1: Warranty
​# of years and exclusions ​
 for labor and materials
2: Will they install a new roof over the existing one or replace the existing one 
3: How much extra will they charge for wood repair/replacement per sqft if that becomes necessary.Normally they cannot tell this until they
    tear off the existing roof 
4: Verify they have liability insurance 
5: Verify active CSLB roofing license at (the ones on the list should be ok but sometimes they get canceled so it is good to check
6: How long they will take to do the job
7: Confirmation they will remove and dispose of all materials from the job site
8: Install solar panels at the same time. Just an idea. Could help offset cost of AC but benefit to tenant although rent could be raised a bit if this was installed