If all goes according to plan, the ABBA musical Mamma Mia will begin an open-ended run in the theater when the opera moves out. The Oslo daily Aftenposten reports that real estate developer Christian Ringnes, who purchased the building from the city government last year, has signed a lease with the Swedish entertainment company Ema Telstar, which runs a Stockholm theater complex where Mamma Mia has been running for two years. The firm hopes to reopen the Folketeaterbygningen with the popular musical and also to open a large restaurant at the site.