Requirements first
Seats alone are not enough; power, network, privacy, specialized equipment and proximity to staff may matter.
Activation time
A site that takes several days to prepare cannot support a four-hour recovery objective.
Shared disaster risk
An alternate location should not depend on exactly the same local utilities, transport routes or access constraints when geographic separation is the purpose.
Maintenance
Access rights, equipment and contact information should be periodically checked.
Business continuity is organization-specific. Recovery priorities, legal duties, safety requirements, contracts, insurance terms and technical recovery methods should be validated by the responsible people in the organization.