Refundable exemption provision for construction material for certain research and development campuses

This bill creates a refundable sales tax exemption for construction materials used in qualifying research and development campuses in Minnesota. It applies to campuses with at least 250,000 square feet of lab space and $200 million in construction costs within 32 months. The exemption allows developers to pay the tax upfront and then receive a refund, similar to other existing tax exemptions for specific projects. It directly affects developers and owners of qualifying R&D campuses, primarily benefiting large-scale research facilities. The exemption expires March 1, 2028, and applies to sales after June 30, 2025.