The intelligent upgrade of the Hailian parking lot system in the office building can improve the convenience and safety of the parking lot, bringing better experience and efficiency to car owners and parking lot managers. Here are some intelligent choices that can be considered:

1. License plate recognition system: By installing license plate recognition cameras, automatic recognition of license plate information can be achieved without manual input, improving entry and exit speed and reducing waiting time in queues.

2. Electronic payment system: Provides multiple payment methods, such as mobile payment, card payment, etc., to facilitate car owners to pay parking fees and reduce security risks caused by cash flow.

3. Real time parking space monitoring system: Monitoring the usage of parking spaces through sensors and cameras, updating parking space information in real time, helping car owners quickly find available parking spaces, and improving parking efficiency.

4. Remote reservation system: Car owners can reserve parking spaces in advance through mobile apps or websites, avoiding the situation of not being able to find suitable parking spaces after arriving at the parking lot and improving the convenience of parking.

5. Safety monitoring system: Install monitoring cameras and alarm devices to monitor the safety situation in the parking lot in real time, detect abnormal situations in a timely manner, and take measures to ensure the safety of the parking lot.

6. Intelligent navigation system: Display real-time parking space information and parking routes in the parking lot through a mobile app or navigation screen, provide car owners with navigation services, and reduce the time and energy spent searching for parking spaces.