3. What important information does the planning board need to approve this

plan?
The solution to this problem should be a compromise that takes into consideration the needs and desires of both sides. Instead of solely turning the vacant lot into either a parking lot or a park, a combination of both should be implemented.

In order to approve this plan, the planning board would need the following important information:

1. Detailed design and layout plans: The planning board would require detailed plans showcasing how the combination of a parking lot and a park would be implemented on the vacant lot. This would include specifics such as the number of parking spaces, the arrangement and layout of the parking lot, and the design and layout of the park area.

2. Environmental impact assessment: The planning board would need an assessment of the environmental impact of the proposed plan. This would include factors such as the effect on soil quality, water drainage, and any potential impact on local wildlife or ecosystems. If any mitigation measures or environmental protection plans are required, these should be outlined in detail.

3. Traffic management and access: Since the plan involves a parking lot, the planning board would need information on how traffic would be managed in the area. This would include aspects such as entrance and exit points to the parking lot, potential traffic flow patterns, and any measures taken to ensure smooth traffic movement and minimize congestion.

4. Cost analysis and funding sources: The planning board would require a comprehensive cost analysis of the proposed plan, including estimates for construction, maintenance, and ongoing expenses. Additionally, details regarding the funding sources for the project should be provided, such as whether it will be funded by the city, private investors, or a combination of both.

5. Public opinion and community engagement: It is crucial to involve the community and obtain public opinion on the proposed plan. The planning board would need to see evidence of community engagement, such as surveys or public meetings, to ensure that the plan has taken into consideration the needs and desires of both sides. Documentation of this community engagement should be provided as part of the approval process.

6. Legal and regulatory compliance: The planning board would need confirmation that the proposed plan complies with all relevant laws, regulations, and zoning requirements. This would include ensuring that the proposed land use is permitted in the area, that any necessary permits or licenses will be obtained, and that the plan aligns with the city's overall development goals and plans.

Overall, the planning board will need sufficient evidence and documentation to assess the feasibility, environmental impact, community involvement, and compliance with regulations before approving the plan for a combination parking lot and park on the vacant lot.