Background In early 2016, the
Hokkaido Nippon-Ham Fighters, a
Nippon Professional Baseball (NPB) team, began considering constructing a new stadium in or around
Sapporo. Since first relocating to Sapporo from
Tokyo in 2004, the Fighters played their home games in
Sapporo Dome, a
multi-purpose stadium. Instead of being owned and operated by the team, the facility was owned by the city of Sapporo and operated and managed by Sapporo Dome Co., Ltd., a
voluntary sector company funded by the city and its community. At the time, the dome was charging the Fighters approximately
¥16 million (about $108,000) per game to play at the facility in front of a capacity crowd; annually, the team was spending around ¥1.3 billion (about $8.8 million) to play there. Additionally,
Nippon Ham did not make any money on concessions or advertising in the stadium during their games. The high rental fees, loss of in-stadium sales revenue, and inflexibility of a multi-purpose facility all contributed to Nippon Ham's decision to explore building their own stadium. in
Sapporo was proposed as a site for the Fighters' new ballpark. NPB set up a task force in collaboration with Nippon Ham in December 2016 to advance the new stadium project and develop a firm plan by March 2018. The mayor of Kitahiroshima met team representatives to propose its sports park concept. It offered up 20 of the 36 hectares at its "Kitahiroshima Sports Park" site for a natural grass,
retractable roof baseball stadium capable of seating 30,000 people. Additionally, the site could be home to an indoor practice field, training facilities, and commercial space. Initially, Sapporo appealed to the team to continue playing at Sapporo Dome, even offering to make the facility a baseball-only stadium. After Nippon Ham continued to pursue new construction and with Kitahiroshima quickly offering up a plan, however, the city looked for suitable sites for a new stadium to avoid the prospect of the team leaving. Four months later, Sapporo offered up two locations: 10 hectares at Hokkaido University and 13 hectares
Toyohira-ku; both sites, however, were quickly deemed unusable due to various circumstances. With the Kitahiroshima negotiations progressing, Sapporo offered a third site by the end of 2017—
Makomanai Park. The city proposed redevelopeding 20 hectares of the park into a baseball campus that included restaurants and commercial facilities with the new stadium being built in place of the park's aging
Makomanai Open Stadium after its proposed demolition. As planned, a decision was made the following March with Kitahiroshima's Sports Park site being chosen as the home of the Fighters' new ballpark. Furthermore, Kitahiroshima's larger, 36-hectares location provided more space to construct the stadium and its planned surrounding facilities. Nippon Ham revealed the basic stadium design and further details later that year. Owned and operated by Nippon Ham, the ballpark was designed by
Obayashi and architecture firm
HKS, the architect of Globe Life Field, and its construction was estimated to cost ¥60 billion ($530 million in 2018). In January 2020, real estate company ES-Con Japan acquired the naming rights to the stadium. A ground breaking ceremony for the stadium was held on April 13, 2020, and construction started on May 1. The stands and roof were built concurrently to speed up the construction schedule; the roof sections were assembled and installed on the stadium later from the outside. Workers had to contend with heavy snowfall during the winter months. A total of 650,000 people worked on the project up until its completion on January 4, 2023; a completion ceremony was held the following day. With the stadium planned to be operational for the 2023 NPB season, the Fighters hoped to host
opening day at their new facility. The team scheduled to hold the opening day game that year, the
Tohoku Rakuten Golden Eagles, agreed to transfer the game to Nippon Ham after a year of negotiations. The ballpark's first game was a preseason match on March 14, 2023; its first official game was held on March 30. ==Design and features==