[1][5] In the spring of 1972, former baseball scout Isao Uko lobbied for the installation of lights at Miyagi Stadium to allow for night games.

With investments from businesses in the Tōhoku region such as the Kahoku Shimpō, Tohoku Baseball Company was created to help fund the project.

[8] That year, Orions pitcher Soroku Yagisawa threw the stadium's first perfect game on October 10 against the Taiheiyo Club Lions.

Lotte manager Masaichi Kaneda appealed to the crowd on the public address system to let the players finish the game explaining that they were trying their best.

Immediately after relocating to Kawasaki, Lotte continued to hold approximately ten countryside games annually at Miyagi Stadium.

Furthermore, the team was allowed to manage the facility, giving them access to all revenue collected from the sale of all advertising, goods, and concessions within Miyagi Stadium.

An opening ceremony attended by the governor of Miyagi Prefecture Yoshihiro Murai and United States Ambassador John Roos was held before the game.

[31] After the disaster, NPB decided to move the final game of the 2011 All-Star Series from Tokyo Dome to Kleenex Stadium, the second time the Eagles hosted the event in four years.

[15] Initially, Rakuten's announced renovation design revealed that the ballpark's seating capacity was planned to be 23,000 by the start of the 2005 season and 28,000 by the following spring.

[45] Rakuten was cautious about rapidly expanding the stands because of the stadium's location in a public park and Sendai's population of approximately 1 million people, a relatively small market for a baseball franchise in Japan.

Though they were eliminated in the second stage, if Rakuten had won and advanced to the Japan Series, NPB claimed that there would have been a ¥100 million profit difference per game held at Miyagi Stadium compared to the Sapporo Dome.

This loss of profit would have not only affected Rakuten, but also the Central League team they played and NPB, as proceeds from Japan Series attendance are split among the three parties.

[56] These new sections effectively created a "lucky zone" on the field, a Japanese term that describes moving an outfield wall to make hitting home runs easier.

[8] In addition to the new electric inning-by-inning scoring and indicator lights, the new board featured handwritten batting lineups and umpire listings as well as a clock.

[63] The screen was erected to the right of the scoreboard to block the view of residents of an apartment building located behind the stadium's right-center field bleachers.

[64] Six years later, the center-field scoreboard was renovated for a third and final time; it was converted to a Panasonic full-LED video screen capable of displaying additional team and player statistics.

The ride, dubbed the "Eagle Bridge", consisted of two beams suspended 20 m (66 ft) above the ground, one to walk across and another with a swing affixed to the end.

[7] Other than the addition of lights in 1973, the stadium's only other significant renovation was the reconstruction of the stands directly behind home plate to include individual seats in 1984.

The outfield scoreboard installed prior to the 1973 season still displayed team batting lineups via old-fashioned panels with players’ names hand-painted on them.

[14] Renovations to the aging facility were an important part of the selection process when NPB was in talks with Livedoor and Rakuten to form new teams to be based in Miyagi Stadium.

[54] Beyond the left field seating, an 8-metre (26 ft) high mound dubbed "Rakuten Mountain" was created using leftover dirt excavated during construction.

[80] Around the front of the stadium, a large, concrete frame was constructed that expanded the concourses, allowing for restrooms and shops to be upgraded and added.

The baseball field's outfield wings were extended from 91.4 to 101.5 metres (300 to 333 ft), the largest in NPB at the time,[54] and its natural turf was replaced with artificial FieldTurf.

[55] A facility housing the pitchers' bullpens was added on the outside of the stadium along its third base side, allowing fans to watch players warm up.

[43] Upgrades continued in 2009 and 2010 when the sunken backstop seats were enclosed to help create the new "Prestige" section,[44] and the large video board was installed in right field, respectively.

[56] The construction of these seats changed the shape of the outfield and decreased the distances to the wall; both distances down the first and third baselines were reduced from 101.5 to 100.1 metres (333 to 328 ft), and middle left and right fields were shortened from 117 to 116 metres (384 to 381 ft), effectively creating a "lucky zone", the term used to describe moving an outfield wall to make hitting home runs easier.

[35] The following offseason, a new entrance gate and standalone Eagles' merchandise store were built in the plaza in front of the stadium and a geodesic dome was erected on its third base side.

The ¥3 billion project converted the field from artificial turf back to natural grass, updated the scoreboard to a full LED screen, redeveloped the center-left stands into an amusement park, and made minor alterations to several seating sections.

Rakuten first began testing the feasibility of maintaining a natural turf field in Sendai's cold climate by collecting data on grass installed on a practice area next to the stadium in 2014.

[93][94] Near the end of the three-year contract period, all parties agreed to renew for another three years, however the price of the naming rights was lowered to ¥600 million.