. Factor common areas and operating expenses carefully in multifamily due diligence.