Unless the building permit is obtained by February 1 of this year or some of the other activities necessary for construction of the new library can be completed in less time than originally planned, the new library will not be completed on schedule. It is now clear that the building permit cannot be obtained by February 1, so the new library will not be completed on schedule.
All of the other activities necessary for construction of the library will take at least as much time as originally planned is assumed in order for the conclusion drawn to follow logically from the premises.