I am a subcontractor on a housing authority project and the GC won't provide the remaining amount of the subcontract. He has directed me to talk to his attorney and doesn't believe he owes me any money. He also has not submitted or negotiated any change orders on the project that were identified as unforeseen conditions and winter conditions. What are the steps and restrictions in filing the mechanics lien? Can I include the change orders that were submitted and remain outstanding? The work for those are complete.