South Carolina's coastal resort markets — Hilton Head, Myrtle Beach, Charleston-area beaches — operate with some of the highest STR occupancy levels in the country. The financial, governance, and capital-planning implications differ from the typical owner-occupied analysis in ways that the casual review of documents may miss. For a buyer planning to live in the unit or use it as a primary vacation home, the investor and STR mix shapes long-term outcomes substantially.

How STR concentration shapes the financial picture

Heavily-rented buildings show predictable patterns:

• Higher delinquency rates, because investors who lose tenants or face cash-flow pressure miss assessments more often than owner-occupants
• Higher master-policy claim activity, driven by tenant-caused incidents
• Larger and more frequent capital programs, because corridor finishes, elevators, pool areas, and amenity programs wear faster with high turnover
• Underwriting pressure at master-policy renewal, with carriers asking about occupancy mix
• Mortgage-eligibility constraints, because Fannie Mae caps STR/investor concentration

The Fannie Mae rules in particular are consequential. For established condo projects, conventional financing generally requires:

• More than 50 percent owner-occupancy
• No single investor owning more than 20 percent of units

Buildings that cross those lines become ineligible for conventional Fannie Mae loans, which:

• Narrows the buyer pool for any unit (and your unit when you resell)
• Forces buyers into portfolio, FHA, or VA loans where eligible
• Depresses unit prices relative to owner-occupied buildings
• Complicates the financing of any new purchase

Reading the documents for the STR signal

Several specific things to ask for and read:

The owner-occupancy ratio. Not statutorily disclosed in South Carolina. Request from the management company. Compare against Fannie Mae thresholds.

The STR or long-term-rental rate within the building. Often known to the management company or the seller's listing agent. Important for reserve adequacy assessment.

The declaration's leasing language. Some declarations restrict or ban STRs; many permit them. Read for any amendment threshold that would allow or restrict rentals.

Board minutes for rental-policy discussions. Heavily-investor buildings often see periodic attempts to amend rental rules. Recent or pending amendment activity reveals where the community is heading.

Local STR ordinance applicability. Hilton Head, Myrtle Beach, and Charleston have meaningfully different STR ordinances. Verify which applies and what permit requirements exist.

The reserve study's wear assumptions. Most professional reserve studies make assumptions about common-area usage that drive useful-life estimates. Studies modeling owner-occupied use materially understate capital trajectory in heavily-rented buildings.

The governance dimension

South Carolina has no state HOA ombudsman and no statutory open-meeting requirement for boards. Heavily-investor-owned buildings often show governance patterns worth watching:

• Absentee board composition. Boards dominated by investors who do not live on-site may make different decisions about amenities, fines, and rental rules than resident-dominated boards.
• Disengaged owner-comment participation. A consistent absence of substantive owner comments in minutes can reflect a disengaged community.
• Rental-policy churn. Periodic attempts to tighten or loosen rental restrictions reveal tension between investor and owner-occupant blocs.
• Inconsistent STR enforcement. Heavily-STR buildings often face fine and enforcement disputes that surface in minutes.

Read 18–24 months of board and annual meeting minutes. For Hilton Head and Charleston buildings specifically, also look for any historic-district or BAR-related compliance discussion alongside the standard governance review.

Insurance considerations

S.C. Code §27-31-240 requires associations to insure common property against risks but does not regulate the structure. In heavily-rented coastal buildings, master-policy underwriting reflects:

• Higher liability exposure from tenant turnover and incidents
• Higher claim activity (small water losses, theft, vandalism)
• SCWHUA wind placements increasingly common
• Hurricane and storm-surge exposure as for any coastal building

For your own HO-6:

• Confirm the master policy's coverage type (all-in vs. bare-walls)
• Size your loss-assessment limit against realistic exposure
• If you plan to rent, discuss landlord-vs.-resident coverage with your agent
• Verify contents and loss-of-use coverage account for short-term-rental wear if applicable

Hilton Head, Myrtle Beach, Charleston — distinct dynamics

Each market has its own STR rhythm:

• Hilton Head: Premium vacation market with significant institutional STR operators. Many associations have layered rules over the years. BAR-style architectural review in some communities. Reserve adequacy varies widely.
• Myrtle Beach: Volume-driven STR market with many 1980s–2000s oceanfront mid-rises operating at high STR occupancy. Master-policy underwriting and reserve adequacy are the bigger questions than rule enforcement.
• Charleston peninsula and beaches: Smaller-volume STR market with stricter local ordinance overlays. Historic-district BAR review affects exterior capital work. Owner-occupancy ratios are often higher than Myrtle Beach.

What CondoSignal surfaces

We pull the available STR-related signals — owner-occupancy disclosures when produced, delinquency rate, reserve study assumptions, master-policy underwriting questions, STR-related minutes activity, and the loan-eligibility implications of the concentration — into a single state-specific risk summary. We flag projects that may be ineligible for conventional financing, associations with reserve assumptions out of step with actual usage, and patterns of board behavior that suggest absentee governance. The goal is to help a buyer make an informed decision about a market in which the unit's investment characteristics and the building's operational characteristics are tightly coupled in ways the listing does not reveal.