Sun Belt Migration and CAM: How Population Growth Is Changing Operating Expenses
The Migration Numbers
Between 2020 and 2026, Sun Belt metros absorbed the majority of U.S. domestic migration. The Census Bureau and state demographers report net inflows that have reshaped demand for commercial space:
| Metro | Net Migration 2020-2025 | Key Corporate Relocations |
|---|---|---|
| Phoenix | 470,000+ | Taiwan Semiconductor, numerous tech firms |
| Dallas-Fort Worth | 520,000+ | Goldman Sachs, Charles Schwab, Caterpillar |
| Houston | 380,000+ | HPE, various energy companies |
| Austin | 270,000+ | Tesla, Oracle, Samsung expansion |
| Nashville | 280,000+ | Amazon, Oracle, AllianceBernstein |
| Tampa | 260,000+ | Financial services migration |
| Charlotte | 210,000+ | Centene, various fintech |
| Raleigh | 180,000+ | Apple campus, life sciences |
This growth drives commercial leasing activity, which drives property values, which drives operating expense inflation. The chain is predictable. The speed varies by metro.
Three Cost Categories Under Pressure
1. Property Tax Assessments
Property tax is the largest single operating expense category in most CAM reconciliations (25-40% of total OpEx). Sun Belt assessors are working with fresh comparable sales data from a high-volume transaction market.
| Metro | 2025-2026 Assessment Trend | Primary Driver |
|---|---|---|
| Phoenix (Maricopa) | +9-13% | Full cash value reappraisal, strong comps |
| DFW (Tarrant/Dallas) | +8-12% | Annual reappraisal, industrial transaction volume |
| Nashville (Davidson) | +12-16% | Reappraisal cycle, rapid appreciation |
| Austin (Travis) | +6-10% | Moderated from 2022-2023 peaks |
| Miami (Dade) | +8-11% | Tourist/luxury market comps affecting commercial |
| Charlotte (Mecklenburg) | +10-14% | Revaluation year, strong office/industrial comps |
For a 150,000 SF office building with a $1.2M tax bill, a 12% increase adds $144,000 to the operating expense pool. That's nearly $1.00/SF in additional CAM charges distributed across tenants.
Controller action: File protests in jurisdictions where the increase exceeds 8-10%. Sun Belt protest success rates are 40-60% for commercial properties with well-documented appeals. Even a partial reduction saves tenants real money and builds trust.
2. Insurance Premiums
Sun Belt insurance markets are under severe pressure from natural catastrophe exposure. Hurricane risk (Florida, Gulf Coast), hail damage (Texas), wildfire proximity (parts of Arizona, California overlap), and flood exposure are driving premium increases that far exceed general inflation.
| Metro | Insurance Trend | Primary Risk Factor |
|---|---|---|
| Miami/Tampa | +25-35% annually | Hurricane, flood |
| Houston | +15-25% annually | Hurricane, hail, flood |
| DFW | +12-20% annually | Hail, tornado |
| Phoenix | +10-15% annually | Roof replacement cost inflation |
| Nashville | +8-12% annually | Severe storms, tornado proximity |
| Charlotte/Raleigh | +8-12% annually | Hurricane remnant events |
Insurance is a fixed expense that passes through at actuals. It should never be grossed up. But as premiums rise, insurance becomes a larger share of total OpEx, and the absolute dollar impact on tenant statements grows.
A $200,000 insurance premium increasing to $260,000 (30% in Miami) adds $60,000 to CAM. For a tenant with 10% pro-rata share: $6,000 additional annual charge from insurance alone.
Controller action: Communicate insurance renewals to tenants within 30 days. Include the renewal declaration showing the new premium. Tenants who understand market conditions accept increases. Tenants who are surprised dispute them.
3. Service Labor Costs
Janitorial, security, landscaping, and maintenance labor costs follow local wage inflation. Sun Belt metros with rapid job growth are seeing service worker wages rise 5-8% annually as commercial buildings compete for limited labor pools.
This affects every building services contract. The janitorial vendor who bid $3.50/SF in 2022 is rebidding at $4.25/SF in 2026. The security company increases its hourly rate from $22 to $26. Landscaping crews are harder to staff, pushing contract prices up.
Unlike taxes and insurance, these costs are controllable and variable. They're subject to gross-up at vacancy. And because they're vendor-negotiated, the landlord has some ability to manage them through competitive bidding and contract negotiation.
Controller action: When service contracts renew at higher rates, document the competitive bidding process. Tenant auditors frequently question above-market service costs. Having three bids on file for every major service contract defends against this finding.
Reconciliation Implications
Estimate accuracy suffers in high-inflation markets. If operating expenses are growing 8-12% annually and you set estimates based on last year's actuals, you're under-estimating by 8-12%. Large year-end true-ups follow. Adjust estimates quarterly in high-growth metros.
Year-over-year variance explanations are mandatory. A tenant in Nashville seeing 14% total CAM growth will ask questions. Have the answer ready: property tax reassessment (X%), insurance renewal (Y%), service contract renewals (Z%).
Base year leases amplify the problem. A tenant who signed a base year lease in 2021 (low insurance, pre-reassessment) is now seeing the full force of Sun Belt cost inflation in their incremental charges. By 2026, the gap between base year and current expenses can be $3-5/SF — and growing.
Cap provisions bind earlier. In a 5% cap environment with 10% actual expense growth, caps bind immediately and create landlord absorption. Understand which tenants have caps and model the absorption cost.
Related Resources
- DFW Industrial CAM — Texas market deep dive
- Houston Office CAM in High Vacancy — Gulf Coast specifics
- 2026 Property Tax Increases — National assessment trends
- Insurance Expense Pass-Throughs — Premium allocation methodology