Which of these is not typically considered part of ancillary revenue?

Ancillary revenue refers to income generated from services that support the primary business model without being part of the core operational revenue. In the context of real estate finance or data centers, this typically includes additional services that enhance the main offering.

Property insurance costs are considered a necessary operational expense rather than a source of additional revenue. Insurance is a standard cost that property owners incur to protect their assets, and it does not generate income. Instead, it is a prerequisite for conducting business and safeguarding the investment.

On the other hand, backup storage services, cross-connect fees, and cooling services for servers all represent additional services that a business may provide. These can enhance customer satisfaction or operational efficiency and generate additional income beyond the primary revenue stream. Thus, while the first three options contribute to ancillary revenue, property insurance costs do not, making it the correct choice in this context.