In this case, the street office needs to perform duties such as supervision and audit, coordination and communication, and publicity.

1. supervision and audit: the street should supervise the application and approval process of large maintenance funds used by property companies to ensure compliance with relevant regulations and procedures and the rationality and necessity of the use of funds.

2. Coordination and communication: The street should actively coordinate the relationship between the property management company and the owner, promote communication between the two parties, and ensure the smooth maintenance work.

3. Publicity: The street should urge the property management company to publicize the use of the maintenance fund to the owners to ensure the owners' right to know and supervise.