Which of the following is NOT a type of commercial property endorsement?

The combined liability endorsement is not classified as a type of commercial property endorsement. Instead, it's related to liability insurance, which deals with the coverage of damages and legal liabilities rather than property damage itself.

On the other hand, the other options are indeed types of commercial property endorsements. The peak season endorsement allows for increased coverage limits during specific times of the year when inventory or value may be at its highest, reflecting the business’s seasonality. The extended coverage endorsement expands protection to include additional perils that are not covered under standard policies, such as vandalism, theft, or certain weather-related events. Scheduled tenant coverage offers protection for specific tenant improvements or personal property within a leased commercial space, tailoring the coverage to the individual needs of the commercial tenant.