The Dayton Dragons (Class A; Midwest League) could be playing at Day Air Ballpark through 2060, as the team and the city agreed on three ten-year options kicking in when the current lease ends in 2030.
When the extensions kick in for the 2031 season, the Dragons will be paying $10,000 per year in rent. Since the ballpark opened 20 years ago, the team says it has spent $23 million in various improvements. In addition, the Dragons secured an option to buy the ballpark as part of the new deal; that option runs through 2031. From the Dayton Daily News: