1989 is relatively new. Most serious problems that might require you to tear down walls in order to fix them (asbestos, steel plumbing, no ground wire in electrical outlets) are only present in houses older than 1970 or so. In a 1989 house, major risks include inadequate insulation, 20-year-old appliances, slightly off-vertical walls (not enough to be seen with a naked eye, but enough to make any attempt to install new doors or crown moldings a serious PITA).
