1. Tenant vacancies: Commercial properties can experience vacancies, which can reduce rental income and increase expenses.
2. Maintenance and repair costs: Commercial properties require regular maintenance and repair costs, which can be significant.
3. Regulatory compliance: Commercial properties must comply with a range of regulations, including zoning laws, building codes, and environmental regulations.

Overall, commercial real estate can be a valuable addition to an investment portfolio, but it requires careful consideration of the risks and challenges involved.