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.
Evidence
Unless the building permit LC → OP or OALT 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 ~OP building permit cannot be obtained by February 1.
Conclusion
So the new library will ~LC not be completed on schedule.
Evaluate
The argument assumes ~OALT that the other activities necessary for construction of the new library cannot be completed in less time.