To open a virtual office in Singapore, your company must meet a few key requirements. Firstly, your business needs to be registered with the Accounting and Corporate Regulatory Authority (ACRA) using a physical office address in Singapore. This address must be available for receiving important government communications and mail. Additionally, the company should operate for at least five hours daily to ensure accessibility for mail or other communications. A comprehensive business plan outlining your operational and resource strategy is also necessary when registering your business with ACRA.