However, the teams poor play was the least of its troubles. The most obvious problem was Sicks Stadium. The longtime home of the Rainiers, it had once been considered one of the best ballparks in minor league baseball. By the 1960s, however, it was considered far behind the times. While a condition of MLB awarding the Pilots to Seattle was that Sicks had to be expanded to 30,000 seats, only 19,500 seats were ready by Opening Day because of numerous delays. The scoreboard was not even ready until the night before the season opener. By June there were finally 25,000 seats in place.  Water pressure was almost nonexistent after the seventh inning, especially with crowds above 8,000. The Pilots had a total attendance of 677,944 people for the season (an average of 8,268), which was 20th in the 24-team league, finishing above fellow cellar dweller teams like the Cleveland Indians, the Chicago White Sox, the Philadelphia Phillies, and the expansion team San Diego Padres. The other two expansion teams outdrew the Pilots, with the Kansas City Royals having 902,414 attend their games while the Montreal Expos finished 10th in attendance with 1,212,608 attending games. The Pilots average attendance per game was also 20th.  The most attendance for a Pilot home game was 23,657, which was done on August 3, 1969 against the New York Yankees.  The lowest attendance for a Pilot home game was on April 29, 1969 (their 17th game), when a reported 1,954 fans showed up to watch them play the California Angels.  The Pilots lost several hundred thousand dollars their first and only season.  The teams new stadium was slated to be built at the Seattle Center, but a petition by stadium opponents ground the project to a halt. The site was later moved to SoDo, Seattle and became the Kingdome, now occupied by CenturyLink Field.
Question: How many new seats had to be added to Sicks Stadium as of opening day after the Pilots were awarded to Seatlle?
Answer: 10500