Multifamily investment covers a wider range of property than the term usually implies, everything from a duplex or fourplex financed like a residential purchase to a 200-unit garden apartment complex underwritten like a business. The financing, management demands, and buyer pool change substantially as unit count climbs, which means the right entry point depends heavily on the capital and time an investor actually has available.
The Line at Five Units
Properties with two to four units generally qualify for residential financing, meaning an owner-occupant or investor can use conventional or FHA-type loan terms with lower down payments than commercial lending requires. At five units, a property crosses into commercial financing territory: the loan gets underwritten against the property's income, down payments run higher, and terms are typically shorter with a balloon or refinance point rather than a 30-year fixed structure. That line at five units is one of the more consequential facts in multifamily investing, and it drives a lot of the small-investor strategy of starting with a duplex or fourplex before moving up.
South Carolina's Rental Demand Isn't Uniform
Population growth in South Carolina has been concentrated in specific corridors, the Charleston metro, the Greenville-Spartanburg Upstate, and the I-77 corridor around Rock Hill and Fort Mill, and rental demand has followed that growth closely. Slower-growing counties away from those corridors can still offer multifamily opportunity, but usually on a value basis, lower purchase price and higher going-in yield, rather than on strong rent growth. Knowing which kind of return an investor is underwriting for, growth or yield, should come before picking a specific submarket.
What Changes as Unit Count Grows
A ten-unit property and a hundred-unit property both fall under the multifamily label, but they operate on different management models. Smaller multifamily properties are frequently self-managed or run by a small local company, while larger properties typically justify on-site staff and professional management, an added expense line that has to be underwritten into the return rather than treated as a rounding error. Larger properties also tend to trade on more standardized commercial underwriting, with buyers comparing cap rates and per-unit pricing more directly than smaller deals, which are often priced more on the seller's asking number.
Deferred maintenance is a bigger risk at scale simply because the dollar amounts are bigger; a roof or parking lot replacement on a 150-unit property can run into seven figures, which is why larger multifamily deals lean more heavily on third-party property condition assessments before closing than a duplex purchase typically does.
1031 Exchanges Across the Size Spectrum
Multifamily property at any size, from a duplex to a large apartment complex, qualifies as like-kind for a 1031 exchange as long as it's held for investment rather than personal use. That flexibility lets a South Carolina investor exchange a self-managed fourplex into a larger, professionally managed complex, or the reverse, downsizing from a large complex into a handful of smaller properties, without breaking the exchange's like-kind requirement. What matters for deferral is timing, 45 days to identify and 180 to close, and reinvesting the full net proceeds and debt from the relinquished property.
An investor moving from a smaller, self-managed property into a larger one through an exchange should underwrite the new management burden honestly rather than assume it scales the same way. A larger complex generally means either hiring a property management company, an added expense that reduces net income, or bringing on-site staff, a step that changes the investment from a passive rental into something closer to running a small business, even though the tax treatment on both sides of the exchange is the same.
Frequently Asked Questions
At what unit count does multifamily financing become commercial?
Properties with five or more units are financed as commercial real estate, underwritten against the property's income, while two-to-four unit properties can typically use residential-style loan terms.
Is a duplex a good way to start multifamily investing?
It can be, since duplexes and fourplexes qualify for residential-style financing with lower down payments, giving new investors a lower-capital entry point before moving to larger commercial properties.
Do South Carolina multifamily markets all perform the same?
No, rental demand and rent growth are concentrated in growth corridors like Charleston, the Upstate, and the I-77 corridor, while other areas offer more value-oriented pricing with slower rent growth.
Can I 1031 exchange a small multifamily property into a larger one?
Yes, multifamily property of any size held for investment qualifies as like-kind, so exchanging from a smaller property into a larger complex is allowed under the 1031 rules.
Why does deferred maintenance matter more on larger multifamily deals?
Major repairs like roofs or parking lots cost more in absolute dollars at scale, which is why larger multifamily purchases typically involve a formal property condition assessment before closing.