Lions relocated, activity in the Silverdome dropped drastically; however, it still staged some events. Annually, Jehovah's Witnesses used the Silverdome from the late 1970s to 2004. Due to talk of renovation in 2004, the Witnesses opted to travel to The Dow Event Center in Saginaw, and the SeaGate Convention Centre in Toledo, Ohio for their District Conventions. Between 2003 and 2006, a three-screen drive-in theater operated in the parking lot; this theater reopened in 2010 before closing again on July 13, 2011. The Silverdome hosted Monster Jam on January 7, 2006, and was used as a practice facility for the AFC champion Pittsburgh Steelers for Super Bowl XL, with the NFL adding FieldTurf, which was later donated to a local high school. Sale After the Lions' departure, the city of Pontiac began to experience several years of serious financial problems. Due to the continued high maintenance costs of the structure, it made several unsuccessful attempts to sell the stadium. In early 2008, United Assurance Company Ltd. made the highest purchase offer to date, with a bid of $18 million to convert the Silverdome into a Hollywood-style entertainment complex, following an earlier bid of $12 million by an attorney. However, the city announced in October 2009 that the property would go to auction with no minimum bid, and that zoning regulations would be relaxed for any buyer in order to spark development. The city engaged the firm of Williams & Williams to conduct the auction in November 2009. After reading about the auction in a newspaper, Greek-born Canadian real estate developer Andreas Apostolopoulos, CEO of Toronto-based Triple Properties Inc., submitted a winning bid of US$550,000. Real estate fees of 6% raised the price to US$583,000. The sale of the Silverdome, completed in 1975 at a cost of $55.7 million (approx. $225 million in 2012 dollars) and sold in 2009 for $583,000, was viewed by many as a symbol of the collapse of real estate prices in the Detroit metropolitan area though many local leaders and residents claimed the sale was brought about due to the incompetence of city management and their not having a vision or future plans for the stadium and surrounding area. Reopening (2010–2013) In the March 11, 2010, edition of the Detroit Free Press, Apostolopoulos vowed "to revive the stadium as a big-event venue by investing millions of dollars". The Silverdome re-opened on April 17, 2010, with a