A multilingual private school in Denver’s Lowry neighborhood is under contract to buy a nearby Catholic school’s building when it closes next year. International School of Denver, which serves pre-K through the eighth grade, said the purchase of the Bishop Machebeuf High School property will allow it to add grades nine through 12. Both sides of the pending deal disclosed it in separate press releases on Friday. The archdiocese announced in September that Bishop Machebeuf, at 458 Uinta Way, would combine with St.