Charlotte’s city council voted unanimously Monday night to approve an agreement to provide $87.5 million for upgrades to the team’s 17-year-old stadium in exchange for a commitment to stay in North Carolina’s largest city for at least another six years. The council’s action came on a voice vote. It means the city will contribute $87.5 million in hotel tax and food and beverage tax revenues for renovations to Bank of America Stadium. The first phase of the improvements will include escalators to take fans to the upper deck. The Panthers will also install new video boards and improve the sound system. In addition to the six-year commitment to keep the team in Charlotte, city leaders say there is an additional clause that would make it likely the team will stay at least 10 years.