What Are the Four Types of Multifamily Housing?

Any property with two or more residential units under one roof qualifies as multifamily. A duplex qualifies. So does a 200-unit apartment complex. The differences between those two extremes (in how they're financed, managed, and valued) are enormous.

The four apartment building types below reflect how lenders, operators, and investors actually think about multifamily real estate. The dividing lines aren't arbitrary; they map to real thresholds in lending policy, management economics, and institutional capital flow.

Unit count: Duplex (2), triplex (3), and fourplex (4)

The defining feature of residential multifamily is financing. Properties with 2–4 units qualify for residential mortgages (conventional loans, FHA loans, and VA loans) the same products used to buy single-family homes. A buyer who occupies one unit can access owner-occupied rates and down payments as low as 3.5% with FHA financing.

This accessibility makes residential multifamily the most common starting point for new investors. The house-hacking model: living in one unit while tenants offset or cover the mortgage, is a well-established path to building equity with minimal out-of-pocket carrying cost.

The ceiling: Four units is the limit. Add a fifth unit, and the property is reclassified as commercial by lenders, which means a different loan product, different lender, and typically higher reserves and personal recourse on the debt.

For more on this type, read what a 2-4 unit property is.

Unit count: 5 to 70 units

At 5 units, the property is reclassified as commercial by lenders. Residential mortgages no longer apply. Buyers work with community banks, credit unions, or smaller regional lenders; and loans below $1 million often carry recourse provisions, meaning the borrower is personally liable if the property can't service its debt.

Operationally, small apartment buildings are almost always managed by a third-party off-site property management company rather than the owner. On-site staff typically isn't economical until a property reaches 50+ units.

This is where most professional multifamily investors begin building scale. Compared to duplexes and fourplexes, small apartments offer diversified rental income because a single vacancy doesn't stop cash flow entirely. Compared to large complexes, they carry lower acquisition costs and face less competition from institutional buyers.

EagleCap targets properties in this range as part of a value-add strategy: acquiring communities with below-market rents or deferred maintenance, improving operations, and repositioning the asset to capture higher income and sale value.

Unit count: 70+ units (large complexes often reach 300–500 units)

Large multifamily crosses into institutional financing territory. Properties at this scale qualify for agency debt from Fannie Mae or Freddie Mac, typically offering non-recourse loans at favorable rates that are unavailable to smaller properties. Life insurance companies and CMBS lenders also compete actively for this business.

At 70+ units, on-site management becomes economically justified. A leasing office, maintenance staff, and a full-time resident manager are standard. Professional operating infrastructure that lowers costs per unit through economies of scale.

The net operating income on a large complex is underwritten with institutional precision: lenders apply debt service coverage ratio minimums, and buyers price deals based on cap rates set by institutional comparable sales. For passive investors, large multifamily is the primary asset type accessed through real estate syndications and private funds.

Unit count: Typically 100+ luxury units; often 200–500+ in major urban markets

Luxury high-rise buildings occupy the top of the multifamily capital stack. Found in dense urban cores, these properties command premium rents through amenities like rooftop terraces, concierge services, hotel-quality fitness centers, and covered parking. They are built for the highest end of the rental market.

The barriers to entry are significant. Development costs routinely exceed $100 million for a major-market high-rise. Land costs, entitlement risk, construction complexity, and long lease-up timelines require institutional capital partners or joint ventures between large real estate firms.

For passive investors, high-rise investments typically appear in large institutional funds or non-traded REITs, not the Regulation D private offerings common in smaller apartment syndications. The risk-return profile differs from the value-add model: less operational upside, more reliance on location appreciation and lease-up execution.

Most passive investors access multifamily through a real estate syndication, a structure where a sponsor acquires and operates a property on behalf of a group of investors. The large majority of syndications target large multifamily (70–300+ units), where agency debt, professional management, and value-add execution overlap.

A meaningful share of syndicators focus on the 20–70 unit range, where competition from institutional buyers is lower and per-unit upside is often higher, though financing costs and execution complexity can be greater.

Residential multifamily (2–4 units) is rarely syndicated because deal sizes are too small to justify the capital-raise process. Luxury high-rise falls outside most passive investor vehicles, the capital structure is simply not designed for individual accredited investors placing $50,000–$250,000 minimums.

For accredited investors seeking passive income and portfolio diversification, the small-to-large apartment range (20–300 units) offers the best combination of access, professional management, and value-add potential.

Related guides: apartment classes A, B, C and D explained, what to ask before joining a syndication, investing in real estate with an IRA, multifamily real estate investing and how to buy your first apartment complex.